ORCID Profile
0000-0003-2566-0948
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)
Numerical Modelling and Mechanical Characterisation | Solid Mechanics | Mechanical Engineering | Structural Engineering | Civil Engineering | Aerospace Structures | Composite and Hybrid Materials
ANZSRC Socio-Economic Objective (SEO)
Fabricated Metal Products not elsewhere classified | Solar-Photovoltaic Energy | Polymeric Materials (e.g. Paints) | Industrial Construction Design | Civil Construction Design | Machined Metal Products | Scientific Instruments | Structural Metal Products | Expanding Knowledge in Engineering |
Related Links
Publications
Multiobjective topology optimization for finite periodic structures
Publisher: Elsevier BV
Date: 06-2010
Multi-objective optimization of multi-cell tubes with origami patterns for energy absorption
Publisher: Elsevier BV
Date: 02-2018
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.
Unlocking Metamaterial Properties through Multiscale Design
Publisher: Editora Edgard Blücher
Date: 10-2014
On the internal architecture of emergent plants
Publisher: Elsevier BV
Date: 10-2018
A maze-like path generation scheme for fused deposition modeling
Publisher: Springer Science and Business Media LLC
Date: 11-07-2019
A direct approach to controlling the topology in structural optimization
Publisher: Elsevier BV
Date: 2020
Morphological optimization of scorpion telson
Publisher: Elsevier BV
Date: 02-2020
Cuttlebone: Characterisation, Application and Development of Biomimetic Materials
Publisher: Springer Science and Business Media LLC
Date: 09-2012
On the interaction of biological and mechanical factors in leaf vein formation
Publisher: Elsevier BV
Date: 11-2020
Computer-aided design and fabrication of bio-mimetic materials and scaffold micro-structures
Publisher: Trans Tech Publications, Ltd.
Date: 02-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.213.628
Abstract: Computer-aided design (CAD) has proven effective in enabling novel approaches for tissue engineering applications. This paper demonstrates the applicability of various mathematical methods to design and fabricate bio-mimetic materials via two illustrative ex les. Firstly, CAD models of cellular biomaterials that mimic the micro-structure of cuttlefish bone are designed based on the principles of the homogenization method. Secondly, a three-dimensional bi-objective topology optimization approach based upon the inverse homogenization method is used to design scaffold micro-structures with tailored effective stiffness and permeability properties. Consequently, solid free-form fabrication is used to fabricate such cellular bio-mimetic materials, which show a great potential in tissue engineering applications.
Numerical Analysis and Parametric Study of Phononic Band Gap Structures
Publisher: Trans Tech Publications, Ltd.
Date: 07-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.846.120
Abstract: Phononic band gap crystals (PnCs) are periodic composite materials and well known for their novel property that can prohibit the propagation of mechanical waves in certain range of frequency. This paper develops the finite element method to calculate band structures of bi-material phononic crystals. Through finite element analysis, complete band gap for longitudinal and transverse waves are obtained by characterizing the dispersion relation in phononic crystals. Phononic crystals with different inclusion shapes in a square and hexagonal unit cell are investigated to study the influence of unit cell topology on band gap size. For a specific pattern, the existence of complete band gap in relation to the density and Lamé constant modulus of composites is studied and critical density ratio and Lamé constant ratio of inclusions versus base material for opening complete band gap are given. The results provide theoretical guidance for designing phononic crystals in practical applications.
Body-fitted bi-directional evolutionary structural optimization using nonlinear diffusion regularization
Publisher: Elsevier BV
Date: 06-2022
Design optimization of scaffold microstructures using wall shear stress criterion towards regulated flow-induced erosion
Publisher: ASME International
Date: 08-2011
DOI: 10.1115/1.4004918
Abstract: Tissue scaffolds aim to provide a cell-friendly biomechanical environment for facilitating cell growth. Existing studies have shown significant demands for generating a certain level of wall shear stress (WSS) on scaffold microstructural surfaces for promoting cellular response and attachment efficacy. Recently, its role in shear-induced erosion of polymer scaffold has also drawn increasing attention. This paper proposes a bi-directional evolutionary structural optimization (BESO) approach for design of scaffold microstructure in terms of the WSS uniformity criterion, by downgrading highly-stressed solid elements into fluidic elements and/or upgrading lowly-stressed fluidic elements into solid elements. In addition to this, a computational model is presented to simulate shear-induced erosion process. The effective stiffness and permeability of initial and optimized scaffold microstructures are characterized by the finite element based homogenization technique to quantify the variations of mechanical properties of scaffold during erosion. The illustrative ex les show that a uniform WSS is achieved within the optimized scaffold microstructures, and their architectural and biomechanical features are maintained for a longer lifetime during shear-induced erosion process. This study provides a mathematical means to the design optimization of cellular biomaterials in terms of the WSS criterion towards controllable shear-induced erosion.
A nodal‐based evolutionary optimization algorithm for frame structures
Publisher: Wiley
Date: 05-03-2022
DOI: 10.1111/MICE.12834
Abstract: This work proposes a nodal‐based evolutionary design optimization algorithm to design frame structures whose edges are the Delaunay triangulation of homogeneously distributed nodes in the design domain. The remaining nodes can freely sway in the design domain except for the loading nodes and boundary nodes. As a result, it can extend the space of admissible solutions to this optimization problem and reduce the number of design variables. Then, the sensitivity of the objective function, namely, the sum of compliance and its volume, is input into the method of moving asymptotes to update the nodal coordinates and member thickness. The most inefficient node is deleted in each iteration based on the average nodal strain energy until its number reaches a prescribed limit. 2D numerical ex les for the Michell arch, L‐shaped bracket, and Messerschmidt–Bölkow–Blohm beam show that the proposed algorithm can get the optimal structure within a few iterations. Compared with initial configurations in 3D, the optimal crane arm, transmission tower, and aquatic dome have less strain energy and fewer materials, showing a great potential of the proposed method to design actual space frames.
Design of periodic microstructural materials by using evolutionary structural optimization method
Publisher: Trans Tech Publications Ltd.
Date: 09-02-2008
Nonlinear diffusions in topology optimization
Publisher: Springer Science and Business Media LLC
Date: 06-07-2004
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.
A computational investigation into the impact resistance of a precise finite element model derived from micro-CT data of a woodpecker's head
Publisher: Elsevier BV
Date: 12-2020
Characterization and design of 3D scaffolds for biofluidic criteria
Publisher: IEEE
Date: 05-2009
Crashworthiness design for functionally graded foam-filled thin-walled structures
Publisher: Elsevier BV
Date: 03-2010
Design of cellular porous biomaterials for wall shear stress criterion
Publisher: Wiley
Date: 13-09-2010
DOI: 10.1002/BIT.22842
Abstract: The microfluidic environment provided by implanted prostheses has a decisive influence on the viability, proliferation and differentiation of cells. In bone tissue engineering, for instance, experiments have confirmed that a certain level of wall shear stress (WSS) is more advantageous to osteoblastic differentiation. This paper proposes a level-set-based topology optimization method to regulate fluidic WSS distribution for design of cellular biomaterials. The topological boundary of fluid phase is represented by a level-set model embedded in a higher-dimensional scalar function. WSS is determined by the computational fluid dynamics analysis in the scale of cellular base cells. To achieve a uniform WSS distribution at the solid-fluid interface, the difference between local and target WSS is taken as the design criterion, which determines the speed of the boundary evolution in the level-set model. The ex les demonstrate the effectiveness of the presented method and exhibit a considerable potential in the design optimization and fabrication of new prosthetic cellular materials for bioengineering applications.
Buckling‐Induced Assembly of Three‐Dimensional Tunable Metamaterials (Phys. Status Solidi RRL 4/2018)
Publisher: Wiley
Date: 04-2018
Broadband All-angle Negative Refraction by Optimized Phononic Crystals
Publisher: Springer Science and Business Media LLC
Date: 07-08-2017
DOI: 10.1038/S41598-017-07914-1
Abstract: All-angle negative refraction (AANR) of phononic crystals and its frequency range are dependent on mechanical properties of constituent materials and their spatial distribution. So far, it is impossible to achieve the maximum operation frequency range of AANR theoretically. In this paper, we will present a numerical approach for designing a two-dimensional phononic crystal with broadband AANR without negative index. Through analyzing the mechanism of AANR, a topology optimization problem aiming at broadband AANR is established and solved by bi-directional evolutionary structural optimization method. The optimal steel/air phononic crystal exhibits a record AANR range over 20% and its refractive properties and focusing effects are further investigated. The results demonstrate the multifunctionality of a flat phononic slab including superlensing effect near upper AANR frequencies and self-collimation at lower AANR frequencies.
A reaction diffusion-based level set method using body-fitted mesh for structural topology optimization
Publisher: Elsevier BV
Date: 08-2021
Multiscale metamaterials: a new route to isotropic double-negative behaviour at visible frequencies
Publisher: The Optical Society
Date: 03-09-2014
DOI: 10.1364/OE.22.021929
The Cahn-Hilliard Phase-Field Model for Topology Optimization of Solids
Publisher: Springer Netherlands
Computational fracture modelling in bioceramic structures
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.268-270.853
Abstract: Bioceramics have rapidly emerged as one of major biomaterials in modern biomedical applications because of its outstanding biocompatibility. However, one drawback is its low tensile strength and fracture toughness due to brittleness and inherent microstructural defects, which to a certain extent prevents the ceramics from fully replacing metals used as load-bearing prostheses. This paper aims to model the crack initiation and propagation in ceramic fixed partial denture, namely dental bridge, by using two recently developed methods namely continuum-to-discrete element method (CDEM) in ELFEN and extended finite element methods (XFEM) in ABAQUS. Unlike most existing studies that typically required prescriptions of initial cracks, these two new approaches will model crack initiation and propagation automatically. They are applied to a typical prosthodontic ex le, thereby demonstrating their applicability and effectiveness in biomedical applications.
Level-set based topology optimization for electromagnetic dipole antenna design
Publisher: Elsevier BV
Date: 09-2010
Inertia Effect on Buckling-Induced Auxetic Metamaterials
Publisher: SAGE Publications
Date: 06-2015
DOI: 10.1260/2041-4196.6.2.311
Abstract: Auxetic metamaterials have enhanced indentation and penetration resistance due to their high shear strength and modulus. Its auxetic performance under dynamic loading cases is an important property for shields and armour applications. In the present study, compressive tests at different impact velocities on buckling-induced auxetic metamaterials were conducted for two different initial geometries. A photographic technique was applied to measure the Poisson's ratio. When the dynamic data were compared with those of quasi-static experiments, it was found that the negative Poisson's ratio for the buckling-induced metamaterial is sensitive to the rate of loading, while the negative Poisson's ratio for the metamaterial with initial auxetic behaviour is insensitive to the loading rate. It was also found that the deformation pattern is similar to that in the quasi-static loading condition when the impact force measured by the test machine is dominated by the inertia force of the metamaterials.
Microstructure design of biodegradable scaffold and its effect on tissue regeneration
Publisher: Elsevier BV
Date: 08-2011
DOI: 10.1016/J.BIOMATERIALS.2011.03.064
Abstract: Biodegradable scaffolds play a critical role in therapeutic tissue engineering, in which the matrix degradation and tissue ingrowth are of particular importance for determining the ongoing performance of tissue-scaffold system during regenerative process. This paper aims to explore the mechanobiological process within biodegradable scaffolds, where the representative volume element (RVE) is extracted from periodic scaffold micro-architectures as a base-cell design model. The degradation of scaffold matrix is modeled in terms of a stochastic hydrolysis process enhanced by diffusion-controlled autocatalysis and the tissue ingrowth is modeled through the mechano-regulatory theory. By using the finite element based homogenization technique and topology optimization approach, the effective properties of various periodic scaffold structures are obtained. To explore the effect of scaffold design on the mechanobiological evolutions of tissue-scaffold systems, different scaffold architectures are considered for polymer degradation and tissue regeneration. It is found that the different tissues can grow into the degraded voids inside the polymer matrix. It is demonstrated that the design of scaffold architecture has a considerable impact on the tissue regeneration outcome, which exhibits the importance of implementing different criteria in scaffold micro-structural design, before being fabricated via rapid prototyping technique, e.g. solid free-form fabrication (SFF). This study models such an interactive process of scaffold degradation and tissue growth, thereby providing some new insights into design of biodegradable scaffold micro-architecture for tissue engineering.
Designing broad phononic band gaps for in-plane modes
Publisher: Elsevier BV
Date: 03-2018
Human-made corals for marine habitats: Design optimization and additive manufacturing
Publisher: Elsevier BV
Date: 12-2021
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.
Design of graded two-phase microstructures for tailored elasticity gradients
Publisher: Springer Science and Business Media LLC
Date: 08-2008
Synthesis of shape and topology of multi-material structures with a phase-field method
Publisher: Springer Science and Business Media LLC
Date: 2004
Simple and effective strategies for achieving diverse and competitive structural designs
Publisher: Elsevier BV
Date: 07-2019
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.
A 172-line Matlab code for structural topology optimization in the body-fitted mesh
Publisher: Springer Science and Business Media LLC
Date: 26-12-2022
Characterization of cuttlebone for a biomimetic design of cellular structures
Publisher: Springer Science and Business Media LLC
Date: 12-11-2010
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.
A reaction–diffusion based level set method for image segmentation in three dimensions
Publisher: Elsevier BV
Date: 11-2020
Re-entrant auxetic lattices with enhanced stiffness: A numerical study
Publisher: Elsevier BV
Date: 07-2020
Design of 3-D periodic metamaterials for electromagnetic properties
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2010
On hybrid cellular materials based on triply periodic minimal surfaces with extreme mechanical properties
Publisher: Elsevier BV
Date: 12-2019
High-speed spinning disks on flexible threads
Publisher: Springer Science and Business Media LLC
Date: 13-10-2017
DOI: 10.1038/S41598-017-13137-1
Abstract: A common spinning toy, called “buzzer”, consists of a perforated disk and flexible threads. Despite of its simple construction, a buzzer can effectively transfer translational motions into high-speed rotations. In the present work, we find that the disk can be spun by hand at an extremely high rotational speed, e.g., 200,000 rpm, which is much faster than the previously reported speed of any manually operated device. We explore, both experimentally and theoretically, the detailed mechanics and potential applications of such a thread–disk system. The theoretical prediction, validated by experimental measurements, can help design and optimize the system for, e.g., easier operation and faster rotation. Furthermore, we investigate the synchronized motion of multiple disks spinning on a string. Distinctly different twist waves can be realized by the multi-disk system, which could be exploited in the control of mechanical waves. Finally, we develop two types of manually-powered electric generators based on the thread–disk system. The high-speed rotation of the rotors enables a pulsed high current, which holds great promise for potential applications in, for instance, generating electricity and harvesting energy from ocean waves and other rhythmic translational motions.
Concurrent topological design of composite thermoelastic macrostructure and microstructure with multi-phase material for maximum stiffness
Publisher: Elsevier BV
Date: 08-2016
Evolutionary topology optimization of periodic composites for extremal magnetic permeability and electrical permittivity
Publisher: Springer Science and Business Media LLC
Date: 31-01-2012
The Design of Functional Gradient Materials with Inverse Homogenization Method
Publisher: Trans Tech Publications, Ltd.
Date: 02-2008
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.32.245
Abstract: This study systemically presents an inverse homogenization method in the design of functional gradient materials, which gained substantial attention recently due to their layer-by-layer defined physical properties. Each layer of these materials is unilaterally constructed by periodically extended microstructural elements (namely base cells), whose effective properties can be decided by the homogenization theory in accordance with the material distribution within the base cell. The design objective is to minimize the summation of the least squares of the difference between corresponded entries in target and effective elasticity tensors. The method of moving asymptote drives the minimization of this positive objective function, which forces the effective values approach to the targets as closely as possible. The sensitivity of the effective elasticity tensors with respect to the design variables is derived from the adjoint variable method and it guides the minimization algorithm efficiently. To guarantee the connectivity between adjacent layers, non-design domains occupied by solid materials acting as connective bars are fixed in the design of base cells. Furthermore, nonlinear diffusion technique is introduced to avoid checkerboard patterns and blur boundaries in the microstructures. A series of two-dimensional ex les targeted for the elasticity tensors with same extreme Poisson ratios but different densities in each layer are illustrated to highlight the computational material design procedure.
Topology optimization for negative permeability metamaterials using level-set algorithm
Publisher: Elsevier BV
Date: 04-2011
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.
Design optimization of functionally graded dental implant for bone remodeling
Publisher: Elsevier BV
Date: 10-2009
A reaction diffusion-based B-spline level set (RDBLS) method for structural topology optimization
Publisher: Elsevier BV
Date: 08-2022
Sensitivity analysis for electromagnetic topology optimization problems
Publisher: IOP Publishing
Date: 06-2014
Crashworthiness design of vehicle by using multiobjective robust optimization
Publisher: Springer Science and Business Media LLC
Date: 24-12-2010
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.
On stiffness of scaffolds for bone tissue engineering-a numerical study
Publisher: Elsevier BV
Date: 06-2010
DOI: 10.1016/J.JBIOMECH.2010.02.020
Abstract: Tissue scaffolds are typically designed and fabricated to match native bone properties. However, it is unclear if this would lead to the best tissue ingrowth outcome within the scaffold as neo-tissue keeps changing the stiffness of entire construct. This paper presents a numerical method to address this issue for design optimization and assessment of tissue scaffolds. The elasticity tensors of two different types of bones are weighted by different multipliers before being used as the targets in scaffold design. A cost function regarding the difference between the effective elasticity tensor, calculated by the homogenization technique, and the target tensor, is minimized by using topology optimization procedure. It is found that different stiffnesses can lead to different remodeling results. The comparison confirms that bone remodeling is at its best when the scaffold elastic tensor matches or is slightly higher than the elastic properties of the host bone.
Novel Negative Poisson’s Ratio Lattice Structures with Enhanced Stiffness and Energy Absorption Capacity
Publisher: MDPI AG
Date: 27-06-2018
DOI: 10.3390/MA11071095
An investigation of water-flow pressure distribution on bridge piers under flood loading
Publisher: Informa UK Limited
Date: 24-12-2018
A level-set procedure for the design of electromagnetic metamaterials
Publisher: Optica Publishing Group
Date: 17-03-2010
DOI: 10.1364/OE.18.006693
Multi-Material Topology Optimization of Structures Using an Ordered Ersatz Material Model
Publisher: Computers, Materials and Continua (Tech Science Press)
Date: 2021
Design of dimpled tubular structures for energy absorption
Publisher: Elsevier BV
Date: 03-2017
Static and dynamic properties of pre-twisted leaves and stalks with varying chiral morphologies
Publisher: Elsevier BV
Date: 2020
Energy absorption of thin-walled tubes with pre-folded origami patterns: Numerical simulation and experimental verification
Publisher: Elsevier BV
Date: 06-2016
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.
Multimaterial structural topology optimization with a generalized Cahn–Hilliard model of multiphase transition
Publisher: Springer Science and Business Media LLC
Date: 18-07-2006
Multi-fidelity optimization for sheet metal forming process
Publisher: Springer Science and Business Media LLC
Date: 30-12-2010
Topological design of structures and composite materials with multiobjectives
Publisher: Elsevier BV
Date: 11-2007
The relation of constant mean curvature surfaces to multiphase composites with extremal thermal conductivity
Publisher: IOP Publishing
Date: 21-09-2007
A path-dependent level set topology optimization with fracture criterion
Publisher: Elsevier BV
Date: 06-2021
Mathematical modeling of degradation for bulk-erosive polymers: Applications in tissue engineering scaffolds and drug delivery systems
Publisher: Elsevier BV
Date: 03-2011
DOI: 10.1016/J.ACTBIO.2010.09.038
Abstract: The degradation of polymeric biomaterials, which are widely exploited in tissue engineering and drug delivery systems, has drawn significant attention in recent years. This paper aims to develop a mathematical model that combines stochastic hydrolysis and mass transport to simulate the polymeric degradation and erosion process. The hydrolysis reaction is modeled in a discrete fashion by a fundamental stochastic process and an additional autocatalytic effect induced by the local carboxylic acid concentration in terms of the continuous diffusion equation. Illustrative ex les of microparticles and tissue scaffolds demonstrate the applicability of the model. It is found that diffusive transport plays a critical role in determining the degradation pathway, whilst autocatalysis makes the degradation size dependent. The modeling results show good agreement with experimental data in the literature, in which the hydrolysis rate, polymer architecture and matrix size actually work together to determine the characteristics of the degradation and erosion processes of bulk-erosive polymer devices. The proposed degradation model exhibits great potential for the design optimization of drug carriers and tissue scaffolds.
A comparison of fast Fourier transform-based homogenization method to asymptotic homogenization method
Publisher: Elsevier BV
Date: 04-2020
Sensitivity analysis of bi-layered ceramic dental restorations
Publisher: Elsevier BV
Date: 02-2012
DOI: 10.1016/J.DENTAL.2011.11.012
Abstract: The reliability and longevity of ceramic prostheses have become a major concern. The existing studies have focused on some critical issues from clinical perspectives, but more researches are needed to address fundamental sciences and fabrication issues to ensure the longevity and durability of ceramic prostheses. The aim of this paper was to explore how "sensitive" the thermal and mechanical responses, in terms of changes in temperature and thermal residual stress of the bi-layered ceramic systems and crown models will be with respect to the perturbation of the design variables chosen (e.g. layer thickness and heat transfer coefficient) in a quantitative way. In this study, three bi-layered ceramic models with different geometries are considered: (i) a simple bi-layered plate, (ii) a simple bi-layer triangle, and (iii) an axisymmetric bi-layered crown. The layer thickness and convective heat transfer coefficient (or cooling rate) seem to be more sensitive for the porcelain fused on zirconia substrate models. The resultant sensitivities indicate a critical importance of the heat transfer coefficient and thickness ratio of core to veneer on the temperature distributions and residual stresses in each model. The findings provide a quantitative basis for assessing the effects of fabrication uncertainties and optimizing the design of ceramic prostheses.
Strength design of porous materials using B-spline based level set method
Publisher: Elsevier BV
Date: 2024
On design of multi-functional microstructural materials
Publisher: Springer Science and Business Media LLC
Date: 06-07-2013
Level-set topology optimization for maximizing fracture resistance of brittle materials using phase-field fracture model
Publisher: Wiley
Date: 09-03-2020
DOI: 10.1002/NME.6340
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 variational level set method for the topology optimization of steady-state Navier-Stokes flow
Publisher: Elsevier BV
Date: 12-2008
A fixed-grid bidirectional evolutionary structural optimization method and its applications in tunnelling engineering
Publisher: Wiley
Date: 2008
DOI: 10.1002/NME.2145
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.
Computational Design for Scaffold Tissue Engineering
Publisher: Springer Berlin Heidelberg
Date: 12-2016
A New Homogenization Formulation for Multifunctional Composites
Publisher: World Scientific Pub Co Pte Lt
Date: 03-2016
DOI: 10.1142/S0219876216400028
Abstract: Periodic microstructural composites have gained considerable attention in material science and engineering attributable to their excellent flexibility in tailoring various desirable physical properties. Conventionally, the finite element technique has been widely used in implementing the homogenization. However, the standard finite element method (FEM) leads to an overly stiff model which sometimes gives unsatisfactory accuracy especially using triangular elements in 2D or tetrahedral elements in 3D with coarse mesh. In this paper, different forms of smoothed finite element method (SFEM) are presented to develop new asymptotic homogenization techniques for analyzing various effective physical properties of periodic microstructural composite materials. A range of multifunctional material ex les, including elastic modulus with multiphase composites, conductivity of thermal and electrical composites, and diffusivity ermeability of 3D tissue scaffold, has exemplified herein to demonstrate that SFEM is able to provide more accurate results using the same set of mesh compared with the standard FEM. In addition, the computational efficiency of SFEM is also higher than that of the standard FEM counterpart.
A nodal-based optimization method for the design of continuous fiber-reinforced structures
Publisher: Elsevier BV
Date: 11-2023
Designing novel structures with hierarchically synchronized deformations
Publisher: Elsevier BV
Date: 03-2018
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.
A microstructure diagram for known bounds in conductivity
Publisher: Springer Science and Business Media LLC
Date: 03-2008
Abstract: Two important analytical means—theoretical bounds and homogenization techniques—have gained increasing attention and led to substantial progress in material research. Nevertheless, there is a lack of relating material microstructures to an entire theoretical bound and exploring the possibility of generating multiple microstructures for each property value. This paper aims to provide a microstructure diagram in relation to “bound B” constructed by translation and Weiner bounds. The inverse homogenization technique is used to seek for the optimal phase distribution within a base cell model to make the effective conductivity approach the “bound B” in two- or three-phase material cases. The design shows that the “bound B” is exactly attainable for two-phase composites even with single-length-scale microstructures. Although the multiphase translations bounds are well known to be asymptotically attainable on some parts, they still appear too roomy to be attained by single-length-scale composites. Our results showed a certain improvement in the attainability of single-length-scale structural composites when compared with new bounds established by [V. Nesi: Proc. R. Soc. Edinburgh Sect. A 125, 1219 (1995)], [V. Cherkaev: Variational Methods for Structural Optimization (Springer Verlag, New York, 2000)], and (N. Albin et al.: Proc. R. Soc. London Ser. A 463, 2031 (2007)]. Applicability of the translation bounds to the composites with high-contrast conductivities of phase compositions is also studied in this paper. Finally, we explore the multiple solutions to the optimal microstructures and categorize them into three classes in line with their topological resemblance, namely, spatially identical, unidirectionally identical, and bidirectionally different solutions.
Optimizing two-level hierarchical particles for thin-film solar cells
Publisher: The Optical Society
Date: 26-02-2013
DOI: 10.1364/OE.21.00A285
The design of functional gradient materials with inverse homogenization method
Publisher: Trans Tech Publications Ltd.
Date: 09-02-2008
Nondestructive characterization of bone tissue scaffolds for clinical scenarios
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.JMBBM.2018.08.034
Abstract: This study aimed to develop a simple and efficient numerical modeling approach for characterizing strain and total strain energy in bone scaffolds implanted in patient-specific anatomical sites. A simplified homogenization technique was developed to substitute a detailed scaffold model with the same size and equivalent orthotropic material properties. The effectiveness of the proposed modeling approach was compared with two other common homogenization methods based on periodic boundary conditions and the Hills-energy theorem. Moreover, experimental digital image correlation (DIC) measurements of full-field surface strain were conducted to validate the numerical results. The newly proposed simplified homogenization approach allowed for fairly accurate prediction of strain and total strain energy in tissue scaffolds implanted in a large femur mid-shaft bone defect subjected to a simulated in-vivo loading condition. The maximum discrepancy between the total strain energy obtained from the simplified homogenization approach and the one obtained from detailed porous scaffolds was 8.8%. Moreover, the proposed modeling technique could significantly reduce the computational cost (by about 300 times) required for simulating an in-vivo bone scaffolding scenario as the required degrees of freedom (DoF) was reduced from about 26 million for a detailed porous scaffold to only 90,000 for the homogenized solid counterpart in the analysis. The simplified homogenization approach has been validated by correlation with the experimental DIC measurements. It is fairly efficient and comparable with some other common homogenization techniques in terms of accuracy. The proposed method is implicating to different clinical applications, such as the optimal selection of patient-specific fixation plates and screw system.
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
Piezoelectric properties of triply periodic minimum surface structures
Publisher: Elsevier BV
Date: 11-2020
Design of fiber metamaterials with negative refractive index in the infrared
Publisher: The Optical Society
Date: 06-07-2015
DOI: 10.1364/OE.23.018236
Pump drill: A superb device for converting translational motion into high-speed rotation
Publisher: Elsevier BV
Date: 10-2017
Computational design of multi-phase microstructural materials for extremal conductivity
Publisher: Elsevier BV
Date: 09-2008
Finite element based bone remodeling and resonance frequency analysis for osseointegration assessment of dental implants
Publisher: Elsevier BV
Date: 08-2011
Microstructural design of connective base cells for functionally graded materials
Publisher: Elsevier BV
Date: 09-2008
Buckling-Induced Assembly of Three-Dimensional Tunable Metamaterials
Publisher: Wiley
Date: 15-02-2018
Computational design of microstructural composites with tailored thermal conductivity
Publisher: Informa UK Limited
Date: 12-09-2008
Creating biomaterials inspired by the microstructure of cuttlebone
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.2229
Abstract: The microstructure of cuttlebone is investigated using Scanning Electron Microscopy (SEM). A graded aspect ratio of the base cells between layers is evident in some s les. A method for designing graded biomaterials mimicking this cuttlebone microstructure is developed. Simplified 3D biomaterial s les are created using CAD software. These biomaterials are fabricated using a stereolithographic apparatus (SLA). The homogenisation technique is used to evaluate the mechanical properties of the original cuttlebone s le and the fabricated biomaterial s le. Good agreement is found between the Young’s moduli of corresponding layers. However, it is inconclusive whether the Young’s moduli have a proportional relationship to the aspect ratio of the base cell at this stage of the study.
Assessing the effects of natural variations in microstructure for the biomimetic modeling of cuttlebone
Publisher: Trans Tech Publications, Ltd.
Date: 08-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.123-125.295
Abstract: Cuttlebone is a natural material possessing a unique microstructure providing a high compressive strength to weight ratio. It is potentially desirable to use cuttlebone directly in engineering applications or to design new biomimetic materials based on the microstructural features of cuttlebone. A finite element based homogenization method can be used for characterizing the mechanical properties of such a biomaterial and for the design of biomimetic materials. However, this method assumes a periodicity of microstructure, which does not reflect the variation present in natural or fabricated materials. The method can be extended to investigate the effect of natural variation and manufacturing tolerance by enlarging the base cell domain to include a number of representative volume elements (RVEs) and applying a random displacement vector to the nodes at the internal intersections of the RVEs. As the boundary of the base cell domain is not modified, the homogenization method can still be employed to calculate the bulk mechanical properties. It is found that the number of RVEs in the base cell has an impact on the decrease in mean stiffness tensor components, while the length of the introduced variation seems to influence both the mean and the standard deviation of stiffness tensor components.
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.
Bioinspired lightweight cellular materials - Understanding effects of natural variation on mechanical properties
Publisher: Elsevier BV
Date: 08-2013
DOI: 10.1016/J.MSEC.2013.03.031
Abstract: Cuttlebone is a natural marine cellular material possessing the exceptional mechanical properties of high compressive strength, high porosity and high permeability. This combination of properties is exceedingly desirable in biomedical applications, such as bone tissue scaffolds. In light of recent studies, which converted raw cuttlebone into hydroxyapatite tissue scaffolds, the impact of morphological variations in the microstructure of this natural cellular material on the effective mechanical properties is explored in this paper. Two extensions of the finite element-based homogenization method are employed to account for deviations from the assumption of periodicity. Firstly, a representative volume element (RVE) of cuttlebone is systematically varied to reflect the large range of microstructural configurations possibly among different cuttlefish species. The homogenization results reveal the critical importance of pillar formation and aspect ratio (height/width of RVE) on the effective bulk and shear moduli of cuttlebone. Secondly, multi-cell analysis domains (or multiple RVE domains) permit the introduction of random variations across neighboring cells. Such random variations decrease the bulk modulus whilst displaying minimal impact on the shear modulus. Increasing the average size of random variations increases the effect on bulk modulus. Also, the results converge rapidly as the size of the analysis domain is increased, meaning that a relatively small multi-cell domain can provide a reasonable approximation of the effective properties for a given set of random variation parameters. These results have important implications for the proposed use of raw cuttlebone as an engineering material. They also highlight some potential for biomimetic design capabilities for materials inspired by the cuttlebone microstructure, which may be applicable in biomedical applications such as bone tissue scaffolds.
Residual stresses in fabrication of core-veneered ceramic prostheses
Publisher: Trans Tech Publications, Ltd.
Date: 03-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.97-101.2241
Abstract: Fabrication of multilayered ceramics signifies an important topic in many advanced applications aerospace and prosthetic dentistry. This paper presents a numerical approach to characterising the transient thermal responses and corresponding thermal residual stresses that are developed in the bi-layered dental ceramic crowns model under a controlled cooling rate from a temperature around its glass transition temperature (typically 550°C) to room temperature (25°C). Finite element method (FEM) is adopted to model the residual stresses in normal or rapid cooling fabrication process. The demonstrative ex les take into account the effect of thickness in core veneered all-ceramic restorative prosthesis (specific porcelain bonded to an alumina or zirconia core layer), cooling rates and mismatches in temperature-dependent material properties such as thermal expansion coefficients, specific heat and Young’s modulus. The model of transient ceramic fabrication processing showed significant potential to development of optimal prosthetic devices.
Double-negative metamaterial from conducting spheres with a high-permittivity shell
Publisher: The Optical Society
Date: 31-07-2014
DOI: 10.1364/OL.39.004587
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