高密度ポリエチレンの曲げクリープ解析と実験的検討

概要

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The previous monotonic compressive loading tests for high-density polymers including polyethylene, revealed that the inelastic deformation behavior of these engineering plastics is remarkably rate dependent at room temperature. The viscoplastic constitutive theory based on overstress had reproduced such deformation of the polymers successfully. In this study the overstress model is applied to analyze the creep behavior of polyethylene beams at 25℃ subjected to a linearly increasing moment which is subsequently held constant. The numerical experiments show the significant loading rate effects, illustrating that the stress distribution at the moment increase depends on the moment rate. Such rate effects disappear with time when stresses are redistributed and reach equilibrium stress curve. In order to verify the numerical results, four-point bending tests are performed for polyethylene beams and the time-histories of curvatures obtained experimentally from surface-strain measurements show a fairly good correspondence with the numerical results.
一般社団法人日本機械学会の論文
1999-09-25