ORCID Profile
0000-0002-2338-0101
Current Organisation
RMIT University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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)
Manufacturing Processes and Technologies (excl. Textiles) | Metals and Alloy Materials | Manufacturing Engineering | Numerical Modelling and Mechanical Characterisation | Aerospace structures | Additive manufacturing | Manufacturing engineering | Materials Engineering | Nonlinear Optics and Spectroscopy | Metals and alloy materials |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Metals (e.g. Composites, Coatings, Bonding) | Expanding Knowledge in the Physical Sciences | Structural Metal Products | Basic Aluminium Products | Expanding Knowledge in Technology
Related Links
Publications
Deep drawing behaviour of ultrafine grained copper: modelling and experiment
Publisher: Springer Science and Business Media LLC
Date: 07-2009
Machining of coarse grained and ultra fine grained titanium
Publisher: Springer Science and Business Media LLC
Date: 23-02-2012
Extrusion 3D bioprinting of functional self-supporting neural constructs using a photoclickable gelatin bioink.
Publisher: IOP Publishing
Date: 06-2022
Abstract: Many
Percolation mechanism of failure of a planar assembly of interlocked osteomorphic elements
Publisher: Elsevier BV
Date: 05-2007
Microstructure and mechanical properties of Ti-15Zr alloy used as dental implant material
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.JMBBM.2016.05.008
Abstract: Ti-Zr alloys have recently started to receive a considerable amount of attention as promising materials for dental applications. This work compares mechanical properties of a new Ti-15Zr alloy to those of commercially pure titanium Grade4 in two surface conditions - machined and modified by sand-blasting and etching (SLA). As a result of significantly smaller grain size in the initial condition (1-2µm), the strength of Ti-15Zr alloy was found to be 10-15% higher than that of Grade4 titanium without reduction in the tensile elongation or compromising the fracture toughness. The fatigue endurance limit of the alloy was increased by around 30% (560MPa vs. 435MPa and 500MPa vs. 380MPa for machined and SLA-treated surfaces, respectively). Additional implant fatigue tests showed enhanced fatigue performance of Ti-15Zr over Ti-Grade4.
Improvement of sound absorption and flexural compliance of porous alumina-mullite ceramics by engineering the microstructure and segmentation into topologically interlocked blocks
Publisher: Elsevier BV
Date: 11-2013
Architectured Polymeric Materials Produced by Additive Manufacturing
Publisher: Springer International Publishing
Date: 2019
Comparison of different extrusion methods for compaction of powders
Publisher: Trans Tech Publications, Ltd.
Date: 12-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.667-669.57
Abstract: Densification of metallic powders by means of extrusion is regarded as a very attractive processing technique that allows obtaining a high level of relative density of the compact. However, the uniformity of the relative density depends on that of strain distribution and on the processing parameters. Several variants of extrusion can be used for compaction of metal particulates, including the conventional extrusion (CE) and equal channel angular pressing (ECAP), often referred to as equal-channel angular extrusion. Each of these processes has certain advantages and drawbacks with respect to compaction. A comparative study of these two extrusion processes influencing the relative density of compacts has been conducted by numerical simulation using commercial finite element software DEFORM2D. The results have been validated by experiments with titanium and magnesium powders and chips.
Deformation mechanics of non-planar topologically interlocked assemblies with structural hierarchy and varying geometry
Publisher: Springer Science and Business Media LLC
Date: 19-09-2017
DOI: 10.1038/S41598-017-12147-3
Abstract: Structural hierarchy is known to enhance the performance of many of Nature’s materials. In this work, we apply the idea of hierarchical structure to topologically interlocked assemblies, obtained from measurements under point loading, undertaken on identical discrete block ensembles with matching non-planar surfaces. It was demonstrated that imposing a hierarchical structure adds to the load bearing capacity of topological interlocking assemblies. The deformation mechanics of these structures was also examined numerically by finite element analysis. Multiple mechanisms of surface contact, such as slip and tilt of the building blocks, were hypothesised to control the mechanical response of topological interlocking assemblies studied. This was confirmed using as a model a newly designed interlocking block, where slip was suppressed, which produced a gain in peak loading. Our study highlights the possibility of tailoring the mechanical response of topological interlocking assemblies using geometrical features of both the element geometry and the contact surface profile.
Internally architectured materials with directionally asymmetric friction
Publisher: Springer Science and Business Media LLC
Date: 04-06-2015
DOI: 10.1038/SREP10732
Abstract: Internally Architectured Materials (IAMs) that exhibit different friction forces for sliding in the opposite directions are proposed. This is achieved by translating deformation normal to the sliding plane into a tangential force in a manner that is akin to a toothbrush with inclined bristles. Friction asymmetry is attained by employing a layered material or a structure with parallel ‘ribs’ inclined to the direction of sliding. A theory of directionally asymmetric friction is presented, along with prototype IAMs designed, fabricated and tested. The friction anisotropy (the ξ-coefficient) is characterised by the ratio of the friction forces for two opposite directions of sliding. It is further demonstrated that IAM can possess very high levels of friction anisotropy, with ξ of the order of 10. Further increase in ξ is attained by modifying the shape of the ribs to provide them with directionally dependent bending stiffness. Prototype IAMs produced by 3D printing exhibit truly giant friction asymmetry, with ξ in excess of 20. A novel mechanical rectifier, which can convert oscillatory movement into unidirectional movement by virtue of directionally asymmetric friction, is proposed. Possible applications include locomotion in a constrained environment and energy harvesting from oscillatory noise and vibrations.
Role of shear in interface formation of aluminium-steel multilayered composite sheets
Publisher: Elsevier BV
Date: 09-2017
Novel microstructural features of selective laser melted lattice struts fabricated with single point exposure scanning
Publisher: Elsevier BV
Date: 10-2019
Proving the viability of manufacturing of multi-layer steel/vanadium alloy/steel composite tubes by numerical simulations and experiment
Publisher: Elsevier BV
Date: 05-2018
Sandwich Panels with a Core Segmented into Topologically Interlocked Elements
Publisher: Wiley
Date: 02-04-2013
Equal channel angular pressing with rotating shear plane to produce hybrid materials with helical architecture of constituents
Publisher: Springer Science and Business Media LLC
Date: 11-09-2017
DOI: 10.1557/JMR.2017.339
Strain gradient plasticity modelling of high-pressure torsion
Publisher: Elsevier BV
Date: 04-2008
Interface Formation in Copper-Steel Multilayered Sheets under Severe Shear Strain
Publisher: Wiley
Date: 22-03-2019
Influence of protective pad integrated into sport compression garments on their pressure delivery to athlete's lower limbs
Publisher: Elsevier BV
Date: 2013
Possibility to Predict Extrusion Die Incidental Fracture by Finite Element Simulation
Publisher: Wiley
Date: 21-12-2016
The effect of Cu-based core-sheath configurations on the processing of Nd-Fe-B-based permanent magnets via equal-channel angular pressing
Publisher: IOP Publishing
Date: 05-2017
Precipitation behaviour and mechanical properties of a novel Al0.5MoTaTi complex concentrated alloy
Publisher: Elsevier BV
Date: 12-2019
A constitutive model of the deformation behaviour of twinning induced plasticity (TWIP) steel at different temperatures
Publisher: Elsevier BV
Date: 09-2014
Investigation of Material Flow During Linear Flow Splitting Using Tracer Diffusion Experiments and Finite‐Element Simulations
Publisher: Wiley
Date: 17-03-2021
Abstract: The deformation behavior and evolution of strain distributions of flat metal sheets subjected to the high‐strain forming process of linear flow splitting (LFS) are studied using experimental and numerical techniques. The new tracer gradient method for the mapping of material flow based on diffusional concentration gradients is proposed. The method is validated using theoretical predictions for rolling of a sheet and shown to overcome the limitations of previous techniques. A parametric finite‐element model for LFS of a HC800LA grade steel is developed and validated against the results of the tracer gradient method. A sensitivity study is undertaken to investigate the effects of strain‐hardening behavior and sheet thicknesses on the LFS process. A good agreement between experimental and numerical results is obtained, with the friction between rolls and sheet found to be a critical parameter in the modeling of the process. It is further observed that the formation of the characteristic steady state in the LFS process is linked to the material‐hardening behavior and not the geometry of the sheet.
Enhanced Mechanical Performance of Bio-Inspired Hybrid Structures Utilising Topological Interlocking Geometry
Publisher: Springer Science and Business Media LLC
Date: 24-05-2016
DOI: 10.1038/SREP26706
Abstract: Structural composites inspired by nacre have emerged as prime exemplars for guiding materials design of fracture-resistant, rigid hybrid materials. The intricate microstructure of nacre, which combines a hard majority phase with a small fraction of a soft phase, achieves superior mechanical properties compared to its constituents and has generated much interest. However, replicating the hierarchical microstructure of nacre is very challenging, not to mention improving it. In this article, we propose to alter the geometry of the hard building blocks by introducing the concept of topological interlocking. This design principle has previously been shown to provide an inherently brittle material with a remarkable flexural compliance. We now demonstrate that by combining the basic architecture of nacre with topological interlocking of discrete hard building blocks, hybrid materials of a new type can be produced. By adding a soft phase at the interfaces between topologically interlocked blocks in a single-build additive manufacturing process, further improvement of mechanical properties is achieved. The design of these fabricated hybrid structures has been guided by computational work elucidating the effect of various geometries. To our knowledge, this is the first reported study that combines the advantages of nacre-inspired structures with the benefits of topological interlocking.
Surface improvement of laser powder bed fusion processed Ti6Al4V for fatigue applications
Publisher: Elsevier BV
Date: 12-2022
Osteogenic Potential of Additively Manufactured TiTa Alloys
Publisher: American Chemical Society (ACS)
Date: 03-01-2021
Low-cycle fatigue performance of remelted laser powder bed fusion (L-PBF) biomedical Ti25Ta
Publisher: Elsevier BV
Date: 11-2020
Evaluation of the mechanical compatibility of additively manufactured porous Ti–25Ta alloy for load-bearing implant applications
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.JMBBM.2019.05.019
Abstract: Integrating porous networks in load-bearing implants is essential in order to improve mechanical compatibility with the host tissue. Additive manufacturing has enabled the optimisation of the mechanical properties of metallic biomaterials, notably with the use of novel periodic regular geometries as porous structures. In this work, we successfully produced solid and lattice structures made of Ti-25Ta alloy with selective laser melting (SLM) using a Schwartz primitive unit-cell for the first time. The manufacturability and repeatability of the process was assessed through macrostructural and microstructural observations along with compressive testing. The mechanical properties are found to be suitable for bone replacement applications, showing significantly reduced elastic moduli, ranging from 14 to 36 GPa depending on the level of porosity. Compared to the conventionally used biomedical Ti-6Al-4V alloy, the Ti-Ta alloy offers superior mechanical compatibility for the targeted applications with lower elastic modulus, similar strength and higher ductility, making the Ti-25Ta alloy a promising candidate for a new generation of load-bearing implants.
Low temperature texture development in Nd2Fe14B/α-Fe nanocomposite magnets via equal channel angular pressing
Publisher: AIP Publishing
Date: 05-01-2018
DOI: 10.1063/1.5006359
Abstract: While suitable texture has been developed in Nd2Fe14B/α-Fe nanocomposites via thermomechanical processing methods such as die upsetting by incorporating low melting point eutectic Nd-Cu additives, significant grain coarsening occurs during this process due to the high temperature and long timescales involved, resulting in a loss of exchange coupling. Equal channel angular pressing (ECAP) is a severe plastic deformation technique which has been successfully used to produce a suitable texture in single-phase Nd2Fe14B at temperatures on the order of 500°C while preserving grain sizes on the order of 20-30nm. We investigate the development of texture in a commercial Nd2Fe14B/α-Fe nanocomposite alloy with added Nd90Cu10 produced via ECAP and then characterise it using texture x-ray diffraction and magnetic measurements. It is found that initial texture can be developed in this nanocomposite system at T = 520°C via ECAP. The average grain size of Nd2Fe14B as measured via X-ray diffraction after ECAP remains below 50nm with a developed texture. The effect of varying the amount of Nd90Cu10 additive is also investigated. It is found that with decreasing Nd90Cu10, the degree of texture is reduced while the volume fraction of α-Fe increases. This work demonstrates the development of texture in nanocomposite Nd2Fe14B/α-Fe with Nd-Cu additives whilst maintaining a grain size of approximately 50nm.
Size effect on the tensile strength of fine-grained copper
Publisher: Elsevier BV
Date: 12-2008
Design of responsive materials using topologically interlocked elements
Publisher: IOP Publishing
Date: 23-01-2015
CT-based agile 3D printing system for pre-operative planning of orthopaedic surgeries
Publisher: Inderscience Publishers
Date: 2020
Remelt processing and microstructure of selective laser melted Ti25Ta
Publisher: Elsevier BV
Date: 04-2020
Innovative aluminium extrusion: increased productivity through simulation
Publisher: Elsevier BV
Date: 2020
Texture evolution during micro-drawing of ultrafine grained copper
Publisher: Elsevier BV
Date: 07-2010
Effect of energy density on the interface evolution of stainless steel 316L deposited upon INC 625 via directed energy deposition
Publisher: Springer Science and Business Media LLC
Date: 09-06-2020
Experimental and computational analysis of the mechanical properties of composite auxetic lattice structures
Publisher: Elsevier BV
Date: 11-2021
Mechanical Properties and In Vitro Behavior of Additively Manufactured and Functionally Graded Ti6Al4V Porous Scaffolds
Publisher: MDPI AG
Date: 21-03-2018
DOI: 10.3390/MET8040200
Size effects in micro cup drawing
Publisher: Elsevier BV
Date: 07-2012
Gradient structure produced by three roll planetary milling: Numerical simulation and microstructural observations
Publisher: Elsevier BV
Date: 07-2015
Process monitoring and machine learning for defect detection in laser-based metal additive manufacturing
Publisher: Springer Science and Business Media LLC
Date: 13-04-2023
DOI: 10.1007/S10845-023-02119-Y
Abstract: Over the past several decades, metal Additive Manufacturing (AM) has transitioned from a rapid prototyping method to a viable manufacturing tool. AM technologies can produce parts on-demand, repair damaged components, and provide an increased freedom of design not previously attainable by traditional manufacturing techniques. The increasing maturation of metal AM is attracting high-value industries to directly produce components for use in aerospace, automotive, biomedical, and energy fields. Two leading processes for metal part production are Powder Bed Fusion with laser beam (PBF-LB/M) and Directed Energy Deposition with laser beam (DED-LB/M). Despite the many advances made with these technologies, the highly dynamic nature of the process frequently results in the formation of defects. These technologies are also notoriously difficult to control, and the existing machines do not offer closed loop control. In the present work, the application of various Machine Learning (ML) approaches and in-situ monitoring technologies for the purpose of defect detection are reviewed. The potential of these methods for enabling process control implementation is discussed. We provide a critical review of trends in the usage of data structures and ML algorithms and compare the capabilities of different sensing technologies and their application to monitoring tasks in laser metal AM. The future direction of this field is then discussed, and recommendations for further research are provided. Graphical abstract
Enhancement of sound absorption properties using topologically interlocked elements
Publisher: Elsevier BV
Date: 04-2012
Optimal Design for Metal Additive Manufacturing: An Integrated Computational Materials Engineering (ICME) Approach
Publisher: Springer Science and Business Media LLC
Date: 29-01-2020
DOI: 10.1007/S11837-020-04028-4
Abstract: We present our latest results on linking the process–structure–properties–performance (PSPP) chain for metal additive manufacturing (AM), using a multi-scale and multi-physics integrated computational materials engineering (ICME) approach. The abundance of design parameters and the complex relationship between those and the performance of AM parts have so far impeded the widespread adoption of metal AM technologies for structurally critical load-bearing components. To unfold the full potential of metal AM, establishing a full quantitative PSPP linkage is essential. It will not only help in understanding the underlying physics but will also serve as a powerful and effective tool for optimal computational design. In this work, we illustrate an ex le of ICME-based PSPP linkage in metal AM, along with a hybrid physics-based data-driven strategy for its application in the optimal design of a component. Finally, we discuss our outlook for the improvement of each part in the computational linking of the PSPP chain.
Utilisation of artificial neural networks to rationalise processing windows in directed energy deposition applications
Publisher: Elsevier BV
Date: 2021
Mechanical Properties of Topologically Interlocked Structures with Elements Produced by Freeze Gelation of Ceramic Slurries
Publisher: Wiley
Date: 25-01-2012
Responsive materials: A novel design for enhanced machine-augmented composites
Publisher: Springer Science and Business Media LLC
Date: 21-01-2014
DOI: 10.1038/SREP03783
Effect of build height on the properties of large format stainless steel 316L fabricated via directed energy deposition
Publisher: Elsevier BV
Date: 08-2020
The Effect of Heat Accumulation on the Local Grain Structure in Laser-Directed Energy Deposition of Aluminium
Publisher: MDPI AG
Date: 25-09-2022
DOI: 10.3390/MET12101601
Abstract: The energy used to melt the material at each layer during laser-directed energy deposition (L-DED) accumulates in the solidified layers upon layer deposition and leads to an increase in the temperature of the part with an increasing number of layers. This heat accumulation can lead to inhomogeneous solidification conditions, increasing residual stresses and potentially anisotropic mechanical properties due to columnar grain structures. In this work, infrared imaging is applied during the directed energy deposition process to capture the evolution of the temperature field in high spatial and temporal evolutions. Image processing algorithms determined the solidification rate and the temperature gradient in the spatial and temporal evolutions and evidenced their change with the proceeding deposition process. Metallographic analysis proves that these changes significantly affect the local grain structure of the L-DED fabricated parts. The study provides comprehensive quantitative measurements of the change in the solidification variables in local and temporal resolutions. The comprehensive comparison of different parameter combinations reveals that applied power, and especially the frequency of the consecutive deposition of the in idual layers, are the key parameters to adjusting heat accumulation. These findings provide a methodology for optimising L-DED manufacturing processes and tailoring the local microstructure development by controlling heat accumulation.
Related Organisations
Related Funding Activities
Industrial Transformation Research Hubs - Grant ID: IH130100008
Start Date: 03-2015
End Date: 02-2021
Amount: $4,000,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE230100147
Start Date: 2023
End Date: 12-2023
Amount: $450,294.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP150100139
Start Date: 02-2016
End Date: 12-2019
Amount: $164,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE220100150
Start Date: 08-2022
End Date: 07-2023
Amount: $320,000.00
Funder: Australian Research Council
View Funded Activity