Observations in compression tests of articular cartilage have revealed unequal load increments for compression and release of the same amplitude applied to a disk with an identical previously imposed compression (in equilibrium). The mechanism of this asymmetric transient response is investigated here using a nonlinear fibril-reinforced model. It is found that the asymmetry is predominantly produced by the fibril stiffening with its tensile strain. In addition, allowing the hydraulic permeability to decrease significantly with compressive dilatation of cartilage increases the transient fibril strain, resulting in a stronger asymmetry. Large deformation also enhances the asymmetry as a consequence of stronger fibril stiffening.
The Asymmetry of Transient Response in Compression Versus Release for Cartilage in Unconfined Compression
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division August 29, 2000; revised manuscript received April 17, 2001. Associate Editor: L. A. Taber.
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Li , L. P., Buschmann, M. D., and Shirazi-Adl, A. (April 17, 2001). "The Asymmetry of Transient Response in Compression Versus Release for Cartilage in Unconfined Compression ." ASME. J Biomech Eng. October 2001; 123(5): 519–522. https://doi.org/10.1115/1.1388295
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