抄録
The prediction method for analyzing the crack opening area of a pipe is essential for leak-before-break evaluation. Several theoretical approaches are proposed for predicting crack opening areas. One approach is the Tada and Paris formula, developed based on the linear elastic fracture mechanics. Another is the engineering approach developed by German and Kumar. Round-robin analyses for crack opening areas are performed using these two methods. The pipe analyzed is a 6-inch-diameter Type 304 stainless steel pipe with a circumferential through-wall crack. The applied load is bending moment. The crack opening areas calculated by Tada and Paris method coincided among the four participants. However, the areas using German and Kumar method were quite different. It is concluded that in the present situation, Tada and Paris method is suitable for a leak-before-break standard to predict the crack opening area. In addition, material properties used in the calculation of the standard are discussed compared with the results of the pipe bending experiment.
