K-0843 エポキシ樹脂の破壊靭性値の温度・時間依存性に及ぼす硬化状態の影響(G03-14 高分子材料)(G03 材料力学部門一般講演)

概要

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In the present study, we discuss the curing state effect of the epoxy resin (DGEBA) on the temperature-time dependence of the fracture toughness. The glass transition temperature and the fragility parameter are applied in order to represent the curing state of the epoxy resins post-cured under various conditions. It is confirmed, first, that the time-temperature equivalent principle is applicable to the fracture toughness. Then we compare the master curves of the specimens which have the same glass transition temperature and the different fragility. When temperature increases, their master curves of the fracture toughness near the glass transition temperature. The fracture toughness of the specimen with lower fragility increases from lower temperature, but the brittle-ductile temperature is approximately the same regardless the fragility. The result shows these two parameters can be very useful to estimate the time-temperature dependence of fracture toughness of the epoxy resin.
社団法人日本機械学会の論文
2001-08-22