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Introduction
Skills and Expertise
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April 2014 - present
November 2012 - April 2014
Publications
Publications (61)
Fibre metal laminates (FMLs) are increasingly employed in various industries for their exceptional mechanical properties. Quasi-static tensile and flexural properties, fatigue performance and impact resistance of FMLs have been extensively investigated in the past. However, research on the intermediate strain rate range is still limited. This paper...
Background
Electroacupuncture (EA) is a modern form of acupuncture therapy where stainless steel acupuncture needles are used as percutaneous electrodes to apply electrical stimulation. The concern about electrolytic corrosion of needles during EA has not been conclusively addressed.
Aim
To examine whether corrosion of stainless steel acupuncture...
In this paper, two new design approaches are proposed to design structural nodes of complex shapes for gridshell structures, seeking improved structural performance and design efficiency by using the transitional section method and the bi-directional evolutionary structural optimization (BESO) method, respectively. Detailed design methodologies are...
In this study the mechanical behaviour of a creased thin strip under opposite-sense bending was investigated.
It was found that a simple crease, which led to the increase of the second moment of area, could
significantly alter the overall mechanical behaviour of a thin strip, for example the peak moment could be increased
by 100 times. The crease w...
Three novel types of multi-cell tubular structures with pre-folded origami patterns were proposed in this paper, aimed at reducing the initial peak force and the crushing force fluctuation while maintaining or increasing the specific energy absorption during uniaxial crush. Experimentally validated finite element modelling was conducted to study th...
This paper presents an extensive numerical study on the impact behaviour of plate-like assemblies made of interlocking concrete bricks. In the proposed 3D finite element model, a damage based concrete model is employed with considerations of strain rate effect and concrete failure criteria. Boundary conditions are appropriately defined to simulate...
The dynamic compressive response of closed-cell (CYMAT™) stabilised aluminium alloy foams (SAF) has been investigated using a modified Split Hopkinson Pressure Bar (SHPB) in conjunction with a high-speed camera. Tests have been carried out on 45 mm diameter and 23 mm thick cylindrical specimens. The elastic-plastic pore collapse mechanism has been...
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 fast...
In this paper, the crushing performance of two novel types of tubular structures with predesigned Yoshimura-pattern and ellipsoidal dimples were studied by using finite element modelling and compared with conventional circular tubes. The influence of structural arrangement of representative structural units and material properties on the mechanical...
In this paper we study a new type of interlocking brick recently proposed by the authors. The brick has a symmetrical geometry with four concavo-convex side surfaces for the interlocking purpose. Drop weight tests have been conducted to investigate the mechanical response of interlocking assembly plates by applying different levels of impact force...
Most studies on composites assume that the constituent phases have different values of stiffness. Little attention has been paid to the effect of constituent phases having distinct Poisson’s ratios. This research focuses on a concurrent optimization method for simultaneously designing composite structures and materials with distinct Poisson’s ratio...
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 multilevel
hierarchies. These new hierarchical structures have remarkably few degrees of freedom compared
to existing designs by other methods. Mor...
![Figure 1. (a) An elementary osteomorphic brick (Autruffe et al. [1]),...](profile/Anooshe-Rezaee-Javan/publication/310596977/figure/fig1/AS:430756582432768@1479711780657/a-An-elementary-osteomorphic-brick-Autruffe-et-al-1-and-b-construction-of-a_Q320.jpg)
Despite the increasing interest in topological interlocking structures made of identical elements, only one type of interlocking brick has been extensively studied so far, with very limited focus on their dynamic behaviour. In this paper, a new design of interlocking brick was proposed, which had a symmetrical geometry with four curved side surface...
Despite the increasing interest in topological interlocking structures made of identical elements, only one type of interlocking brick has been extensively studied so far, with very limited focus on their dynamic behaviour. In this paper, a new design of interlocking brick was proposed, which had a symmetrical geometry with four curved side surface...
The development of porous metals to alleviate the effects of stress shielding in bone will help improve the function of metallic biomaterials in orthopaedic applications. A critical step in advancing this technology is to design metallic structures with low rigidity that is comparable with bone tissue, but with good mechanical strength. In this stu...
Recent studies have shown that the stiffness of composites in one or more directions could increase dramatically when the Poisson’s ratios of constituent phases approach the thermodynamic limits. In this paper, we establish a computational framework for the topology design of the microstructure of a composite material whose constituent phases have...
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...
Thin-walled tubes are widely used as energy absorption components. In this study, two different origami
patterns were introduced to circular tubes. The influence of the origami patterns on the energy absorption capacity and the deformation mechanism of tubes under uniaxial loading were investigated
both numerically and experimentally. The results s...
Recent advances in additive manufacturing make it possible to fabricate periodic lattice structures with complex configurations. However, a proper design strategy to achieve lattice structures with controlled anisotropy is still unavailable. There is an urgent need to fill this knowledge gap in order to develop mechanical metamaterials with prescri...
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...
The present paper details the first extensive study of the dynamic out-of-plane indentation of aluminum honeycombs at a range of different loading velocities. Dynamic and quasi-static mechanical properties of honeycombs were comparatively analyzed to investigate the strain rate effect on both mean plateau stress and energy absorption. Indentation a...
The collision behaviour of three types of circular aluminium rings was experimentally studied in this paper. A specially designed fixture attached to the barrel of an air gun was employed for the lateral impact of flying rings on a rigid target. The force history, deformation mechanisms and rebounding velocity of the rings, as well as their depende...
In this paper, the uniaxial dynamic compressive response and rheological properties of a newly developed commercially available polymer based shear stiffening (PSS) composite is experimentally studied at different crushing velocities. The results showed that the compressive stress of PSS composites increases with the rising strain rates. Comparing...
The strength enhancement of cellular metals including aluminium foams and honeycombs under dynamic compression is experimentally studied in the present paper, with a focus on the intermediate strain rate from 1 to 200 s-1. Previously data in this range are very limited due to the difficulty in the experimental techniques. The plateau stress in rela...
High strength steel alloys are good candidates for many engineering applications particularly those involving high strains and impact loads. Such applications in energy absorption devices require materials that can sustain dynamic loading and remain strong under demanding conditions. But the processing cost of these alloys has been a prohibitive fa...
In this paper, a finite element model was built using ANSYS/LS-DYNA to study the effect of strain rate on the dynamic out-of-plane plateau stress of aluminum honeycombs under constant velocity impact. The strain rates vary from 102 to 104 s-1. It has been found that the t/l ratio (wall thickness to edge length ratio) and strain rate have great infl...
The present work examined the surface conditions and various other physical properties of sterilised single-use stainless steel acupuncture needles from two of the most popular brands widely used in many countries.
Scanning electron microscope (SEM) images were taken for 10 randomly chosen needles from each brand. Further SEM images were taken afte...
The dynamic tensile behaviour of a type of twinning induced plasticity (TWIP) steel was experimentally investigated over a wide range of strain rates from 0.001 to 400 s−1, with an emphasis on the intermediate strain rates (1–400 s−1). It has been found that the TWIP steel has moderate yield stress and remarkable elongation, which was believed to b...
The strength enhancement of cellular materials under dynamic compression was experimentally studied in the present paper. A phenomenological model was employed to investigate the entrapped air contribution by introducing a parameter, namely the leaking rate of air. The strength enhancement caused by the entrapped air was then studied for both alumi...
The out-of-plane crushing behaviour of four types of aluminium hexagonal honeycombs was extensively investigated over a wide range of strain rates where each test was conducted at a constant compressive velocity. The effects of specimen dimensions, relative density, strain rate and honeycomb cell size on the mechanical properties of honeycombs were...
The out-of-plane crushing behaviour of aluminium hexagonal honeycombs containing different percentages of holes (i.e., the fraction of penetrated cells to the total) was extensively investigated over a wide range of strain rates where each test was conducted at constant compression velocity. Strength enhancement due to the increase of the strain ra...
The compressive behavior of two closed cell aluminum foams (Alporas and Cymat) were investigated under various strain rates from 10(-3) to 10(2) s(-1) using compressive tests conducted on MTS and Instron test machines. High speed camera videos show that localized deformation occurs in Alporas foam specimens uniformly, but not in Cymat foams. The st...
A theoretical model on the solvus line prediction of a film was proposed and applied to a nanogranular Al-Cu system. The calculation results show that the solvus line of solute Cu will markedly lower with the decrease of grain size, namely, the starting temperature of θ (Al2Cu) precipitation in a nanogranular Al-Cu film will markedly lower than tha...
A nanostructural surface layer was synthesized on a eutectoid steel by surface mechanical attrition (SMAT) treatment and its microstructure and evolution were characterized by means of X-ray and TEM. The result reveales that the original structure of pearlite consists of alternate thin plates of ferrite and cementite. After subjected to SMAT treatm...
The possibility of Al2Cu(θ) precipitation in nanosized Al-4wt%Cu alloy is predicted based on the theory of homogeneous nucleation. The result indicates that the initial concentration of Cu in parent phase has little influence on the nucleation event when the grain size is larger than a critical size. On the other hand, when the grain size is smalle...
Projects
Projects (5)
Goal: this project is to carry out the study of the dynamic response of the TI-CF FMLs when subjected to impact.
An optimization analysis will be performed for revealing the influence of metal type, metal thickness, fibre volume fraction, fibre direction, stacking sequence and number of layers on the overall behavior of the TI-CF FMLs.
Results of this project are of great scientific significance for better understanding of the TI-CF FMLs and provide a theoretical guidance for their application.
This research is aimed at overcoming these drawbacks by introducing special patterns such as origami and dimple patterns onto the surfaces of conventional tubes. The latest results reveal that through proper designs of the pre-folded origami and dimple tubes, the initial peak force could be significantly decreased without sacrificing the energy absorption capacity. The fluctuation in crushing force could also be significantly lowered.
Reevaluate acupuncture for its safety, efficacy studies, and mechanism basis focusing on the needle tool
