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TECHNICAL PAPERS

A Conewise Linear Elasticity Mixture Model for the Analysis of Tension-Compression Nonlinearity in Articular Cartilage

[+] Author and Article Information
Michael A. Soltz, Gerard A. Ateshian

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J Biomech Eng 122(6), 576-586 (Jul 10, 2000) (11 pages) doi:10.1115/1.1324669 History: Received November 30, 1999; Revised July 10, 2000
Copyright © 2000 by ASME
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References

Figures

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For the octantwise orthotropic CLE model of the solid phase of cartilage, the three preferred directions of material symmetry are taken to be: a1 parallel to the cartilage split line direction, a2 perpendicular to the split line direction, and a3 normal to the articular cartilage surface
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(a) Apparatus for performing confined and unconfined compression tests. A different testing chamber was employed for (b) confined, and (c) unconfined compression.
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Apparatus for performing torsional shear tests
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Experimental confined compression stress-relaxation response [Fc(t)/πr 02] and corresponding theoretical curve-fit for a typical specimen
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Experimental unconfined compression stress-relaxation response [Fu(t)/πr 02] and corresponding theoretical curve-fit for the same specimen as in Fig. 4. The experimental interstitial pressure at the specimen center [p(r=0,t)] and corresponding theoretical prediction are also presented.
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Interstitial fluid load, Pu(t), total load Fu(t), and ratio of fluid to total load support, Pu/Fu, as a function of time for unconfined compression stress-relaxation, using the average material properties listed in Table 1

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