The Apparent Viscoelastic Behavior of Articular Cartilage—The Contributions From the Intrinsic Matrix Viscoelasticity and Interstitial Fluid Flows

[+] Author and Article Information
A. F. Mak

Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pa. 19104

J Biomech Eng 108(2), 123-130 (May 01, 1986) (8 pages) doi:10.1115/1.3138591 History: Received March 11, 1985; Revised November 13, 1985; Online June 12, 2009


Articular cartilage was modeled rheologically as a biphasic poroviscoelastic material. A specific integral-type linear viscoelastic model was used to describe the constitutive relation of the collagen-proteoglycan matrix in shear. For bulk deformation, the matrix was assumed either to be linearly elastic, or viscoelastic with an identical reduced relaxation spectrum as in shear. The interstitial fluid was considered to be incompressible and inviscid. The creep and the rate-controlled stressrelaxation experiments on articular cartilage under confined compression were analyzed using this model. Using the material data available in the literature, it was concluded that both the interstitial fluid flow and the intrinsic matrix viscoelasticity contribute significantly to the apparent viscoelastic behavior of this tissue under confined compression.

Copyright © 1986 by ASME
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