構造用高分子材料PPEの非弾性挙動と数値解析(G03-7 高分子材料,G03 材料力学)

概要

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Monotonic compressive loading, relaxation and cyclic straining tests were conducted under constant and time-varying strain rate conditions of 1.1×10^<-2>〜10^<-5> and 10〜40℃ for polyphenylen-ether (PPE), an amorphous polymer. The observed stress-strain responses were similar to those of other engineering plastics showing remarkable effects of the strain rates and temperature, but the strain-rate change tests revealed predominant overshoot phenomena in the stress transfer processes. The experimental results indicated that the concept of time-temperature equivalence is also applicable to PPE and the comparative investigation was carried out for five polymeric materials. The viscoplastic constitutive model based on overstress successfully reproduced the observed stress-strain responses including the overshoot phenomena using a newly proposed additional function which control the viscosity in the model. Finally, in the cyclic straining tests a unsymmetrical peculiar stress-strain curve appeared showing notable differences in tensile and compressive process.
一般社団法人日本機械学会の論文
2004-09-04