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

Koloushani, Mehrdad; Hedayati, Reza; Sadighi, Mojtaba; Mohammadi-Aghdam, Mohammad

doi:10.3390/jimaging4030049

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

Mehrdad Koloushani

Reza Hedayati

Mojtaba Sadighi

and

Mohammad Mohammadi-Aghdam

Mechanical Engineering department, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran 15875-4413, Iran

Author to whom correspondence should be addressed.

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

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

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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.

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MDPI and ACS Style

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. https://doi.org/10.3390/jimaging4030049

AMA Style

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

Chicago/Turabian Style

Koloushani, Mehrdad, Reza Hedayati, Mojtaba Sadighi, and Mohammad Mohammadi-Aghdam. 2018. "CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact" Journal of Imaging 4, no. 3: 49. https://doi.org/10.3390/jimaging4030049

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

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