刚度
弹性模量
复合材料
接触力学
聚乙烯
变形(气象学)
材料科学
高密度聚乙烯
聚四氟乙烯
压力(语言学)
杨氏模量
摩擦学
接触面积
模数
医学
有限元法
结构工程
哲学
工程类
语言学
作者
Avram A. Edidin,Steven M. Kurtz
标识
DOI:10.1016/s0883-5403(00)90647-8
摘要
The elastic and large-deformation mechanical behavior of 4 materials with known clinical performance was examined and correlated with the wear behavior in a hip simulator. Acetabular liners of a commercially available design were machined from ultra-high molecular weight polyethylene (UHMWPE), high-density polyethylene (HDPE), polytetrafluoroethylene (PTFE), and polyacetal and wear tested in a multidirectional hip joint simulator. Elastic and large-deformation mechanical behavior was directly measured from the wear-tested liners using the small punch test. The finite element method was used to compute elastic modulus from the measured small punch test initial stiffness, and the contact stress for the liners was calculated using the theory of elasticity solution. Positive, statistically significant correlations were observed between the hip simulator wear rate and the initial peak load, ultimate load, and work to failure from the small punch test. Negative correlations were observed between the wear rate and the elastic modulus and contact stress. The results of this study support the hypothesis that the large-deformation mechanical behavior of a polymer plays a greater role in the wear mechanisms prevalent in total hip replacements than the elastic behavior.
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