25 August 2009 Soft tissue strain measurement using an optical method
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737559 (2009) https://doi.org/10.1117/12.839336
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
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.
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Siew Lok Toh, Siew Lok Toh, Cho Jui Tay, Cho Jui Tay, Cho Hong James Goh, Cho Hong James Goh, } "Soft tissue strain measurement using an optical method", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737559 (25 August 2009); doi: 10.1117/12.839336; https://doi.org/10.1117/12.839336
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