Abstract
Structural integrity considering the fatigue have become to be important, as energy-related structures such as nuclear piping systems especially have been usually operating under cyclic loads. This study is concerned about the leak-before-break (LBB) behavior when pipe including a circumferential crack is subjected to a cyclic load. Attentions were paid to the proposal of assessment models and conditions on the LBB behavior considering a crack shape at wall penetration under a cyclic load, the comparison of LBB condition between a static load and a cyclic load, and the characteristic of the fatigue LBB behavior under statically indeterminate system. It is concluded that LBB behavior is more likely to be occurred in statically indeterminate piping system, as the reduction of ultimate strength due to a sufficient redistribution of bending moment in this system was relatively small. This benefit on structural integrity of statically indeterminate system was applied to the fatigue LBB behavior envisioned the validity and the superiority of the fatigue LBB behavior in statically indeterminate piping system.
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