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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|
Cortical bone tissue
|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
|Description: ||This paper is closed access.|
|Sponsor: ||The authors acknowledge the financial support from EPSRC
UK (grant no. EP/G048886/1).|
|Publisher Link: ||http://dx.doi.org/10.5277/ABB-00073-2014-03|
|Appears in Collections:||Closed Access (Mechanical, Electrical and Manufacturing Engineering)|
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