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Title: A numerical study on indentation properties of cortical bone tissue: influence of anisotropy
Authors: Demiral, Murat
Abdel-Wahab, Adel A.
Silberschmidt, Vadim V.
Keywords: Finite element analysis
Anisotropy
Oliver-Pharr method
Cortical bone tissue
Indentation
Issue Date: 2015
Publisher: Wroclaw University of Technology
Citation: DEMIRAL, M., ABDEL-WAHAB, A.A. and SILBERSCHMIDT, V.V., 2015. A numerical study on indentation properties of cortical bone tissue: influence of anisotropy. Acta of Bioengineering and Biomechanics, 17 (2), pp.3-14.
Abstract: The purpose of this study is to investigate the effect of anisotropy of cortical bone tissue on measurement of properties such as direction-dependent moduli and hardness. Methods: An advanced three-dimensional finite element model of microindentation was developed. Different modelling schemes were considered to account for anisotropy of elastic or/and plastic regimes. The elastic anisotropic behaviour was modelled employing an elasticity tensor, and Hill’s criteria were used to represent the direction-dependent post-yield behaviour. The Oliver–Pharr method was used in the data analysis. Results: A decrease in the value of the transverse elasticity modulus resulted in the increased material’s indentation modulus measured in the longitudinal direction and a decreased one in the transverse direction, while they were insensitive to the anisotropy in post-elastic regime. On the other hand, an increase in plastic anisotropy led to a decrease in measured hardness for both directions, but by a larger amount in the transverse one. The size effect phenomenon was found to be also sensitive to anisotropy. Conclusions: The undertaken analysis suggests that the Oliver–Pharr method is a useful tool for first-order approximations in the analysis of mechanical properties of anisotropic materials similar to cortical bone, but not necessarily for the materials with low hardening reserves in the plastic regime.
Description: This paper is closed access.
Sponsor: The authors acknowledge the financial support from EPSRC UK (grant no. EP/G048886/1).
Version: Published
DOI: 10.5277/ABB-00073-2014-03
URI: https://dspace.lboro.ac.uk/2134/19005
Publisher Link: http://dx.doi.org/10.5277/ABB-00073-2014-03
ISSN: 1509-409X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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