4001 生分解性高分子nPLAの非弾性挙動への温度、ひずみ速度、負荷履歴の効果と数値解析(S25-1 非弾性変形,S25 材料・構造の非弾性挙動・高温強度・損傷評価)

概要

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The development of reliable constitutive equations for solid polymers has become of interest recently due to the growing use of polymeric materials in structure, and especially, biodegrability polymers such as polylactic acid, PLA are noticeable from the environmental-friendly view point. In this study, monotonic compressive deformation tests were conducted under time-varying strain rate and temperature conditions of 1.1×10^<-2>〜10^<-5>s^<-1> and 10〜60℃ for nanocomposite-processed PLA (nPLA). Experimental stress-strain responses were compared with those of typical engineering polymers: PE, PP and PD, and some important deformation characteristics are revealed regarding stiffness, work-hardening and softening, overshoot phenomena in stress jumping conditions, stress-strain responses at elevated temperature, and inapplicability of time-temperature equivalence. The viscoplastic constitutive model based on overstress, VBO has reproduced basic experimental results successfully.
一般社団法人日本機械学会の論文
2006-09-15