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TECHNICAL PAPERS: Soft Tissue

Experimental Verification of the Roles of Intrinsic Matrix Viscoelasticity and Tension-Compression Nonlinearity in the Biphasic Response of Cartilage

[+] Author and Article Information
Chun-Yuh Huang, Michael A. Soltz, Monika Kopacz, Van C. Mow, Gerard A. Ateshian

Departments of Mechanical Engineering and Biomedical Engineering, Columbia University, 500 West 120th St., New York, NY 10027

J Biomech Eng 125(1), 84-93 (Feb 14, 2003) (10 pages) doi:10.1115/1.1531656 History: Received June 01, 2001; Revised June 01, 2002; Online February 14, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic of the testing protocol of the UCF and UCD tests
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Typical experimental responses and theoretical curve-fits of the biphasic-CLE-QLV model for unconfined compression stress-relaxation with (a) slow (UCS), and (b) fast (UCF) strain rates
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Conversion of the UCF experimental data from the time domain to the frequency domain, using the procedure outlined in Appendix B. The corresponding UCD experimental data is also presented for the same typical specimen: (a) amplitude and (b) phase angle of the dynamic modulus.
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Typical experimental responses and theoretical curve-fits of the BPVE model for unconfined compression stress-relaxation with (a) slow (UCS), and (b) fast (UCF) strain rates
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Typical confined compression stress-relaxation (CCS) experimental response and theoretical curve-fit using the biphasic-CLE-QLV model
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Average results of (a) amplitude and (b) phase angle of the dynamic modulus as measured from the UCD test, together with the theoretical prediction from the biphasic-CLE-QLV model using the mean values of the material properties curve-fitted from the CCS, UCS and UCF tests (6 specimens)
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(a) A representative experimental response in uniaxial tension from a single sample of bovine cartilage. (b) Theoretical responses of biphasic-CLE-QLV and BPVE models in uniaxial tension using the average properties listed in Table 1.
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(a) A representative experimental response of interstitial fluid pressure reported in our earlier study 2 for unconfined compression stress-relaxation test on cylindrical bovine articular cartilage plugs (diam. 4.78 mm). Pressure was measured at the center of the articular surface, over a circular footprint 1 mm in diameter. (b) Theoretical predictions of interstitial fluid pressure response responses in unconfined compression stress-relaxation test from the biphasic-CLE-QLV and BPVE models using the average properties listed in Table 1. The BPVE model is unable to predict the elevated fluid pressures observed experimentally.

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