For the circumferential cracked pipe under combined primary and secondary stress, an interaction between the primary and secondary stress is occurred and secondary stress is redistributed by primary stress. It is also contribute J-integral for elastic...
For the circumferential cracked pipe under combined primary and secondary stress, an interaction between the primary and secondary stress is occurred and secondary stress is redistributed by primary stress. It is also contribute J-integral for elastic plastic fracture mechanics. To account for this phenomenon, R6 code and RCC-MR A16 code provide J-integral estimation methods under combined primary and secondary stress. In this paper, J-integral estimation methods considering combined stress redistribution effect in R6 and RCC-MR A16 code are compared with finite element analysis result using ABAQUS. In this comparison, primary and secondary load order effect, magnitudes of the thermal stress, crack geometry effect, plastic strain hardening effect is considered. . R6 code estimate result is conservative near the Lr=1 and RCC-MR A16 code estimate result is conservative near the Lr=0. As a result, this paper proposes modified method of J-integral estimation in R6, RCC_MR A16 code.