超高分子量ポリエチレンの機械的性質と構成式

概要

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UHMW-PE has been used as a bearing material in the artificial knee joint. Stress analysis, using FEM, is generally performed to clarify the cause of in vivo wear and delamination. A test machine, of the displacement control type, was designed and built and equipped with a measuring system to obtain accurate test results and the constitutive equation of UHMW-PE. The maximum crosshead speed of the machine is 10^4 mm/min. Furthermore, it has the capability of determining stress relaxation and strain recovery behavior immediately after performing a tensile test. Interesting properties of UHMW-PE have been obtained using this machine. Also, the constitutive equations for plasticity and viscoelasticity were derived from the experimental results. The equations have strongly nonlinear properties in the mechanical model described in this work. Stress relaxation simulations based on the equation for viscoelasticity have been performed. From this, it was confirmed that the equation is valid.
社団法人日本機械学会の論文
1999-01-25