高密度ポリエチレンの粘塑性変形 : ひずみ速度と温度の影響について

概要

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Monotonic compressive loading tests and relaxation tests are conducted on high-density polyethylene (HD-PE) at the strain rates of 1.1×10^<-1> to 1.1×10^<-5>s^<-1> and temperatures of 10, 25 and 40℃. The observed stress-strain responses are similar to those for steels at elevated temperature. The material constants of the viscoplasticity model based on overstress is determined for HD-PE at every temperature and the model is shown to successfully simulate such rate-dependent phenomena numerically. The examination of the stress-strain curves suggests that the strain-rate and temperature effects on the deformation curves can be expressed using a unified parameter. The viscoplastic behavior observed in the strain-rate cycling test at 25℃ is reproduced in the similar test at 40℃ designed for this parameter, and the phenomenon is verified in the numerical experiment by the overstress model.
一般社団法人日本機械学会の論文
1995-04-25