Simulation of the Mechanical Behaviour of a Single Human Trabecula assessed with a Micromechanical Test and Nanoindentation

0364803 - ÚTAM 2012 RIV GB eng C - Conference Paper (international conference)
Jiroušek, Ondřej - Kytýř, Daniel - Kunecký, Jiří - Zlámal, Petr - Doktor, Tomáš - Němeček, J.
Simulation of the Mechanical Behaviour of a Single Human Trabecula assessed with a Micromechanical Test and Nanoindentation.
Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing. Kippen: Civil-Comp Press, 2011 - (B.H.V. Topping; Y. Tsompanakis), s. 238-249. ISBN 978-1-905088-46-1. ISSN 1759-3433.
[International Conference on Civil, Structural and Environmental Engineering Computing /13./. Chania (GR), 06.09.2011-09.09.2011]
R&D Projects: GA ČR(CZ) GAP105/10/2305
Institutional research plan: CEZ:AV0Z20710524
Keywords : trabecular bone * nanoindentation * micromechanical testing * optical strain measurement * constitutive models * finite element modelling
Subject RIV: JJ - Other Materials

The paper presents a comparison between mechanical properties of single human trabeculae obtained by micromechanical testing and those assessed by nanoindentation. Compact uniaxial tension/compression device has been developed for this purpose. The strains at the surface of the sample are measured optically using a high-resolution CCD camera. The strain field is evaluated using image correlation technique. Local micromechanical properties were assessed using nanoindentation. From obtained nanoindentation curves material parameters for elasto--plastic constitutive model with isotropic hardening are identified in a FE simulation of the indentation process. The unknown parameters are identified in a large set of parametric studies in which the response of the model is best-fitted to the experimental curve. Validation of the material model obtained from nanoindentation is presented in simulation of the tensile test of single trabecula.
Permanent Link: http://hdl.handle.net/11104/0006568