Hyperelastic constitutive relationship for the strain-rate dependent behavior of shoulder and other joint cartilages

Thibbotuwawa, N. and Oloyede, A. and Senadeera, W. and Gu, Y. T. (2014) Hyperelastic constitutive relationship for the strain-rate dependent behavior of shoulder and other joint cartilages. In: 15th International Conference on Biomedical Engineering (ICBME 2013) , 4-7 Dec 2013, Singapore.


Non-linear finite deformations of articular cartilages under physiological loading conditions can be attributed to hyperelastic behavior. This paper contains experimental results of indentation tests in finite deformation and proposes an empirical based new generalized hyperelastic constitutive model to account for strain-rate dependency for humeral head cartilage tissues. The generalized model is based on existing hyperelastic constitutive relationships that are extensively used to represent biological tissues in biomechanical literature. The experimental results were obtained for three loading velocities, corresponding to low (1x10-3 s-1), moderate and high strain-rates (1x10-1 s-1), which represent physiological loading rates that are experienced in daily activities such as lifting, holding objects and sporting activities. Hyperelastic material parameters were identified by non-linear curve fitting procedure. Analysis demonstrated that the material behaviour of cartilage can be effectively decoupled into strain-rate independent (elastic) and dependent parts. Further, experiments conducted using different indenters indicated that the parameters obtained are significantly affected by the indenter size,potentially due to structural inhomogeneity of the tissue. The hyperelastic constitutive model developed in this paper opens a new avenue for the exploration of material properties of cartilage tissues.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 10 Feb 2017 00:40
Last Modified: 27 Feb 2017 01:16
Uncontrolled Keywords: articular cartilage, constitutive relationship, hyperelasticity, strain-rate, cartilage material properties
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1007/978-3-319-02913-9_65
URI: http://eprints.usq.edu.au/id/eprint/30558

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