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A numerical study on indentation properties of cortical bone tissue: influence of anisotropy
journal contribution
posted on 2015-10-12, 15:39 authored by Murat Demiral, Adel A. Abdel-Wahab, Vadim SilberschmidtVadim SilberschmidtThe 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.
Funding
The authors acknowledge the financial support from EPSRC UK (grant no. EP/G048886/1).
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
ACTA OF BIOENGINEERING AND BIOMECHANICSVolume
17Issue
2Pages
3 - 14 (12)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.Publisher
Wroclaw University of TechnologyVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
This paper is closed access.ISSN
1509-409XPublisher version
Language
- en