J 積分による遷移温度域 K_<IC> の評価に関する数値実験

概要

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A Numerical experiment to examine the fitness of four methods of evaluating the K_<IC> based on the J-integral has been made. The methods examined were Irwin's method, the minimum value method, the two parameter Weibull distribution function method, and the three parameter Weibull distribution function method. The fracture toughness data consisted of about 20 K_<IC> data and about 150 J_c data obtained under the four test conditions. The main results obtained are as follows: (1) The scatter of evaluated K_<IC> by means of Irwin's method showed a smaller value than that of the other methods; (2) Suitable K_<IC> values are obtained by means of the minimum value and also Irwin's methods; (3) For the case of the minimum value method, the minimum required specimen number condition to obtain the appropriate K_<IC> is given by the following equation: Σβ≧2.5: (4) The two parameter Weibull distribution function method is appropriate to correlate the fracture toughness from a smaller specimen with that from a larger specimen, but it has some problems yet to be solved as a elastic-plastic fracture methodology to evaluate K_<IC>.
一般社団法人日本機械学会の論文
1986-02-25