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Report No.
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Development of J-integral solutions for semi-elliptical circumferential cracked pipes subjected to internal pressure and bending moment

Udagawa, Makoto; Katsuyama, Jinya  ; Yamaguchi, Yoshihito ; Li, Y. ; Onizawa, Kunio 

The J-integral solution for cracked pipes is a high important parameter in crack growth calculation and failure evaluation based on the elastic-plastic fracture mechanics. One of the most important crack types in structural integrity assessment for nuclear piping systems is circumferential semi-elliptical surface crack. Although several J-integral solutions have been provided, no solution was developed at both the deepest and the surface points of circumferential semi-elliptical surface cracks. In this study, the J-integral solutions of circumferential semi-elliptical surface cracks were developed by numerical finite element analyses. Moreover, in order to benefit users in practical applications, a pair of convenient J-integral estimation equations were developed. The accuracy and applicability of the convenient equations were confirmed by comparing with the provided stress intensity factor solutions in elastic region and with finite element analysis results in elastic-plastic region.

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