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

Thibbotuwawa, Namal, Oloyede, Adekunle, Senadeera, Wijitha, & Gu, YuanTong (2014) Hyperelastic constitutive relationship for the strain-rate dependent behavior of shoulder and other joint cartilages. In Goh, James (Ed.) IFMBE Proceedings : The 15th International Conference on Biomedical Engineering, Springer International Publishing, Singapore, pp. 255-258.

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Abstract

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 behavior 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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ID Code: 65803
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Articular cartilage, Constitutive relationship, Hyperelasticity, Strain-rate
DOI: 10.1007/978-3-319-02913-9_65
ISBN: 9783319029139
ISSN: 1680-0737
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 09 Jan 2014 00:59
Last Modified: 07 Apr 2014 02:33

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