NONLINEAR VISCOELASTIC PROPERTIES OF ARTICULAR-CARTILAGE IN SHEAR
NONLINEAR VISCOELASTIC PROPERTIES OF ARTICULAR-CARTILAGE IN SHEAR
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DOI：
10.1002/jor.1100070107
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发表时间：
1989-01-01
影响因子：
2.8
通讯作者：
WASSELL, RP
中科院分区：
文献类型：
--
作者：
SPIRT, AA;MAK, AF;WASSELL, RP
软骨基质的固有粘弹性在剪切应变依赖性进行了研究。应力松弛实验进行牛关节软骨的剪切应变范围从约3%至16%。组织被发现表现出非线性应变依赖的粘弹性行为，与非线性主要发生在应力松弛过程中的短时间瞬态。此外，平衡应力与应变符合二次曲线关系。注意到这种关系在3%至16%的应变下几乎是线性的。瞬时应力被认为是高度非线性的，并遵循与所施加的剪切应变的三次关系。当进行非线性回归以确定“平均”归一化松弛函数时，Fung的准线性理论可用于描述在所检查的应变范围内的应力松弛响应。或者，应变依赖性可以被纳入模型中，以更准确地描述和预测应变依赖性应力松弛响应。
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.