Mak A F
J Biomech Eng. 1986 May;108(2):123-30. doi: 10.1115/1.3138591.
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 stress-relaxation 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.
关节软骨在流变学上被建模为双相多孔粘弹性材料。使用一种特定的积分型线性粘弹性模型来描述胶原 - 蛋白聚糖基质在剪切中的本构关系。对于体积变形，假定基质要么是线弹性的，要么是具有与剪切中相同的约化松弛谱的粘弹性。间质液被认为是不可压缩且无粘性的。使用该模型分析了在受限压缩下关节软骨的蠕变和速率控制应力松弛实验。利用文献中可得的材料数据得出结论，在受限压缩下，间质液流动和基质固有粘弹性均对该组织的表观粘弹性行为有显著贡献。
