The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Characterising the compressive anisotropic properties of analogue bone using optical strain measurement

Characterising the compressive anisotropic properties of analogue bone using optical strain measurement
Characterising the compressive anisotropic properties of analogue bone using optical strain measurement
The validity of conclusions drawn from preclinical tests on orthopaedic devices depends upon accurate characterisation of the support materials: frequently, polymer foam analogues. These materials often display anisotropic mechanical behavior, which may considerably influence computational modelling predictions and interpretation of experiments. Therefore, the present study sought to characterise the anisotropic mechanical properties of a range of commonly used analogue bone materials, using non-contact multi-point optical extensometry method to account for the effects of machine compliance and uneven loading. Testing was conducted on commercially available ‘cellular’, ‘solid’ and ‘open cell’ Sawbone blocks with a range of densities. Solid foams behaved largely isotropically. However, across the available density range of cellular foams, the average Young’s modulus was 23-31% lower (p<0.005) perpendicular to the foaming direction than parallel to it, indicating elongation of cells with foaming. The average Young’s modulus of open celled foams was 25-59% higher (p<0.05) perpendicular to the foaming direction than parallel to it. This is thought to result from solid planes of material that were observed perpendicular to the foaming direction, stiffening the bulk material. The presented data represent a reference to help researchers design, model and interpret tests using these materials.
0954-4119
954-960
Marter, Alexander
10963c2a-2941-40fb-aecf-ecf28be14d28
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fong, Yin Ki (Kiki)
d780ad03-5886-453f-883c-c66392a059e1
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Marter, Alexander
10963c2a-2941-40fb-aecf-ecf28be14d28
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fong, Yin Ki (Kiki)
d780ad03-5886-453f-883c-c66392a059e1
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397

Marter, Alexander, Dickinson, Alexander, Pierron, Fabrice, Fong, Yin Ki (Kiki) and Browne, Martin (2019) Characterising the compressive anisotropic properties of analogue bone using optical strain measurement. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 233 (9), 954-960. (doi:10.1177/0954411919855150).

Record type: Article

Abstract

The validity of conclusions drawn from preclinical tests on orthopaedic devices depends upon accurate characterisation of the support materials: frequently, polymer foam analogues. These materials often display anisotropic mechanical behavior, which may considerably influence computational modelling predictions and interpretation of experiments. Therefore, the present study sought to characterise the anisotropic mechanical properties of a range of commonly used analogue bone materials, using non-contact multi-point optical extensometry method to account for the effects of machine compliance and uneven loading. Testing was conducted on commercially available ‘cellular’, ‘solid’ and ‘open cell’ Sawbone blocks with a range of densities. Solid foams behaved largely isotropically. However, across the available density range of cellular foams, the average Young’s modulus was 23-31% lower (p<0.005) perpendicular to the foaming direction than parallel to it, indicating elongation of cells with foaming. The average Young’s modulus of open celled foams was 25-59% higher (p<0.05) perpendicular to the foaming direction than parallel to it. This is thought to result from solid planes of material that were observed perpendicular to the foaming direction, stiffening the bulk material. The presented data represent a reference to help researchers design, model and interpret tests using these materials.

Text
Pre Print - Author's Original
Download (1MB)
Text
Author Accepted Manuscript - Accepted Manuscript
Available under License Creative Commons Attribution.
Download (1MB)

More information

Submitted date: 26 March 2018
Accepted/In Press date: 11 May 2019
e-pub ahead of print date: 18 June 2019
Published date: 2019

Identifiers

Local EPrints ID: 429564
URI: http://eprints.soton.ac.uk/id/eprint/429564
ISSN: 0954-4119
PURE UUID: b7fe66f7-fdf0-4062-8b00-9c79f1e770a7
ORCID for Alexander Dickinson: ORCID iD orcid.org/0000-0002-9647-1944
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994
ORCID for Martin Browne: ORCID iD orcid.org/0000-0001-5184-050X

Catalogue record

Date deposited: 29 Mar 2019 17:30
Last modified: 26 Nov 2021 02:55

Export record

Altmetrics

Contributors

Author: Fabrice Pierron ORCID iD
Author: Yin Ki (Kiki) Fong
Author: Martin Browne ORCID iD

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.

×