A new orthotropic strain energy function is proposed for describing the observed tension-compression non-linearity of the solid matrix of articular cartilage. This proposed function is based in the exponential form used by Cohen  and uses an approach similar to that of Quapp and Weiss  to incorporate the tension-compression non-linearity of the tissue. Under infinitesimal strains it can reduce to the Conewise Linear Elastic (CLE) model of Cumier et al. , or it can allow for a smooth transition between tension and compression.
- Articular cartilage
- Finite deformation
- Tension-compression non-linearity
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