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The Nonlinear Viscoelasticity of the Human Knee Articular Cartilage

机译：人膝关节关节软骨的非线性粘弹性

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The human knee cartilage play an important role in the knee joint. Osteoarthritis (OA) are related to knee joint cartilage. So the accurate description of the cartilage constitutive is the most important work for the understanding the cartilage test phenomenon. The role of viscoelasticity of collagen fibers in bovine articular cartilage was examined in compression and tension using stress relaxation measurements in the axial direction (normal to the articular surface. The human knee joint cartilage also shows the same viscoelastic property in compression and tension test using stress relaxation measurement in the direction (normal to the articular surface). The tension and compression test show the non-linear viscoelastic property. A viscoelastic fibril-reinforced model including fluid flow was used for analysis of the experimental data. The collagen fibrillar matrix was assumed to be viscoelastic with a strain-dependent tensile modulus, and the nonfibrillar matrix was modeled as linearly elastic. For axial tension, collagen viscoelasticity was found to account for most of the stress relaxation, while the effects of fluid pressurization on the tensile stress were negligible. So we use the viscoelastic constitutive to define the cartilage for simulating the tension and compression test. This study illustrates the essential and mainly role of collagen viscoelasticity.
机译：人体膝关节软骨在膝关节中发挥着重要作用。骨关节炎（OA）与膝关节软骨有关。因此，软骨本构的准确描述是了解软骨测试现象的最重要工作。使用应力松弛测量在轴向上的压缩和张力中检查胶原纤维在牛关节软骨中的作用（垂直于关节表面。人膝关节软骨也使用应力在压缩和张力试验中显示相同的粘弹性。在方向上放松测量（垂直于关节表面）。张力和压缩试验显示了非线性粘弹性的性质。包括流体流动的粘弹性纤维增强模型用于分析实验数据。假设胶原纤维状基质用应变依赖性拉伸模量的粘弹性，非纤维粒子基质被建模为线性弹性。对于轴向张力，发现胶原粘片粘弹性考虑了大部分应力松弛，而流体加压对拉伸应力的影响可忽略不计。所以我们使用粘弹性组成型来定义软骨模拟张力和压缩测试。本研究说明了胶原粘膜粘弹性的必然性和主要作用。

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