脆性材料の除荷時の破壊条件

概要

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Fracture condition of brittle materials under unloading process was analytically discussed by using the fundamental equations and the constitutive equation between a and K_I (a ; the crack velocity, K_1 ; the stress intensity) used by Fuller et al, who formulated the truncated strength as the function of unloading rate in proof test. Whether or not the fracture criterion K_1=K_<IC> used in their analysis and their analytical results is physically acceptable has been rechecked out from a standpoint of survival condition without using any fracture criterion. By the present analysis, it has been cleared not only that the fracture criterion K_t=K_<IC> used by them has been not sufficient to represent fracture and survival condition in proof test but that the truncated strength in proof test of brittle materials does not exist as far as the materials are rate sensitive.
一般社団法人日本機械学会の論文
1998-07-25