Region-dependent compressive relaxation behavior of articular cartilage and viscoelastic constitutive model
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Abstract:
Objective: To investigate the compressive relaxation behavior of cartilage in different regions of the knee joint under different strain rates, and construct the viscoelastic mechanics of cartilage in each region, so as to provide a reference for the prevention of cartilage-related diseases and the development of cartilage repair materials. Methods: The knee cartilage of beagle dogs was divided into regions, and the uniaxial unconfined compressive relaxation properties of cartilage in each region were tested by a universal testing machine under different strain rates (5×10-4 s-1、5×10-3 s-1 and 5×10-2 s-1), and the constitutive models were constructed. Results: The results of compressive relaxation tests showed that the cartilage exhibited notable stress attenuation. Furthermore, the normalized stress reduction increased significantly with increasing strain rate, while the relaxation equilibrium stress remained relatively constant for all strain rates. The Ogden-Prony viscoelastic model of cartilage in each region was developed with a goodness of fit R2>0.98. Conclusions: The knee cartilage demonstrates a significant viscoelastic response in relaxation tests, exhibiting the rate-dependent and region-dependent properties. The Ogden-Pony viscoelastic model can reflect the strain rate-dependent stress relaxation behavior of cartilage.
