2134/19005
Murat Demiral
Murat
Demiral
Adel A. Abdel-Wahab
Adel A.
Abdel-Wahab
Vadim Silberschmidt
Vadim
Silberschmidt
A numerical study on indentation properties of cortical bone tissue: influence of anisotropy
Loughborough University
2015
Finite element analysis
Anisotropy
Oliver-Pharr method
Cortical bone tissue
Indentation
Mechanical Engineering not elsewhere classified
2015-10-12 15:39:51
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/A_numerical_study_on_indentation_properties_of_cortical_bone_tissue_influence_of_anisotropy/9545666
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.