This concentration of stress further accelerates cartilage wear with thinning of outer layers and propagation of cracks and fissures in the deeper layers 集中的应有尽有力进一步加速外民支软骨磨损及变薄，也加速深层碎裂和裂隙的扩布。
2.
Establishing finite element method pattern analyzed stress and deforming of main parts of impeller and improved the structure of impeller from reducing the concentration of stresses and the abundance of intension 摘要通过建立有限元分析模型，对叶轮的主要零部件进行应力、变形分析，据其结果考虑减少应力集中和强度裕量，改进叶轮结构。
