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Three-dimensional real structure-based finite element analysis of mechanical behavior for porous titanium manufactured by a space holder method

Authors :
Jiwon Jeong
Chong Soo Lee
Sang Ho Oh
Jaimyun Jung
Duu-Jong Lee
Marat I. Latypov
Byounggab Lee
Hyoung Seop Kim
Source :
Computational Materials Science. 100:2-7
Publication Year :
2015
Publisher :
Elsevier BV, 2015.

Abstract

In this study, porous titanium samples were manufactured by a space holder method with sodium chloride. Each porous titanium sample contained two types of pores based on their sizes: macropores and micropores. Macropores were those emerged from removing the space holder, whereas micropores were voids created during powder compaction. The porous titanium exhibited low elastic modulus close to that of the human bone. Computed tomography (CT) was employed to examine the porous structure of the Ti samples. The CT results were then used in finite element simulations for analysis of the mechanical behavior of the porous titanium. The CT-based finite element model was found to give better results compared to the unit-cell finite element model in terms of agreement with the experimental data. The CT model combined with the strain hardening behavior of Ti having micropores prescribed to the matrix allowed for accurate predictions of elastic modulus, yield strength, and flow stress. These results signify the importance of taking into account pores at different scales as well as their morphology and distribution at least at macroscale.

Details

ISSN :
09270256
Volume :
100
Database :
OpenAIRE
Journal :
Computational Materials Science
Accession number :
edsair.doi...........abf2b370784fde140432ba9394cab0f7
Full Text :
https://doi.org/10.1016/j.commatsci.2014.10.020