Singh, R., Lee, P. D., Lindley, T. C., Kohlhauser, C., Hellmich, C., Bram, M., Imwinkelried, T. and Dashwood, R. J.. (2010) Characterization of the deformation behavior of intermediate porosity interconnected Ti foams using micro-computed tomography and direct finite element modeling. Acta Biomaterialia, Vol.6 (No.6). pp. 2342-2351. ISSN 1742-7061

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Abstract

Under load-bearing conditions metal-based foam scaffolds are currently the preferred choice as bone/cartilage implants. In this study X-ray micro-computed tomography was used to discretize the three-dimensional structure of a commercial titanium foam used in spinal fusion devices. Direct finite element modeling, continuum micromechanics and analytical models of the foam were employed to characterize the elasto-plastic deformation behavior. These results were validated against experimental measurements, including ultrasound and monotonic and interrupted compression testing. Interrupted compression tests demonstrated localized collapse of pores unfavorably oriented with respect to the loading direction at many isolated locations, unlike the Ashby model, in which pores collapse row by row. A principal component analysis technique was developed to quantify the pore anisotropy which was then related to the yield stress anisotropy, indicating which isolated pores will collapse first. The Gibson Ashby model was extended to incorporate this anisotropy by considering an orthorhombic, rather than a tetragonal, unit cell. It is worth noting that the natural bone is highly anisotropic and there is a need to develop and characterize anisotropic implants that mimic bone characteristics. (C) 2009 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Acta Biomaterialia
Publisher:	Elsevier BV
ISSN:	1742-7061
Date:	June 2010
Volume:	Vol.6
Number:	No.6
Number of Pages:	10
Page Range:	pp. 2342-2351
Identification Number:	10.1016/j.actbio.2009.11.032
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), European Community Marie Curie Fellowship
Grant number:	GR/T26344 (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/5798

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