This study investigated the abilities of the linear biphasic poroviscoelastic (BPVE) model and the linear biphasic poroelastic (BPE) model to simulate the effect of variable ramp strain rates on the unconfined compression stress relaxation response of articular cartilage. Curve fitting of experimental data showed that the BPVE model was able to successfully account for the ramp strain rate-dependent viscoelastic behavior of articular cartilage under unconfined compression, while the BPE model was able to account for the complete viscoelastic response at a slow strain rate, but only the long-term viscoelastic response at faster strain rates. We concluded that the short-term viscoelastic behavior of articular cartilage, when subjected to a fast ramp strain rate, is primarily governed by a fluid flow-independent (intrinsic) viscoelastic mechanism, whereas the long-term viscoelastic behavior is governed by a fluid flow-dependent (biphasic) viscoelastic mechanism. Furthermore, a linear viscoelastic representation of the solid stress was found to be a valid model assumption for the simulation of ramp strain rate-dependent relaxation behaviors of articular cartilage within the range of ramp strain rates investigated.
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April 2001
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Biphasic Poroviscoelastic Simulation of the Unconfined Compression of Articular Cartilage: II—Effect of Variable Strain Rates
Mark R. DiSilvestro,,
Mark R. DiSilvestro,
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
11
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Qiliang Zhu,,
Qiliang Zhu,
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
11and
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Jun-Kyo Francis Suh
Jun-Kyo Francis Suh
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
22
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Mark R. DiSilvestro,
11
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
Qiliang Zhu,
11and
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
Jun-Kyo Francis Suh
22
Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division Dec. 1999; revised manuscript received Oct. 2000. Associate Editor: J. D. Humphrey.
J Biomech Eng. Apr 2001, 123(2): 198-200 (3 pages)
Published Online: October 1, 2000
Article history
Received:
December 1, 1999
Revised:
October 1, 2000
Citation
DiSilvestro,, M. R., Zhu,, Q., and Suh, J. F. (October 1, 2000). "Biphasic Poroviscoelastic Simulation of the Unconfined Compression of Articular Cartilage: II—Effect of Variable Strain Rates ." ASME. J Biomech Eng. April 2001; 123(2): 198–200. https://doi.org/10.1115/1.1351887
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