The University of Southampton
University of Southampton Institutional Repository

Local strain and damage mapping in single trabeculae during three-point bending tests

Jungmann, R., Szabo, M. E., Schitter, G., Tang, Raymond Yue-Sing, Vashishth, D., Hansma, P. K. and Thurner, P. J. (2011) Local strain and damage mapping in single trabeculae during three-point bending tests Journal of the Mechanical Behavior of Biomedical Materials, 4, (4), pp. 523-534. (doi:10.1016/j.jmbbm.2010.12.009). (PMID:21396601).

Record type: Article

Abstract

The use of bone mineral density as a surrogate to diagnose bone fracture risk in individuals is of limited value. However, there is growing evidence that information on trabecular microarchitecture can improve the assessment of fracture risk. One current strategy is to exploit finite element analysis (FEA) applied to 3D image data of several mm-sized trabecular bone structures obtained from non-invasive imaging modalities for the prediction of apparent mechanical properties. However, there is a lack of FE damage models, based on solid experimental facts, which are needed to validate such approaches and to provide criteria marking elastic-plastic deformation transitions as well as microdamage initiation and accumulation. In this communication, we present a strategy that could elegantly lead to future damage models for FEA: direct measurements of local strains involved in microdamage initiation and plastic deformation in single trabeculae. We use digital image correlation to link stress whitening in bone, reported to be correlated to microdamage, to quantitative local strain values. Our results show that the whitening zones, i.e. damage formation, in the presented loading case of a three-point bending test correlate best with areas of elevated tensile strains oriented parallel to the long axis of the samples. The average local strains along this axis were determined to be (1.6±0.9)% at whitening onset and (12±4)% just prior to failure. Overall, our data suggest that damage initiation in trabecular bone is asymmetric in tension and compression, with failure originating and propagating over a large range of tensile strains.

Full text not available from this repository.

More information

Published date: May 2011

Identifiers

Local EPrints ID: 185259
URI: http://eprints.soton.ac.uk/id/eprint/185259
ISSN: 1751-6161
PURE UUID: 5dc03d9c-5c60-44da-8d79-7a7de3b091c2

Catalogue record

Date deposited: 10 May 2011 09:21
Last modified: 18 Jul 2017 11:49

Export record

Altmetrics

Contributors

Author: R. Jungmann
Author: M. E. Szabo
Author: G. Schitter
Author: Raymond Yue-Sing Tang
Author: D. Vashishth
Author: P. K. Hansma
Author: P. J. Thurner

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×