人工膝関節用超高分子量ポリエチレンの微小領域における変形挙動(S04-4 医療とバイオエンジニアリング,工学技術の医療応用(4),S04 医療とバイオエンジニアリング,工学技術の医療応用)

概要

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So-called "delamination destruction" is often observed on ultra-high molecular polyethylene (UHMWPE) knee components. We reported that the grain boundary becomes the place at which destruction takes place and presence of D,L-α-Tocopherol (vitamin E:VE) at the grain boundary prevents crack propagation. It was also reported that partial hardening (or degradation) might be prevented by the anti-oxidization effect of VE. The purpose of this study is to clarify the mechanism in which VE suppresses the influence of gamma-ray irradiation, and the mechanism of delamination destruction using the image correlation method with tensile-testing. The results showed that the increase-rate of volume strain in the grain boundary was lower than at in grain for the gamma-irradiated UHMWPE. In contrast, the virgin sample and the VE added sample show contrary results.
社団法人日本機械学会の論文
2004-09-04