高分子材料の応力・ひずみ挙動における時間-温度換算特性

概要

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Monotonic compressive loading and relaxation tests are conducted at the strain rates of 1.1×10^<-1>〜1.1×10^<-5>S^<-1> and the temperature of 10,25 and 40℃ for the column specimens of polypropylene and polycarbonate following the previous study for high-density polyethylene. The observed stress-strain responses for the three engineering plastics are simulated successfully using the constitutive model based on overstress. The examination of such stress-strain behavior reveals that the effects of the strain-rates and the temperatures on the rate-dependent deformations are expressed using a unified parameter and that the viscoplastic behavior at one temperature can be related to that at another temperature by a change in the time scale only. This results indicate that the concept of timetemperature equivalence is applicable to these solid polymers within the range of test conditions, and the reconstructed viscoplastic constitutive model with use of the equivalent time has produced the deformation behavior under time-varying temperature conditions demonstratively.
一般社団法人日本機械学会の論文
1998-08-25