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Nonlinear viscoelastic properties of articular cartilage in shear
Author(s) -
Spirt Adrienne A.,
Mak Arthur F.,
Wassell Richard P.
Publication year - 1989
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.1100070107
Subject(s) - viscoelasticity , stress relaxation , materials science , nonlinear system , shear stress , relaxation (psychology) , shear modulus , shear (geology) , strain (injury) , stress (linguistics) , articular cartilage , mechanics , composite material , physics , anatomy , creep , osteoarthritis , medicine , linguistics , alternative medicine , pathology , philosophy , quantum mechanics , psychology , social psychology
The strain dependence of the intrinsic viscoelastic properties of the cartilage matrix in shear was investigated. Stress relaxation experiments were performed on bovine articular cartilage at shear strains ranging from approximately 3% to 16%. The tissue was found to exhibit nonlinear strain‐dependent viscoelastic behavior, with the nonlinearity occurring primarily in the short‐time transient during stress relaxation. In addition, the equilibrium stress was found to fit a quadratic relation with strain. This relationship was noted to be nearly linear with strain from 3% to 16%. The instantaneous stress was seen to be highly nonlinear, and followed a cubic relationship with applied shear strain. Fung's quasilinear theory can be used to describe the stress relaxation response over the range of strains examined when a nonlinear regression is performed to determine an “average” normalized relaxation function. Alternately, strain dependence can be incorporated into the model to describe and predict more accurately the strain‐dependent stress relaxation response.