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Proceedings Paper

Soft tissue strain measurement using an optical method
Author(s): Siew Lok Toh; Cho Jui Tay; Cho Hong James Goh
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Paper Abstract

Digital image correlation (DIC) is a non-contact optical technique that allows the full-field estimation of strains on a surface under an applied deformation. In this project, the application of an optimized DIC technique is applied, which can achieve efficiency and accuracy in the measurement of two-dimensional deformation fields in soft tissue. This technique relies on matching the random patterns recorded in images to directly obtain surface displacements and to get displacement gradients from which the strain field can be determined. Digital image correlation is a well developed technique that has numerous and varied engineering applications, including the application in soft and hard tissue biomechanics. Chicken drumstick ligaments were harvested and used during the experiments. The surface of the ligament was speckled with black paint to allow for correlation to be done. Results show that the stress-strain curve exhibits a bi-linear behavior i.e. a "toe region" and a "linear elastic region". The Young's modulus obtained for the toe region is about 92 MPa and the modulus for the linear elastic region is about 230 MPa. The results are within the values for mammalian anterior cruciate ligaments of 150-300 MPa.

Paper Details

Date Published: 25 August 2009
PDF: 4 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737559 (25 August 2009); doi: 10.1117/12.839336
Show Author Affiliations
Siew Lok Toh, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)
Cho Hong James Goh, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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