关节软骨力学行为的数值模拟

Numerical Simulation of Mechanical Behaviors of Articular Cartilages

关节软骨为一由骨胶原和蛋白聚糖固体相和孔隙流体相组成的多孔材料 ,其可以用基于混合物理论的两相多孔介质模型准确描述。作者采用有限元数值方法分析关节软骨围限压缩蠕变和应力松弛问题 ,得到软骨组织在蠕变和应力松弛过程中 ,固体相和流体相的速度、固体相的有效应力以及孔隙压力等随时间的变化规律。所得到的结果可以为人工软骨材料和人工关节的研制提供理论参考 。

Articular cartilage, which is composed with a solid phase of collagen fibers and proteoglycan and a pore fluid phase, can be depicted with two-phase porous medium model based on mixture theory. This paper analyzed the creep and stress relaxation responses of confined compression problems of articular cartilage with the developed finite element method. The obtained responses of velocities of both solid and fluid phases and the effective stresses of solid phase as well as the pore pressures during the creep and stress relaxation processes of articular cartilage tissues under confined compression can be used as a theoretical reference for man-made cartilage materials, and behave important significance for the research in bio-mechanical engineering area.