902 延性ポリマの損傷進展・消滅モデルにおける平均塑性垂直ひずみの同定

概要

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The damage caused by the existence of a craze is characterized by its annihilation in the oriented molecular region. In the previous report, the elastoviscoplastic constitutive equation, which explicitly represents the effect of crazes, is derived. Through the thermodynamic discussion about arguments of craze rate function in an evolution equation, a new craze evolution equation is proposed so as to express craze propagation and annihilation, at the same time, the condition of craze generation is also proposed using a hydrostatic stress criterion. In this report, an evolution law of mean plastic strain is derived using numerical experiments for polymer blocks with some circular holes in a tensile field. The craze annihilation in the oriented molecular region and the propagation of concentrated craze region are visualized using a finite element simulation, and the possibility of the failure prediction using the obtained viscoplastic vertex model and craze evolution model is also discussed.
社団法人日本機械学会の論文
2003-08-05