Application of Cellular Material in Crashworthiness Applications: An Overview

Baroutaji, Ahmad; Arjunan, Arun; Niknejad, Abbas; Tran, TrongNhan; Olabi, Abdul–Ghani

doi:10.1016/b978-0-12-803581-8.09268-7

Cited by 27 publications

(18 citation statements)

References 85 publications

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“…The solid phase consists of a network of struts often referred to as lattices or cells. Cellular solids are typically characterised by UCs with certain symmetry elements [63]. According to Ashby [64], modelling UCs at milli or micrometer-scale allows the overall solid to be considered both as structures and as materials.…”

Section: Scaffold Designmentioning

confidence: 99%

Mechanical performance of highly permeable laser melted Ti6Al4V bone scaffolds

Arjunan

Demetriou

Baroutaji

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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125

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Critically engineered stiffness and strength of a scaffold are crucial for managing maladapted stress concentration and reducing stress shielding. At the same time, suitable porosity and permeability are key to facilitate biological activities associated with bone growth and nutrient delivery. A systematic balance of all these parameters are required for the development of an effective bone scaffold. Traditionally, the approach has been to study each of these parameters in isolation without considering their interdependence to achieve specific properties at a certain porosity. The purpose of this study is to undertake a holistic investigation considering the stiffness, strength, permeability, and stress concentration of six scaffold architectures featuring a 68.46-90.98% porosity. With an initial target of a tibial host segment, the permeability was characterised using Computational Fluid Dynamics (CFD) in conjunction with Darcy's law. Following this, Ashby's criterion, experimental tests, and Finite Element Method (FEM) were employed to study the mechanical behaviour and their interdependencies under uniaxial compression. The FE model was validated and further extended to study the influence of stress concentration on both the stiffness and strength of the scaffolds. The results showed that the pore shape can influence permeability, stiffness, strength, and the stress concentration factor of Ti6Al4V bone scaffolds. Furthermore, the numerical results demonstrate the effect to which structural performance of highly porous scaffolds deviate, as a result of the Selective Laser Melting (SLM) process. In addition, the study demonstrates that stiffness and strength of bone scaffold at a targeted porosity is linked to the pore shape and the associated stress concentration allowing to exploit the design freedom associated with SLM.

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Section: Scaffold Designmentioning

confidence: 99%

Mechanical performance of highly permeable laser melted Ti6Al4V bone scaffolds

Arjunan

Demetriou

Baroutaji

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

Self Cite

125

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“…The specific energy absorption (SEA) is calculated dividing EA by the mass of the energy absorber. This is a critical factor to be considered in order to obtain lighter structures 3,13 …”

Section: Methodsmentioning

confidence: 99%

Simulation of the behavior of lattice structured impact absorbers manufactured by additive manufacturing

Veloso

2021

Mat Design & Process Comms

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Thin‐walled tubes are widely used as impact absorbers in transportation structures, due to their high efficiency in absorbing longitudinal impact loads. This study focuses on the investigation of the effect of squared lattice infill in the crashworthiness efficiency of thin‐walled aluminum tube. The tube and infill were modeled as an additively manufactured integrated part. Impact analysis was performed using finite element method (FEM), considering empty and filled tubes with different combinations of thicknesses for tube walls and lattice structure. The inclusion of lattice infill changed the crashworthiness efficiency of the energy absorber. Filled tubes presented increased energy absorption and higher values of peak and mean force levels. Tube crushing mode and crushing efficiency were also affected by infill configuration.

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“…Simply assuming a homogenous part and characterising the mechanical response can lead to inaccurate conclusions; a case simply not considered in numerous − structures [119][120][121]. One of the most common AM techniques for metals is selective laser melting (SLM) [122], which is increasingly being used in the automotive [123] and space industries [124]. Accordingly, this study exploits the use of SLM to manufacture AlSi10Mg thin/thick-walled structures, where part quality is considered as part of the mechanical characterisation.…”

Section: Introductionmentioning

confidence: 99%