ポリウレタン系形状記憶ポリマーフィルムのエネルギー散逸および貯蔵の繰返し特性

概要

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By examining the stress strain relationship in a film made of shape-memory polymer of polyurethane series through cyclic loading at and above the glass transition temperature T_u, the properties of energy dissipation and storage were investigated. The results are summarized as follows. (1) Although yield stress decreases and irrecoverable strain appears after the initial loading at and above T_g, stress-strain curves vary slightly thereafter. Therefore, in order to obtain constant cyclic deformation properties in practical applications, mechanical training with one cycle is effective. (2) The rate of energy dissipation is 0.6〜0.7 in the case of loading at T_g. Therefore, its capacity as a damping material is excellent at T_g. The higher the strain rate and the maximum strain, the larger the dissipated work. (3) The energy storage efficiency is 0.7〜0.8 in the case of loading above T_g. Therefore, the performance as a energy storage material is high above T_g. The amount of recoverable strain energy is almost the same at and above T_g. (4) The performance as a damping and energy storage material is effective if the polymer element is of a large scale and is subjected to large deformation.
社団法人日本機械学会の論文
1997-09-25