ORCID Profile
0000-0001-5720-6649
Current Organisation
RMIT University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Structural Engineering | Structural Engineering | Cad/Cam Systems | Numerical Modelling and Mechanical Characterisation | Interdisciplinary Engineering | Mechanical Engineering | Construction Engineering | Construction Materials | Interdisciplinary Engineering Not Elsewhere Classified | Architecture | Design Practice and Management | Information Systems Management | Research, Science And Technology Policy | Mechanical Engineering | Design Innovation | Fluidization And Fluid Mechanics | Mechanisms Of Reactions | Functional Materials | Nanotechnology | Manufacturing Processes and Technologies (excl. Textiles) | Materials Engineering | Metals and Alloy Materials | Decision Support And Group Support Systems | Biomaterials | Civil Engineering Not Elsewhere Classified | Nanomanufacturing | Building Science And Techniques | Risk Engineering (excl. Earthquake Engineering) | Materials Engineering Not Elsewhere Classified | Aerospace Structures |
ANZSRC Socio-Economic Objective (SEO)
Civil Construction Design | Civil | Structural Metal Products | Metals (e.g. Composites, Coatings, Bonding) | Expanding Knowledge in Engineering | Other | Industry | Other | Housing | Industrial | Technological and organisational innovation | Polymeric Materials (e.g. Paints) | Cement and Concrete Materials | Structural metal products | Expanding Knowledge in Technology | Civil | Commercial Construction Design | Industrial Construction Design | Civil Construction Processes | Natural Hazards in Urban and Industrial Environments | Other | Materials performance and processes | Mining machinery and equipment | Road safety | Rail transport | Rail equipment | Aerospace equipment | Fabricated Metal Products not elsewhere classified | Management of Solid Waste from Construction Activities | Environmentally Sustainable Energy Activities not elsewhere classified | Other | Metals (composites, coatings, bonding, etc.) | Expanding Knowledge in the Medical and Health Sciences | Computer software and services not elsewhere classified | Cement and concrete materials | Electricity, gas and water services and utilities
Related Links
Publications
Shape and topology design for heat conduction by Evolutionary Structural Optimization
Publisher: Elsevier BV
Date: 09-1999
Perimeter control in the bidirectional evolutionary optimization method
Publisher: Springer Science and Business Media LLC
Date: 12-2003
Smoothing topology optimization results using pre-built lookup tables
Publisher: Elsevier BV
Date: 11-2022
Optimum design of frames with multiple constraints using an evolutionary method
Publisher: Elsevier BV
Date: 02-2000
Evolutionary structural topology optimization for continuum structures with structural size and topology variables
Publisher: SAGE Publications
Date: 12-2007
DOI: 10.1260/136943307783571517
Abstract: In this paper, a topology optimization method mixed structures with continuum and discrete elements is proposed. First, based on the stress and displacement formulations of the finite element analysis, a set of stress sensitivity numbers for beam and plane-stress structures are derived. Then, relative difference quotients for topology and size variables of mixed continuum structures with several different types of components are formulated. The optimization criteria, which incorporate the element stress level and relative different quotients, are developed for the topology optimization of continuum domains and the sizing optimization of discrete elements. A new optimization procedure based on the bi-directional evolutionary structural optimization method is proposed. Two ex les are provided to demonstrate the validity and effectiveness of the proposed method.
A finite-element approach to evaluating the size effects of complex nanostructures
Publisher: The Royal Society
Date: 12-2016
DOI: 10.1098/RSOS.160625
Abstract: The size effects that reveal the dramatic changes of mechanical behaviour at nanoscales have traditionally been analysed for regular beam systems. Here, the method of using finite-element analysis is explored with the intention of evaluating the size effects for complex nanostructures. The surface elasticity theory and generalized Young–Laplace equation are integrated into a beam element to account for the size effects in classical Euler–Bernoulli and Timoshenko beam theories. Computational results match well with the theoretical predictions on the size effect for a cantilever beam and a cubic unit cell containing 24 horizontal/vertical ligaments. For a simply supported nanowire, it is found that the results are very close to the experimental data. With the assumption that nanoporous gold is composed of many randomly connected beams, for the first time, the size effect of such a complex structure is numerically determined.
On the accuracy of time‐stepping schemes for dynamic problems with negative stiffness
Publisher: Wiley
Date: 02-1993
Evolutionary topology optimization for natural frequency maximization problems considering acoustic-structure interaction
Publisher: Elsevier BV
Date: 11-2015
Topology optimization of periodic structures for coupled acoustic-structure systems
Publisher: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece
Date: 2016
Cost management in project alliancing: An exploratory investigation
Publisher: Trans Tech Publications, Ltd.
Date: 05-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.174-177.2893
Abstract: This study aims to explore cost management strategies and supporting techniques used in project alliancing. Survey results show that cost management in project alliancing has most features of target costing. More importantly, it was found that cost management in project alliancing, supported by a sophisticated risk/reward arrangement, aligns contracting parties’ interests toward the achievement of owner’s project objectives and links contracting parties’ financial pain/gain with both cost and non-cost areas of performance.
Evolutionary shape optimization for stress minimization
Publisher: Elsevier BV
Date: 11-1999
Controlling the maximum first principal stress in topology optimization
Publisher: Springer Science and Business Media LLC
Date: 13-08-2021
An evolutionary approach to elastic contact optimization of frame structures
Publisher: Elsevier BV
Date: 11-2003
Nonlinear topology optimization design and gripping tests of a novel origami chomper-based flexible gripper
Publisher: Research Square Platform LLC
Date: 17-01-2023
DOI: 10.21203/RS.3.RS-2469905/V1
Abstract: Although the flexible origami gripper can handle a wide range of objects, there is a need for significant further improvement in its gripping performance. This study develops a novel nonlinear topology optimization (NTO) method to enhance the gripping performance of an origami chomper-based flexible gripper. The proposed NTO method incorporates the additive hyperelasticity technique and multi-resolution design (MRD) strategy with the advantages of being computationally efficient, having excellent convergence, and enabling refined design. The effectiveness of the proposed NTO method is validated by two compliant mechanism benchmark ex les, i.e., the displacement inverter and gripper mechanisms. We apply the NTO method to the origami chomper-based flexible gripper to redistribute the material at the creases to obtain the optimized origami chomper-based flexible gripper. Several optimized origami chomper-based flexible gripper prototypes are fabricated by using laser cutter, followed by a series of experiments to test the gripping performances, including gripping range capability under an identical input load, maximum gripping ratio, gripping adaptability, and achieving richer gripping characteristics by size scaling. Results demonstrate that the optimized origami chomper-based flexible gripper can handle a wide range of objects irregularities in textures and uneven shapes and the gripping range capability can be significantly enhanced by the NTO method. We also show that the optimized origami chomper-based flexible gripper can enable effective gripping of objects across scales from millimeters to centimeters to decimeters through size scaling.
An evolutionary shape optimization procedure for contact problems in mechanical designs
Publisher: SAGE Publications
Date: 04-2003
DOI: 10.1243/095440603321509711
Abstract: The finite element method (FEM) has been extensively applied to explore contact stress distributions in multi-body mechanical systems. Uneven contact stresses are often one of the main concerns of mechanical design engineers. By adopting the evolutionary structural optimization (ESO) concepts, this paper presents a non-gradient procedure for gradual shape redesign of prescribed contact interfaces. In this method, interfacial gaps are considered as design variables and contact stress deviations over design interfaces are set as the objective function. To deal with multiple contact region problems, two different design objectives, namely an in idual criteria and a unified criteria, are formulated respectively. Several practical ex les show that this method is effective for design problems consisting of single- or multiple-contact regions in mechanical systems, in which a uniform contact stress pattern is the desired optimality criterion.
Reducing the number of different members in truss layout optimization
Publisher: Springer Science and Business Media LLC
Date: 22-02-2023
DOI: 10.1007/S00158-023-03514-Y
Abstract: Despite the long history of the truss layout optimization approach, its practical applications have been limited, partly due to high manufacturing costs associated with complex optimized structures consisting of members with different cross-sectional areas and member lengths. To address this issue, this study considers optimizing truss structures comprising limited types of members. On this topic, two distinct problems are considered, wherein the first problem, members of the same type share the same cross-sectional area (i.e., section-type problem) and in the second problem, members of the same type share the same cross-sectional area and length (i.e., member-type problem). A novel post-processing approach is proposed to tackle the target problems. In this approach, the optimized structures from the traditional layout and geometry optimization approaches are used as the starting points, members of which are then separated into groups by the k-means clustering approach. Subsequently, the clustered structures are geometrically optimized to reduce the area and length deviations (i.e., the differences between member area/length values and the corresponding cluster means). Several 2D and 3D ex les are presented to demonstrate the capability of the proposed approaches. For the section-type problem, the area deviations can be reduced to near 0 for any given cluster number. The member-type problem is relatively more complex, but by providing more clusters, the maximum length deviation can be reduced below the target thresholds. Through the proposed clustering approach, the number of different members in the optimized trusses can be substantially decreased, thereby significantly reducing manufacturing costs.
Mechanical Properties of Additively Manufactured Thermoplastic Polyurethane (TPU) Material Affected by Various Processing Parameters
Publisher: MDPI AG
Date: 16-12-2020
Abstract: Thermoplastic polyurethane (TPU) is a polymer material that has high ductility, good biocompatibility and excellent abrasion resistance. These properties open a pathway to manufacturing functional TPU parts for applications in various fields such as aerospace engineering, medical devices and sports equipment. This study aims to investigate the mechanical properties of additively manufactured TPU material affected by three different processing parameters, including build orientation, mix ratio of the new and reused powders and post-processing. A series of material tests are conducted on TPU dumb-bell specimens. It is found that the mix ratio of the new powder is the most critical factor in improving the mechanical properties of the printed TPU parts. Compared to reused powder, new powder has better particle quality and thermal properties. Besides, build orientation is also a very important factor. TPU parts printed in flat and on-edge orientations show better tensile strength and deformability than those printed in upright orientation. In addition, post-processing is found to significantly enhance the deformability of TPU parts.
A simple and compact Python code for complex 3D topology optimization
Publisher: Elsevier BV
Date: 07-2015
Topology optimization applied to the core of structural engineered wood product
Publisher: Elsevier BV
Date: 02-2023
Evolutionary methods for topology optimisation of continuous structures with design dependent loads
Publisher: Elsevier BV
Date: 05-2005
Experimental and numerical analysis of a novel assembled auxetic structure with two-stage programmable mechanical properties
Publisher: Elsevier BV
Date: 04-2023
Body-fitted bi-directional evolutionary structural optimization using nonlinear diffusion regularization
Publisher: Elsevier BV
Date: 06-2022
Generalized topology optimization for architectural design
Publisher: Springer Science and Business Media LLC
Date: 24-06-2022
DOI: 10.1007/S44223-022-00003-Y
Abstract: In recent years, topology optimization has become a popular strategy for creating elegant and innovative forms for architectural design. However, the use of existing topology optimization techniques in practical applications, especially for large-scale projects, is rare because the generated forms often cannot satisfy all the design requirements of architects and engineers. This paper identifies the limitations of commonly used assumptions in topology optimization and highlights the importance of having multiple solutions. We show how these limitations could be removed and present various techniques for generating erse and competitive structural designs that are more useful for architects. Unlike conventional topology optimization, we may include load and support conditions as additional design variables to enhance the structural performance substantially. Furthermore, we show that varying the design domain provides a plethora of opportunities to achieve more-desirable design outcomes.
A direct approach to achieving efficient free-form shells with embedded geometrical patterns
Publisher: Elsevier BV
Date: 04-2023
Topology optimization of building structures considering wind loading
Publisher: Trans Tech Publications, Ltd.
Date: 05-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.166-169.405
Abstract: The latest developments in structural topological optimization have been integrated with CFD for the optimization of building structures considering wind loading. Wind loads on a building are numerically simulated in ANSYS CFX and then transferred to ANSYS Static to get the structural response of the building in wind. The bi-directional evolutionary structural optimization (BESO) algorithm has been applied to buildings for an automatic structural topological optimization considering wind loading. The proposed approach is demonstrated by ex les of the optimum structural design of exterior bracing system of a high-rise building.
A design procedure for electric inductive capacitive resonators with negative permittivity
Publisher: Trans Tech Publications, Ltd.
Date: 10-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.448-453.2199
Abstract: Permittivity signifies a key component to metamaterial which can achieve negative index of refraction, but it has not been sufficiently addressed in computational design. This paper aims to attain negative permittivity through a topology optimization approach and provides an ex le equivalent to electric inductive-capacitive resonator. Similar to split ring resonator, this locally self-contained (without the demand for inter-cell connection) resonator allows keeping bulk electromagnetic properties homogeneously, facilitating mass fabrication, and realizing single s ling test.
Bending performance of 3D re-entrant and hexagonal metamaterials
Publisher: Elsevier BV
Date: 07-2023
New approach to preventing long acupuncture needles from buckling and contamination during insertion
Publisher: SAGE Publications
Date: 12-2014
Stress based optimization of torsional shafts using an evolutionary procedure
Publisher: Elsevier BV
Date: 08-2001
Topology optimization of frequency responses of fluid-structure interaction systems
Publisher: Elsevier BV
Date: 06-2015
Topology optimization of structures under dynamic response constraints
Publisher: Elsevier BV
Date: 07-2000
Evolutionary topology optimization of continuum structures with a global displacement control
Publisher: Elsevier BV
Date: 11-2014
Topological optimization design of structures under random excitations using SQP method
Publisher: Elsevier BV
Date: 11-2013
Design and manufacturing of lightweight modular broadband microwave absorbing metastructure
Publisher: Elsevier BV
Date: 11-2023
Optimizing Support Locations in the Roof–Column Structural System
Publisher: MDPI AG
Date: 19-03-2021
DOI: 10.3390/APP11062775
Abstract: The roof–column structural system is utilized for many engineering and architectural applications due to its structural efficiency. However, it typically requires column locations to be predetermined, and involves a tedious trial-and-error adjusting process to fulfil both engineering and architectural requirements. Finding efficient column distributions with the aid of computational methods, such as structural optimization, is an ongoing challenge. Existing methods are limited, with continuum methods involving the generation of undesired complex shapes, and discrete methods involving a time-consuming process for optimizing columns’ spatial order. This paper presents a new optimization method to design the distribution of a given number of vertical supporting columns under a roof structure. A computational algorithm was developed on the basis of the optimality-criterion (OC) method to preserve and removed candidate columns pre-embedded with design requirements. Three substrategies are presented to improve optimizer performance. The effectiveness of the new method was validated with a range of roof–column structural models. Treating column locations as design variables provides opportunities to significantly improve structural performance.
Improving efficiency of evolutionary structural optimization by implementing fixed grid mesh
Publisher: Springer Science and Business Media LLC
Date: 12-2003
Experiments and parametric studies on 3D metallic auxetic metamaterials with tuneable mechanical properties
Publisher: IOP Publishing
Date: 20-08-2015
Placebo devices as effective control methods in acupuncture clinical trials: A systematic review
Publisher: Public Library of Science (PLoS)
Date: 04-11-2015
Investigation of Various Methods for Minimising Uneven Displacements in Pedestrian Concrete Pavements
Publisher: Informa UK Limited
Date: 2010
A Numerical Modelling Framework for Investigating the Ballistic Performance of Bio-Inspired Body Armours
Publisher: MDPI AG
Date: 08-05-2023
DOI: 10.3390/BIOMIMETICS8020195
Abstract: Biological structures possess excellent damage tolerance, which makes them attractive for ballistic protection applications. This paper develops a finite element modelling framework to investigate the performance of several biological structures that are most relevant for ballistic protection, including nacre, conch, fish scales, and crustacean exoskeleton. Finite element simulations were conducted to determine the geometric parameters of the bio-inspired structures that can survive projectile impact. The performances of the bio-inspired panels were benchmarked against a monolithic panel with the same 4.5 mm overall thickness and projectile impact condition. It was found that the biomimetic panels that were considered possessed better multi-hit resistant capabilities compared to the selected monolithic panel. Certain configurations arrested a fragment simulating projectile with an initial impact velocity of 500 m/s, which was similar to the performance of the monolithic panel.
A novel combined auxetic tubular structure with enhanced tunable stiffness
Publisher: Elsevier BV
Date: 12-2021
Extending Goldberg’s method to parametrize and control the geometry of Goldberg polyhedra
Publisher: The Royal Society
Date: 08-2022
DOI: 10.1098/RSOS.220675
Abstract: Goldberg polyhedra have been widely studied across multiple fields, as their distinctive pattern can lead to many useful applications. Their topology can be determined using Goldberg’s method through generating topologically equivalent structures, named cages. However, the geometry of Goldberg polyhedra remains underexplored. This study extends Goldberg’s framework to a new method that can systematically determine the topology and effectively control the geometry of Goldberg polyhedra based on the initial shapes of cages. In detail, we first parametrize the cage’s geometry under specified topology and polyhedral symmetry then, we manipulate the predefined independent variables through optimization to achieve the user-defined geometric properties. The benchmark problem of finding equilateral Goldberg polyhedra is solved to demonstrate the effectiveness of the proposed method. Using this method, we have successfully achieved nearly exact spherical Goldberg polyhedra, with all vertices on a sphere and all faces being planar under extremely low numerical errors. Such results serve as strong numerical evidence for the existence of this new type of Goldberg polyhedra. Furthermore, we iteratively perform k -means clustering and optimization to significantly reduce the number of different edge lengths to benefit the cost reduction for architectural and engineering applications.
A novel bio-inspired helmet with auxetic lattice liners for mitigating traumatic brain injury
Publisher: IOP Publishing
Date: 11-09-2023
Evolutionary Topology Optimization of Continuum Structures: Methods and Applications
Publisher: Wiley
Date: 16-04-2010
Fishnet metamaterial with double negative refractive index in blue region of visible spectrum
Publisher: SPIE
Date: 11-09-2013
DOI: 10.1117/12.2035386
Investigating size effects of complex nanostructures through Young-Laplace equation and finite element analysis
Publisher: AIP Publishing
Date: 23-11-2015
DOI: 10.1063/1.4935819
Abstract: Analytical studies on the size effects of a simply-shaped beam fixed at both ends have successfully explained the sudden changes of effective Young's modulus as its diameter decreases below 100 nm. Yet they are invalid for complex nanostructures ubiquitously existing in nature. In accordance with a generalized Young-Laplace equation, one of the representative size effects is transferred to non-uniformly distributed pressure against an external surface due to the imbalance of inward and outward loads. Because the magnitude of pressure depends on the principal curvatures, iterative steps have to be adopted to gradually stabilize the structure in finite element analysis. Computational results are in good agreement with both experiment data and theoretical prediction. Furthermore, the investigation on strengthened and softened Young's modulus for two complex nanostructures demonstrates that the proposed computational method provides a general and effective approach to analyze the size effects for nanostructures in arbitrary shape.
Optimization of columns and frames against buckling
Publisher: Elsevier BV
Date: 03-2000
Lessons Learnt from a National Competition on Structural Optimization and Additive Manufacturing
Publisher: Bentham Science Publishers Ltd.
Date: 2021
DOI: 10.2174/2666001601999201006191103
Abstract: As an advanced design technique, topology optimization has received much attention over the past three decades. Topology optimization aims at finding an optimal material distribution in order to maximize the structural performance while satisfying certain constraints. It is a useful tool for the conceptional design. At the same time, additive manufacturing technologies have provided unprecedented opportunities to fabricate intricate shapes generated by topology optimization. To design a highly efficient structure using topology optimization and to fabricate it using additive manufacturing. The bi-directional evolutionary structural optimization (BESO) technique provides the conceptional design, and the topology-optimized result is post-processed to obtain smooth structural boundaries. We have achieved a highly efficient and elegant structural design which won the first prize in a national competition in China on design optimization and additive manufacturing. In this paper, we present an effective topology optimization approach to maximize the structural load-bearing capacity and establish a procedure to achieve efficient and elegant structural designs. In the loading test of the final competition, our design carried the highest loading and won the first prize in the competition, which demonstrates the capability of BESO in engineering applications.
Improving the predictability of hiley pile driving formula in the quality control of the pile foundation
Publisher: Trans Tech Publications, Ltd.
Date: 05-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.261-263.1292
Abstract: Pile Dynamic Formulas are the oldest and frequently used method to determine bearing capacity of piles. The more recent method is based on the Wave Equation analysis and different formulations such as Case Mathod, TNO, CAPWAP and TEPWAP which were developed for pre-driving analysis and post-driving measurements applications. The major factors for the common use of the dynamic formulas have been due to their simplicity, cost effectiveness and applicability in various piling situations. However, in some literature the energy approach have been given an unfair reputation as being unreliable and less accurate than the more analytical or dynamic testing methods. One of the issues due to the poor performance of the dynamic formulas is that, historically, the hammer energy and the energy trasferred to pile had to be assumed. Nevertheless, with the advent of computers, new technologies are emerging with the advancement in construction industry. This has produced gradual improvements that have resulted in the dynamic method to be used on many projects with greater reliability. In this paper, a review of the different testing methods as well as pros and cons of the pile driving formulas are discussed. Also, an approach to improving the widely used Hiley dynamic equation is presented. This approach enables evaluation of the pile capacity to be made more accurately.
Parallel BESO framework for solving high-resolution topology optimisation problems
Publisher: Elsevier BV
Date: 02-2023
Comparing optimal material microstructures with optimal periodic structures
Publisher: Elsevier BV
Date: 03-2013
Topological design and additive manufacturing of porous metals for bone scaffolds and orthopaedic implants: A review
Publisher: Elsevier BV
Date: 03-2016
DOI: 10.1016/J.BIOMATERIALS.2016.01.012
Abstract: One of the critical issues in orthopaedic regenerative medicine is the design of bone scaffolds and implants that replicate the biomechanical properties of the host bones. Porous metals have found themselves to be suitable candidates for repairing or replacing the damaged bones since their stiffness and porosity can be adjusted on demands. Another advantage of porous metals lies in their open space for the in-growth of bone tissue, hence accelerating the osseointegration process. The fabrication of porous metals has been extensively explored over decades, however only limited controls over the internal architecture can be achieved by the conventional processes. Recent advances in additive manufacturing have provided unprecedented opportunities for producing complex structures to meet the increasing demands for implants with customized mechanical performance. At the same time, topology optimization techniques have been developed to enable the internal architecture of porous metals to be designed to achieve specified mechanical properties at will. Thus implants designed via the topology optimization approach and produced by additive manufacturing are of great interest. This paper reviews the state-of-the-art of topological design and manufacturing processes of various types of porous metals, in particular for titanium alloys, biodegradable metals and shape memory alloys. This review also identifies the limitations of current techniques and addresses the directions for future investigations.
Maximizing the effective stiffness of laminate composite materials
Publisher: Elsevier BV
Date: 02-2014
Optimal design of multiple load case structures using an evolutionary procedure
Publisher: Emerald
Date: 04-1994
DOI: 10.1108/02644409410799290
Abstract: The structural optimization presented in this paper is based on an evolutionary procedure, developed recently, in which the low stressed part of a structure is removed from the structure step‐by‐step until an optimal design is obtained. Various tests have shown the effectiveness of this evolutionary procedure. The purpose of this paper is to present applications of such an evolutionary procedure to the optimal design of structures with multiple load cases or with a traffic (moving) load.
Bi-directional evolutionary structural optimization for design of compliant mechanisms
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.535-536.373
Abstract: This research presents a topology optimization approach based on Bi-directional Evolutionary Structural Optimization (BESO) for optimal design of compliant mechanisms. Due to the complexity of the design for various compliant mechanisms, a new multi-objective optimization model is established by considering the mechanism flexibility and structural stiffness simultaneously. The sensitivity analysis is performed by applying the adjoint sensitivity approach to both the kinematical function and the structural function. The sensitivity numbers are derived according to the variation of the objective function with respect to the design variables. Some numerical ex les are given to demonstrate the effectiveness of the proposed method for the design of various compliant mechanisms.
Designing 2D stochastic porous structures using topology optimisation
Publisher: Elsevier BV
Date: 10-2023
Detail control strategies for topology optimization in architectural design and development
Publisher: Elsevier BV
Date: 04-2022
Multicriteria optimization that minimizes maximum stress and maximizes stiffness
Publisher: Elsevier BV
Date: 11-2021
An evolutionary shape optimization for elastic contact problems subject to multiple load cases
Publisher: Elsevier BV
Date: 08-2005
Bridge topology optimisation with stress, displacement and frequency constraints
Publisher: Elsevier BV
Date: 02-2003
Selective hinge removal strategy for architecting hierarchical auxetic metamaterials
Publisher: Springer Science and Business Media LLC
Date: 08-12-2022
DOI: 10.1038/S43246-022-00322-7
Abstract: Mechanical metamaterials are man-made structures capable of achieving different intended mechanical properties through their artificial, structural design. Specifically, metamaterials with negative Poisson’s ratio, known as auxetics, have been of widespread interest to scientists. It is well-known that some pivotally interconnected polygons exhibit auxetic behaviour. While some hierarchical variations of these structures have been proposed, generalising such structures presents various complexities depending on the initial configuration of their basic module. Here, we report the development of pivotally interconnected polygons based on even-numbered modules, which, in contrast to odd-numbered ones, are not straightforward to generalize. Particularly, we propose a design method for such assemblies based on the selective removal of rotational hinges, resulting in fully-deployable structures, not achievable with previously known methods. Analytical and numerical analyses are performed to evaluate Poisson’s ratio, verified by prototyping and experimentation. We anticipate this work to be a starting point for the further development of such metamaterials.
Automation in rammed earth construction for industry 4.0: Precedent work, current progress and future prospect
Publisher: Elsevier BV
Date: 04-2023
Design of hierarchical structures for synchronized deformations
Publisher: Springer Science and Business Media LLC
Date: 24-01-2017
DOI: 10.1038/SREP41183
Abstract: In this paper we propose a general method for creating a new type of hierarchical structures at any level in both 2D and 3D. A simple rule based on a rotate-and-mirror procedure is introduced to achieve multi-level hierarchies. These new hierarchical structures have remarkably few degrees of freedom compared to existing designs by other methods. More importantly, these structures exhibit synchronized motions during opening or closure, resulting in uniform and easily-controllable deformations. Furthermore, a simple analytical formula is found which can be used to avoid collision of units of the structure during the closing process. The novel design concept is verified by mathematical analyses, computational simulations and physical experiments.
Concurrent topological design of composite thermoelastic macrostructure and microstructure with multi-phase material for maximum stiffness
Publisher: Elsevier BV
Date: 08-2016
Mechanical properties of aluminum foam filled re-entrant honeycomb with uniform and gradient designs
Publisher: Elsevier BV
Date: 04-2023
Auxetic metamaterials and structures: a review
Publisher: IOP Publishing
Date: 24-01-2018
Evolutionary structural optimisation (ESO) using a bidirectional algorithm
Publisher: Emerald
Date: 12-1998
DOI: 10.1108/02644409810244129
Abstract: Describes development work to combine the basic ESO with the additive evolutionary structural optimisation (AESO) to produce bidirectional ESO whereby material can be added and can be removed. It will be shown that this provides the same results as the traditional ESO. This has two benefits, it validates the whole ESO concept and there is a significant time saving since the structure grows from a small initial one rather than contracting from a sometimes huge initial one where 90 per cent of the material gets removed over many hundreds of finite element analysis (FEA) evolutionary cycles. Presents a brief background to the current state of Structural Optimisation research. This is followed by a discussion of the strategies for the bidirectional ESO (BESO) algorithm and two ex les are presented.
Creating innovative and efficient structures and materials
Publisher: Trans Tech Publications, Ltd.
Date: 10-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.438-439.439
Abstract: Novel and efficient structural and material designs can be realized by topology optimization that is capable of maximizing the performance of structural systems under given constraints. The bi-directional evolutionary structural optimization (BESO) method has been developed into an effective tool for topology optimization of load-bearing structures and materials. The latest advances of BESO are aimed at expanding its practical applications to a wider range of structural systems on both macro and micro scales. This paper presents recent developments of BESO for optimal design problems of a variety of structural systems ranging from buildings of large scales to materials of micro scales. Selected applications are introduced to demonstrate the capability of BESO. Ex les presented in this paper are based on research and industrial projects of the Centre for Innovative Structures and Materials (www.rmit.edu.au/research/cism) at RMIT University.
Evolutionary topology optimization of periodic composites for extremal magnetic permeability and electrical permittivity
Publisher: Springer Science and Business Media LLC
Date: 31-01-2012
Aircraft wing design automation with ESO and GESO
Publisher: Inderscience Publishers
Date: 2002
Simultaneously optimizing supports and topology in structural design
Publisher: Elsevier BV
Date: 12-2021
Design, manufacturing and applications of auxetic tubular structures: A review
Publisher: Elsevier BV
Date: 06-2026
Concurrent design of composite macrostructure and multi-phase material microstructure for minimum dynamic compliance
Publisher: Elsevier BV
Date: 09-2015
A thinning algorithm based approach to controlling structural complexity in topology optimization
Publisher: Elsevier BV
Date: 09-2022
Buckling-induced retraction of structured spherical shell under pressure
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.842
Abstract: This paper investigates the reversible retraction of a spherical perforated shell that is made from nonlinear soft material. The buckling and post-buckling simulation in Abaqus shows the skeleton ligaments of such a buckliball rotate in the beginning and buckle thereafter, resulting in the shrinkage and encapsulation of the whole structure in the final stage. We used dynamic-explicit method in the simulation and its superiority over others is verified by obtaining correct buckling patterns efficiently and stably.
Optimizing load locations and directions in structural design
Publisher: Elsevier BV
Date: 10-2022
Design of structures for optimal static strength using ESO
Publisher: Elsevier BV
Date: 02-2005
Manufacturing, characteristics and applications of auxetic foams: A state-of-the-art review
Publisher: Elsevier BV
Date: 04-2022
Structural topology optimization with an adaptive design domain
Publisher: Elsevier BV
Date: 02-2022
Structural topology design with multiple thermal criteria
Publisher: Emerald
Date: 09-2000
DOI: 10.1108/02644400010340642
Abstract: This paper shows how the evolutionary structural optimization (ESO) algorithm can be used to achieve a multiple criterion design for a structure in a thermal environment. The proposed thermal ESO procedure couples an evolutionary iterative process of a finite element heat conduction solution and a finite element thermoelastic solution. The overall efficiency of material usage is measured in terms of the combination of thermal stress levels and heat flux densities by using a combination strategy with weighting factors. The ESO method then works by eliminating from the structural domain under‐utilized material. In this paper, a practical design ex le of a printed circuit board substrate is presented to illustrate the capabilities of the ESO algorithm for thermal design optimization in multiple load environments.
Design and fabrication of materials and structures with negative Poisson's ratio and negative linear compressibility
Publisher: SPIE
Date: 11-04-2017
DOI: 10.1117/12.2263613
Concurrent topology optimization for minimizing frequency responses of two-level hierarchical structures
Publisher: Elsevier BV
Date: 04-2016
Recent developments in evolutionary structural optimization (ESO) for continuum structures
Publisher: IOP Publishing
Date: 06-2014
An innovative design based on CAD environment
Publisher: Trans Tech Publications, Ltd.
Date: 08-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.308-310.1166
Abstract: The mathematical development of structural topology optimization provides a mature tool for design optimization, although the application is still very limited in engineering practice. This paper intends to study the application of topology optimization in industrial design via commercial CAD software interfaces. An innovative numerical procedure for this purpose is introduced based on convenient CAD modeling interfaces. As an instance, the B-spline based environment Rhinoceros3D features the modeling module for the optimization procedure, in collaboration with an additional optimization engine BESO3D. The topology optimization is realized based on the CAD model from Rhinoceros and outputs the optimal solution into Rhinoceros after computation. Further interpretation of the optimization results is discussed within the framework of Rhinoceros. Design applications of the modeling-optimization design integration are showcased as the ex les to demonstrate the efficiency and robustness of topology optimization in industrial design.
Luffa sponge as a sustainable engineering material
Publisher: Trans Tech Publications, Ltd.
Date: 11-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.238.3
Abstract: The paper presents the first scientific study of the stiffness, strength and energy absorption characteristics of the luffa sponge with a view to using it as an alternative sustainable engineering material for various practical applications. A series of compression tests on luffa sponge columns have been carried out. The stress-strain curves show a near constant plateau stress over a long strain range, which is ideal for energy absorption applications. It is found that the luffa sponge material exhibits remarkable stiffness, strength and energy absorption capacity that are comparable to those of some commonly-used metallic cellular materials. These properties are due to its light-weight base material, and its structural hierarchy at several length scales. Empirical formulae have been developed for stiffness, strength, densification strain and specific energy absorption at the macroscopic level by considering the luffa fiber as the base material. A comparative study shows that the luffa sponge material outperforms a variety of traditional engineering materials.
A novel re-entrant honeycomb metamaterial with tunable bandgap
Publisher: IOP Publishing
Date: 26-07-2022
Abstract: An auxetic metamaterial consisting of a re-entrant honeycomb structure with hierarchical characteristics (RHS-H) is proposed. The new structure is constructed by attaching small re-entrant structural unit cells to the nodes of the traditional re-entrant structures. Not only can the overall stiffness and stability of the proposed structure be tuned during compression and tension, but a better acoustic performance is also obtained compared with traditional re-entrant honeycomb structures. Firstly, the deformation mechanism of the bandgap is numerically explored by analyzing the dispersion curve of the microstructure as well as the upper and lower bounds of the bandgap vibrational modes. Secondly, the bandgap tunability of the designed structure under uniaxial compression or tension is discussed. Finally, the transmittance of finite period size is calculated to verify the numerical results of the bandgap. Numerical simulation results show that the proposed novel RHS-H has attenuation characteristics of a tunable low-frequency plane wave through a reasonable selection of compressive strain, tensile strain and geometric parameters. The vibration d ing strength of the bandgap increases under tensile strain. When the auxetic effect is enhanced, the first and second bandgaps become lower and wider. The novel metamaterial has potential applications in vibration and noise reduction and the design of acoustic devices in dynamic environments, while providing new ideas and a methodology for the real-time adjustment of bandgaps.
Concurrent Design of Structures and Materials Based on the Bi-Directional Evolutionary Structural Optimization
Publisher: Trans Tech Publications, Ltd.
Date: 10-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.438-439.445
Abstract: Different from the independent optimization of macrostructures or materials, a two-scale topology optimization algorithm is developed in this paper based on the bi-directional evolutionary structural optimization (BESO) method for concurrently designing a macrostructure and its composite microstructure. The objective is to minimize the mean compliance of the structure which is composed of a two-phase composite. The effective properties of the composite are calculated through the homogenization method and integrated into the finite element analysis of the structure. Sensitivity analysis for the structure and microstructure is conducted by the adjoint method. Based on the derived sensitivity numbers, the BESO approach is applied for iteratively updating the topologies for both the structure at the macro level and the microstructure of composite at the micro level. Numerical ex les are presented to validate the effectiveness of the proposed optimization algorithm.
Instability, chaos, and growth and decay of energy of time‐stepping schemes for non‐linear dynamic equations
Publisher: Wiley
Date: 05-1994
Explicit formulas for correcting finite‐element predictions of natural frequencies
Publisher: Wiley
Date: 08-1993
Thermoelastic topology optimization for problems with varying temperature fields
Publisher: Informa UK Limited
Date: 04-2001
Bi-directional evolutionary structural optimization with buckling constraints
Publisher: Springer Science and Business Media LLC
Date: 16-03-2023
DOI: 10.1007/S00158-023-03517-9
Abstract: Buckling is a critical phenomenon in structural members under compression, which could cause catastrophic failure of a structure. To increase the buckling resistance in structural design, a novel topology optimization approach based on the bi-directional evolutionary structural optimization (BESO) method is proposed in this study with the consideration of buckling constraints. The BESO method benefits from using only two discrete statuses (solid and void) for design variables, thereby alleviating numerical issues associated with pseudo buckling modes. The Kreisselmeier-Steinhauser aggregation function is introduced to aggregate multiple buckling constraints into a differentiable one. An augmented Lagrangian multiplier is developed to integrate buckling constraints into the objective function to ensure computational stability. Besides, a modified design variable update scheme is proposed to control the evolutionary rate after the target volume fraction is reached. Four topology optimization design ex les are investigated to demonstrate the effectiveness of the buckling-constrained BESO method. The numerical results show that the developed optimization algorithm with buckling constraints can significantly improve structural stability with a slight increase in compliance.
Lattice Ti structures with low rigidity but compatible mechanical strength: Design of implant materials for trabecular bone
Publisher: Springer Science and Business Media LLC
Date: 06-2016
Optimal topology selection of continuum structures with displacement constraints
Publisher: Elsevier BV
Date: 08-2000
Bi-directional Evolutionary Structural Optimization on Advanced Structures and Materials: A Comprehensive Review
Publisher: Springer Science and Business Media LLC
Date: 19-11-2016
Two-scale dynamic optimal design of composite structures in the time domain using equivalent static loads
Publisher: Elsevier BV
Date: 05-2016
Evolutionary thickness design with stiffness maximization and stress minimization criteria
Publisher: Wiley
Date: 30-11-2001
DOI: 10.1002/NME.241
Stiffness and inertia multicriteria evolutionary structural optimisation
Publisher: Emerald
Date: 11-2001
Evolutionary topology optimization of structures with multiple displacement and frequency constraints
Publisher: SAGE Publications
Date: 02-2012
DOI: 10.1260/1369-4332.15.2.359
Abstract: Topological design with multiple constraints is of great importance in practical engineering design problems. The present work extends the bi-directional evolutionary structural optimization (BESO) method to multiple constraints of displacement and frequency in addition to the amount of material usage. Besides the binary design variables, the Lagrange multipliers for constraints are considered as additional continuous variables and determined by a search scheme. The enhanced approach can include a number of constraints besides the simple volume constraint. To demonstrate the effectiveness of the proposed BESO approach, several ex les are presented for the maximization of structural overall stiffness subject to the material volume, displacement and frequency constraints.
Energy absorption and impact resistance of hybrid triply periodic minimal surface (TPMS) sheet-based structures
Publisher: Elsevier BV
Date: 12-2023
Discussion
Publisher: SAGE Publications
Date: 07-1996
Optimization of underground excavation in rock masses using ESO techniques
Publisher: WIT Press
Date: 20-06-2012
DOI: 10.2495/OP120151
Dynamic response reliability based topological optimization of continuum structures involving multi-phase materials
Publisher: Elsevier BV
Date: 08-2016
Natural frequency optimization of structures using a soft-kill BESO method
Publisher: IOP Publishing
Date: 06-2014
Evolutionary structural optimisation using an additive algorithm
Publisher: Elsevier BV
Date: 02-2000
Reducing the number of different nodes in space frame structures through clustering and optimization
Publisher: Elsevier BV
Date: 06-2023
Auxetic nail: Design and experimental study
Publisher: Elsevier BV
Date: 11-2018
Design of dimpled tubular structures for energy absorption
Publisher: Elsevier BV
Date: 03-2017
Form finding for complex structures using evolutionary structural optimization method
Publisher: Elsevier BV
Date: 2005
Energy absorption of thin-walled tubes with pre-folded origami patterns: Numerical simulation and experimental verification
Publisher: Elsevier BV
Date: 06-2016
Computational efficiency and validation of bi-directional evolutionary structural optimization
Publisher: Elsevier BV
Date: 09-2000
A Study on Truss Bolt Mechanism in Controlling Stability of Underground Excavation and Cutter Roof Failure
Publisher: Springer Science and Business Media LLC
Date: 09-02-2013
Shell buckling: from morphogenesis of soft matter to prospective applications
Publisher: IOP Publishing
Date: 20-07-2018
Abstract: Being one of the commonest deformation modes for soft matter, shell buckling is the primary reason for the growth and nastic movement of many plants, as well as the formation of complex natural morphology. On-demand regulation of buckling-induced deformation associated with wrinkling, ruffling, folding, creasing and delaminating has profound implications for erse scopes, which can be seen in its broad applications in microfabrication, 4D printing, actuator and drug delivery. This paper reviews the recent remarkable developments in the shell buckling of soft matter to explain the most representative natural morphogenesis from the perspectives of theoretical analysis in continuum mechanics, finite element analysis, and experimental validations. Imitation of buckling-induced shape transformation and its applications are also discussed for the innovations of sophisticated materials and devices in future.
Relationship between buckling of acupuncture needles and the handle type
Publisher: SAGE Publications
Date: 10-2014
DOI: 10.1136/ACUPMED-2014-010586
Abstract: Most popular single-use acupuncture needles consist of a stainless steel shaft with a handle made of copper coil or plastic stick. To determine the strengths and weaknesses of these two handle types for needle buckling. The buckling load for acupuncture needles with these two different handle types was determined using a digital scale, and the stiffness of stainless steel wires used in different types of acupuncture needles was measured using a Dynamic Mechanical Analysis machine. This study showed that an acupuncture needle with a copper coil handle was far more susceptible to buckling than a needle with a plastic stick handle. The average buckling force of acupuncture needles with plastic stick handles was 46.7% higher than that with copper coil handles for needles of 0.25 mm×30 mm, and 30.8% higher for needles of 0.25 mm×60 mm. Replacing a copper coil handle with a plastic stick handle could save about 100 tonnes of copper wires and 20 million metres of medical grade stainless steel wire a year worldwide. The results from this study suggest that the common practice of using coiled copper for handles on acupuncture needles should be re-evaluated. Replacing a copper coil handle with a plastic stick handle would significantly reduce needle buckling and improve patient comfort and safety. This would also reduce the consumption of copper and medical grade stainless steel wire considerably.
Evolutionary structural optimisation (ESO) for combined topology and size optimisation of discrete structures
Publisher: Elsevier BV
Date: 08-2000
A novel auxetic acoustic metamaterial plate with tunable bandgap
Publisher: Elsevier BV
Date: 07-2022
Improving finite element predictions of buckling loads of beams and frames
Publisher: Elsevier BV
Date: 07-1994
A complete Physics-Informed Neural Network-based framework for structural topology optimization
Publisher: Elsevier BV
Date: 12-2023
A novel type of tubular structure with auxeticity both in radial direction and wall thickness
Publisher: Elsevier BV
Date: 06-2021
Thermal shrinkage and stability of diamondene nanotubes
Publisher: IOP Publishing
Date: 18-12-2019
Abstract: By curving a rectangular diamondene, an sp
Topology optimisation of composites containing base materials of distinct poisson's ratios
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.813
Abstract: From recent studies on natural composites such as nacre and bone, it has shown that the mechanical properties of the composite are significantly affected by the Poisson’s ratio of each constituent phase. In some cases it is found that when the Poisson’s ratio approaches the incompressibility limit, the stiffness of the composite in one or more directions can increase dramatically, in some cases by two or more orders of magnitude than the softer phase. In this paper we investigate designing the composite of maximum stiffness by a topology optimisation approach. The method used is based on the bi-directional evolutionary structural optimisation (BESO). The Optimisation problem is formulated and it is solved by a searching algorithm based on the sensitivity analysis. The effect of interpolation function in the sensitivity analysis is studied. Ex les of different combinations of Poisson’s ratios are presented. The stiffness is found to increase from its base value. In the case of one phase having negative Poisson’s ratio, the increase is very significant. It is concluded that the proposed method is effective in optimising the stiffness of this class of composite.
Topology optimization of microstructures for multi-functional graded composites
Publisher: Springer International Publishing
Date: 15-10-2015
Method for varying the number of cavities in an optimized topology using Evolutionary Structural Optimization
Publisher: Springer Science and Business Media LLC
Date: 04-2000
A simple approach to structural frequency optimization
Publisher: Elsevier BV
Date: 12-2004
Evolutionary natural frequency optimization of two‐dimensional structures with additional non‐structural lumped masses
Publisher: Emerald
Date: 03-1997
DOI: 10.1108/02644409710166208
Abstract: Extends the evolutionary structural optimization method to the solution for the natural frequency optimization of a two‐dimensional structure with additional non‐structural lumped masses. Owing to the significant difference between a static optimization problem and a structural natural frequency optimization problem, five basic criteria for the evolutionary natural frequency optimization have been established. The inclusion of these criteria into the evolutionary structural optimization method makes it possible to solve structural natural frequency optimization problems for two‐dimensional structures with additional non‐structural lumped masses. Gives two ex les to demonstrate the feasibility of the extended evolutionary structural optimization method when it is used to solve structural natural frequency optimization problems.
A simple evolutionary procedure for structural optimization
Publisher: Elsevier BV
Date: 12-0009
Topology optimization of composite structure using Bi-directional Evolutionary Structural Optimization method
Publisher: Elsevier BV
Date: 2011
Tuning the performance of metallic auxetic metamaterials by using buckling and plasticity
Publisher: MDPI AG
Date: 18-01-2016
DOI: 10.3390/MA9010054
A posteriori local error estimation and adaptive time‐stepping for newmark integration in dynamic analysis
Publisher: Wiley
Date: 1992
Strength design of porous materials using B-spline based level set method
Publisher: Elsevier BV
Date: 2024
Evolutionary structural optimization for problems with stiffness constraints
Publisher: Elsevier BV
Date: 04-1996
A New Approach Based on Strain Sensitivity for Reinforcement Optimization in Slope Stability Problems
Publisher: Springer Science and Business Media LLC
Date: 25-01-2016
Ballistic performance of a lightweight nacre-inspired armour panel – a numerical study
Publisher: Elsevier BV
Date: 07-2022
Evaluating stepping displacements of pedestrian concrete pavements connected by EPDM rubber and PVC joiners
Publisher: Informa UK Limited
Date: 08-2008
Compressive behavior of luffa sponge material at high strain rate
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.535-536.465
Abstract: The strain rate effect of luffa sponge material is an indispensable property for it to be used for acoustic, vibration, and impact energy absorption. Compressive tests at different strain rates on cylindrical column specimens of luffa sponge material were conducted over a wide density ranging from 24 to 64 kg/m 3 . A photographic technique was applied to measure the section area of the specimen with irregular shape. The mechanical properties of luffa sponge material at various strain rates were obtained based on this measurement. The dynamic data were compared to those of quasi-static experiments. It was found that compressive strength, plateau stress and specific energy absorption of luffa sponge material were sensitive to the rate of loading. Empirical formulae were developed for strength, densification strain and specific energy absorption at various strain rates in the macroscopic level by considering the luffa fiber as base material.
A simple 3D re-entrant auxetic metamaterial with enhanced energy absorption
Publisher: Elsevier BV
Date: 09-2022
Topology optimization of photonic band gap crystals
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.824
Abstract: This paper proposes a new topology optimization algorithm based on the bi-directional evolutionary structural optimization (BESO) method for the design of photonic band gap crystals. The photonic crystals are assumed to be periodically composed of two given dielectric materials. Based on the finite element analysis, the proposed BESO algorithm gradually re-distributes dielectric materials within the unit cell until the resulting photonic crystals possess a maximal band gap at the desirable frequency level. Numerical ex les for both transverse magnetic (TM) and transverse electric (TE) polarizations are presented, and the optimized photonic crystals exhibit novel patterns markedly different from traditional designs of photonic crystals.
Concurrent topological design of composite structures and materials containing multiple phases of distinct Poisson’s ratios
Publisher: Informa UK Limited
Date: 28-06-2017
A simple error estimator and adaptive time stepping procedure for dynamic analysis
Publisher: Wiley
Date: 1991
A numerical model for immiscible two‐phase fluid flow in a porous medium and its time domain solution
Publisher: Wiley
Date: 20-10-1990
A nodal-based optimization method for the design of continuous fiber-reinforced structures
Publisher: Elsevier BV
Date: 11-2023
Convergence of topological patterns of optimal periodic structures under multiple scales
Publisher: Springer Science and Business Media LLC
Date: 23-12-2012
Finding globally optimal arrangements of multiple point loads in structural design using a single FEA
Publisher: Springer Science and Business Media LLC
Date: 04-2023
DOI: 10.1007/S00158-023-03535-7
Abstract: Many structures around us are designed to carry point loads. Such structures are typically sensitive to load arrangements, including load locations, magnitudes, and directions a slight change in these ingredients could significantly affect the structural response. Therefore, knowing the extremal load arrangements to achieve the best and worst structural performance holds great potential to maximize structural efficiency and avoid structural failure, respectively. Existing studies have attempted to optimize load conditions using iterative optimization algorithms. However, they cannot always guarantee to find the global optimum and may instead obtain the local optima. In this study, we propose a new method, the single FEA method , that can effectively and efficiently find the extremal load conditions of a given structure. The new method considers all possible arrangements of prescribed loads without needing to create and analyze the corresponding finite element models. This is achieved by utilizing a single finite element analysis (FEA) with multiple load cases, where each load case has a unit load applied at one of the candidate load locations. Using the proposed method, we can quickly obtain the extremal load arrangements of the structure to produce the best and worst stiffness performance. A variety of 2D and 3D ex les are presented to demonstrate the effectiveness and wide applicability of the new method.
A simple auxetic tubular structure with tuneable mechanical properties
Publisher: IOP Publishing
Date: 13-05-2016
Concurrent design of composite macrostructure and cellular microstructure under random excitations
Publisher: Elsevier BV
Date: 05-2015
Evolutionary topology optimization for temperature reduction of heat conducting fields
Publisher: Elsevier BV
Date: 11-2004
On the shape transformation of cone scales
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SM01805J
Abstract: The shape-morphing behaviours of some biological systems have drawn considerable interest over many years. This paper ulges that the opening and closing mechanism of pine cones is attributed to the self-bending of their scales, which undergo three states of humidity-driven deformation in terms of Föppl-von Kármán plate theory. Both numerical simulation and experimental measurement support the theoretical analysis, showing that the longitudinal principal curvature and the transverse principal curvature bifurcate at a critical humidity level according to the thickness and shape of scales. These findings help us understand the shape transformation of bilayer or multi-layer natural structures and gain insights into the design of transformable devices/materials with great potential in numerous applications.
Australian Indigenous Clients with a Borderline Personality Disorder Diagnosis: A Contextual Review of the Literature
Publisher: Springer Science and Business Media LLC
Date: 30-05-2014
Evolutionary structural optimization for stress minimization problems by discrete thickness design
Publisher: Elsevier BV
Date: 12-2000
An efficient method for topology optimization of continuum structures in the presence of uncertainty in loading direction
Publisher: World Scientific Pub Co Pte Lt
Date: 17-11-2017
DOI: 10.1142/S0219876217500542
Abstract: This paper presents a simple yet efficient method for the topology optimization of continuum structures considering interval uncertainties in loading directions. Interval mathematics is employed to equivalently transform the uncertain topology optimization problem into a deterministic one with multiple load cases. An efficient soft-kill bi-directional evolutionary structural optimization (BESO) method is proposed to solve the problem, which only requires two finite element analyses per iteration for each external load with directional uncertainty regardless of the number of the multiple load cases. The presented algorithm leads to significant computational savings when compared with Monte Carlo-based optimization (MCBO) algorithms. A series of numerical ex les including symmetric and nonsymmetric loading variations demonstrate the considerable improvement of computational efficiency of the proposed approach as well as the significance of including uncertainties in topology optimization when to design a structure. Optimums obtained from the proposed algorithm are verified by MCBO method.
Optimizing two-level hierarchical particles for thin-film solar cells
Publisher: The Optical Society
Date: 26-02-2013
DOI: 10.1364/OE.21.00A285
Mechanical response of TiAl6V4 lattice structures manufactured by selective laser melting in quasistatic and dynamic compression tests
Publisher: Laser Institute of America
Date: 09-12-2015
DOI: 10.2351/1.4898835
Abstract: This paper focusses on the investigation of the mechanical properties of lattice structures manufactured by selective laser melting using contour-hatch scan strategy. The motivation for this research is the systematic investigation of the elastic and plastic deformation of TiAl6V4 at different strain rates. To investigate the influence of the strain rate on the mechanical response (e.g., energy absorption) of TiAl6V4 structures, compression tests on TiAl6V4-lattice structures with different strain rates are carried out to determine the mechanical response from the resulting stress-strain curves. Results are compared to the mechanical response of stainless steel lattice structures (316L). It is shown that heat-treated TiAl6V4 specimens have a larger breaking strain and a lower drop of stress after failure initiation. Main finding is that TiAl6V4 lattice structures show brittle behavior and low energy absorption capabilities compared to the ductile behaving 316L lattice structures. For larger strain rates, ultimate tensile strength of TiAl6V4 structures is more than 20% higher compared to lower strain rates due to cold work hardening.
Origami-based acoustic metamaterial for tunable and broadband sound attenuation
Publisher: Elsevier BV
Date: 02-2023
A global horizon scan of the future impacts of robotics and autonomous systems on urban ecosystems
Publisher: Springer Science and Business Media LLC
Date: 04-01-2021
Underground excavation shape optimization using an evolutionary procedure
Publisher: Elsevier BV
Date: 03-2005
Numerical simulation of three-dimensional multicomponent Cahn–Hilliard systems
Publisher: Elsevier BV
Date: 05-2021
Design of lattice structures with controlled anisotropy
Publisher: Elsevier BV
Date: 03-2016
Improved method for evolutionary structural optimization against buckling
Publisher: Elsevier BV
Date: 2001
Designing composites with negative linear compressibility
Publisher: Elsevier BV
Date: 10-2017
3D and multiple load case bi-directional evolutionary structural optimization (BESO)
Publisher: Springer Science and Business Media LLC
Date: 1999
Impact of transaction attributes on transaction costs in project alliances: Disaggregated analysis
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2015
Layout optimization of continuum structures considering the probabilistic and fuzzy directional uncertainty of applied loads based on the cloud model
Publisher: Springer Science and Business Media LLC
Date: 18-09-2016
Pump drill: A superb device for converting translational motion into high-speed rotation
Publisher: Elsevier BV
Date: 10-2017
A novel auxetic metamaterial with enhanced mechanical properties and tunable auxeticity
Publisher: Elsevier BV
Date: 05-2022
A nano continuous variable transmission system from nanotubes
Publisher: IOP Publishing
Date: 15-01-2018
Abstract: A nano continuous variable transmission (nano-CVT) system is proposed by means of carbon nanotubes (CNTs). The dynamic behavior of the CNT-based nanosystem is assessed using molecular dynamics simulations. The system contains a rotary CNT-motor and a CNT-bearing. The tube axes of the nanomotor and the rotor in the bearing are laid in parallel, and the distance between them is known as the eccentricity of the rotor with a diameter of d. By changing the eccentricity (e) of the rotor from 0 to d, some interesting rotation transmission phenomena are discovered, whose procedures can be used to design various nanodevices. This might include the failure of rotation transmission-i.e. the rotor has no rotation-when e ≥ d at an extremely low temperature, or when the edges of the two tubes are orthogonal at their intersections in any condition. This hints that the state of the nanosystem can be used as an on/off switch or breaker. For a system with e = d and a high temperature, the rotor rotates in the reverse direction of the motor. This means that the output signal (rotation) is the reverse of the input signal. When changing the eccentricity from 0 to d continuously, the output signal gradually decreases from a positive value to a negative value as a result a nano-CVT system is obtained.
An assessment of time integration schemes for non-linear dynamic equations
Publisher: Elsevier BV
Date: 04-1996
A modular continuous robot constructed by Miura-derived origami tubes
Publisher: Elsevier BV
Date: 08-2023
Optimal design of material microstructure for maximizing damping dissipation velocity of piezoelectric composite beam
Publisher: Elsevier BV
Date: 08-2017
Introduction of fixed grid in evolutionary structural optimisation
Publisher: Emerald
Date: 06-2000
DOI: 10.1108/02644400010334838
Abstract: Introduces a faster and improved structural optimisation method which combines fixed grid finite element analysis (FG FEA) and evolutionary structural optimisation (ESO). ESO optimises a structure by removing a few elements at every iteration. FG methods allow fast mesh generation, fast solution and fast re‐evaluation of the modified meshes. The implementation of FG into the ESO process eliminates the need for regenerating the mesh and a few arithmetic calculations replace the full regeneration of the stiffness matrix every time the structure is modified. This greatly reduces the solution time, and the ex les presented in this paper demonstrate and validate the method.
A hole-filling based approach to controlling structural complexity in topology optimization
Publisher: Elsevier BV
Date: 11-2023
Improving cracking and drying shrinkage properties of cement mortar by adding chemically treated luffa fibres
Publisher: Elsevier BV
Date: 11-2014
A stretchable sandwich panel metamaterial with auxetic rotating-square surface
Publisher: Elsevier BV
Date: 08-2023
Maximizing the effective Young's modulus of a composite material by exploiting the Poisson effect
Publisher: Elsevier BV
Date: 10-2016
Overview of alliancing research and practice in the construction industry
Publisher: Informa UK Limited
Date: 05-2012
Optimal topology design of industrial structures using an evolutionary algorithm
Publisher: Springer Science and Business Media LLC
Date: 12-01-2011
A Kirigami Approach to Forming a Synthetic Buckliball
Publisher: Springer Science and Business Media LLC
Date: 09-09-2016
DOI: 10.1038/SREP33016
Abstract: The shape transformation of some biological systems inspires scientists to create sophisticated structures at the nano- and macro- scales. However, to be useful in engineering, the mechanics of governing such a spontaneous, parallel and large deformation must be well understood. In this study, a kirigami approach is used to fold a bilayer planar sheet featuring a specific pattern into a buckliball under a certain thermal stimulus. Importantly, this prescribed spherical object can retract into a much smaller sphere due to constructive buckling caused by radially inward displacement. By minimizing the potential strain energy, we obtain a critical temperature, below which the patterned sheet exhibits identical principal curvatures everywhere in the self-folding procedure and above which buckling occurs. The applicability of the theoretical analysis to the self-folding of sheets with a ersity of patterns is verified by the finite element method.
Underground excavation shape optimization considering material nonlinearities
Publisher: Elsevier BV
Date: 05-2014
A simple checkerboard suppression algorithm for evolutionary structural optimization
Publisher: Springer Science and Business Media LLC
Date: 10-2001
An unusual stability property of a direct integration algorithm
Publisher: Elsevier BV
Date: 05-1996
Evolutionary structural optimization for dynamic problems
Publisher: Elsevier BV
Date: 03-1996
Investigation of various methods for minimising uneven displacements in pedestrian concrete pavements
Publisher: Informa UK Limited
Date: 30-06-2010
Topology optimization for maximizing buckling strength using a linear material model
Publisher: Elsevier BV
Date: 12-2023
Reducing the Number of Different Faces in Free-Form Surface Approximations Through Clustering and Optimization
Publisher: Elsevier BV
Date: 2024
Determination of an optimal topology with a predefined number of cavities
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 04-2002
DOI: 10.2514/2.1706
Static and dynamic properties of a perforated metallic auxetic metamaterial with tunable stiffness and energy absorption
Publisher: Elsevier BV
Date: 06-2022
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View Funded ActivityResearch Networks - Grant ID: RN0459557
Start Date: 12-2004
End Date: 12-2010
Amount: $1,950,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP140100607
Start Date: 06-2015
End Date: 06-2018
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivitySpecial Research Initiatives - Grant ID: SR0354781
Start Date: 01-2004
End Date: 12-2003
Amount: $40,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0560408
Start Date: 2005
End Date: 12-2008
Amount: $180,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP140100213
Start Date: 2014
End Date: 12-2017
Amount: $323,175.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP1094403
Start Date: 2010
End Date: 2014
Amount: $325,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP1094401
Start Date: 2010
End Date: 2014
Amount: $270,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0665744
Start Date: 2006
End Date: 03-2010
Amount: $435,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE130100120
Start Date: 07-2013
End Date: 12-2016
Amount: $490,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE180100073
Start Date: 03-2018
End Date: 12-2019
Amount: $468,474.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0228785
Start Date: 12-2002
End Date: 06-2006
Amount: $67,635.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0989424
Start Date: 08-2009
End Date: 07-2012
Amount: $243,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0668231
Start Date: 04-2006
End Date: 04-2009
Amount: $234,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP150100906
Start Date: 06-2016
End Date: 12-2019
Amount: $387,500.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0211041
Start Date: 10-2002
End Date: 06-2005
Amount: $165,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0663184
Start Date: 2006
End Date: 12-2008
Amount: $260,000.00
Funder: Australian Research Council
View Funded ActivityAustralian Laureate Fellowships - Grant ID: FL190100014
Start Date: 02-2020
End Date: 02-2025
Amount: $2,871,982.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE210100019
Start Date: 08-2021
End Date: 12-2024
Amount: $664,580.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE110100052
Start Date: 07-2011
End Date: 2015
Amount: $870,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0208977
Start Date: 2002
End Date: 12-2005
Amount: $170,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP160101400
Start Date: 2016
End Date: 11-2019
Amount: $305,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE170100168
Start Date: 2017
End Date: 12-2019
Amount: $458,000.00
Funder: Australian Research Council
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