The ductile crack growth calculation method under excessive cyclic loading has not been established in the rules for fitness for service, even for Mode I. On the paper for the PVP2017 conference, the authors simulated ductile crack growth behavior of CT specimens under cyclic loading within a committee of the Japan Welding Society, and showed that the Chaboche model and bilinear kinetic hardening rules underestimated the load in compression. The discrepancy between the prediction results and the experimental results were also shown to become larger with increasing load cycle number. In this paper, the authors tried to establish how to determine the parameters of the combined hardening rule and then applied it to simulate the ductile crack growth behavior of the 1TCT specimens for loading levels different from that of last year. Also, the simplified ΔJ calculation, for example the reference stress method, and the crack growth rate from the JSME rules for FFS were applied to estimate the ductile crack growth. Based on this approach, the crack growth analysis method was investigated in order to incorporate into the JSME rules for large cyclic loading.

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