最大応力拡大係数(K値)増による下限界K値範囲漸減率の定量予測

In this paper, we propose a method to quantitatively estimate the decrease in threshold stress intensity factor (SIF) range due to high SIF, that is observed for some materials in constant maximum SIF fatigue crack growth tests. The parameters cased for the simulation were inversely determined with the aid of Genetic Algorithm. The validity of our method was shown by comparing the simulation data with experimental data for embrittled S 55 C.