Indentation Experiments and Simulation of Ovine Bone Using a Viscoelastic-plastic Damage Model

Overview

Journal J Mater Res

Publisher Cambridge University Press

Date 2015 Jul 3

PMID 26136623

Authors

Yang Zhao

Ziheng Wu

Simon Turner

Jennifer MacLeay

Glen L Niebur

Timothy C Ovaert

Affiliations

Soon will be listed here.

Abstract

Indentation methods have been widely used to study bone at the micro- and nanoscales. It has been shown that bone exhibits viscoelastic behavior with permanent deformation during indentation. At the same time, damage due to microcracks is induced due to the stresses beneath the indenter tip. In this work, a simplified viscoelastic-plastic damage model was developed to more closely simulate indentation creep data, and the effect of the model parameters on the indentation curve was investigated. Experimentally, baseline and 2-year postovariectomized (OVX-2) ovine (sheep) bone samples were prepared and indented. The damage model was then applied via finite element analysis to simulate the bone indentation data. The mechanical properties of yielding, viscosity, and damage parameter were obtained from the simulations. The results suggest that damage develops more quickly for OVX-2 samples under the same indentation load conditions as the baseline data.

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