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J. Imaging 2018, 4(3), 49; https://doi.org/10.3390/jimaging4030049

CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact

Mechanical Engineering department, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran 15875-4413, Iran
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Received: 23 January 2018 / Revised: 1 March 2018 / Accepted: 1 March 2018 / Published: 4 March 2018
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Abstract

In this study, a new numerical approach based on CT-scan images and finite element (FE) method has been used to predict the mechanical behavior of closed-cell foams under impact loading. Micro-structural FE models based on CT-scan images of foam specimens (elastic-plastic material model with material constants of bulk aluminum) and macro-mechanical FE models (with crushable foam material model with material constants of foams) were constructed. Several experimental tests were also conducted to see which of the two noted (micro- or macro-) mechanical FE models can better predict the deformation and force-displacement curves of foams. Compared to the macro-structural models, the results of the micro-structural models were much closer to the corresponding experimental results. This can be explained by the fact that the micro-structural models are able to take into account the interaction of stress waves with cell walls and the complex pathways the stress waves have to go through, while the macro-structural models do not have such capabilities. Despite their high demand for computational resources, using micro-scale FE models is very beneficial when one needs to understand the failure mechanisms acting in the micro-structure of a foam in order to modify or diminish them. View Full-Text
Keywords: porous biomaterials; low-velocity impact; closed-cell foam; CT-scan; micro-scale FE modeling porous biomaterials; low-velocity impact; closed-cell foam; CT-scan; micro-scale FE modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Koloushani, M.; Hedayati, R.; Sadighi, M.; Mohammadi-Aghdam, M. CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact. J. Imaging 2018, 4, 49.

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