Life Prediction and Crack Propagation Analysis for The Pipe Weld Straight Component (PWSC) of Power Plant

In the present paper the fatigue crack growth behavior of surface cracked piping component are performed on the basis of the linear elastic fracture mechanics (LEFM) principles with particular interest in its ability and accuracy to predict full scale component tested experimental data. The crack prorogation is consider in semi elliptical shape. In the present paper three different diameter Pipe weld straight components (PWSC 12-6, PWSC 16-4, PWSC 16-5) are selected. The two SIF solution (ASM and Bergman) available in the literature, the extreme point SIFs (depth and surface) are determined at initial crack depth of 3.6 mm the case PWSC12-6. The yield strength for the material is 325MPa. In this case, the applied nominal 183MPa stress range, which is 0.56 times the strength of the material. Therefore, for the particular case the plastic zone correction is applied. The two extreme points SIFs are determined at physical crack depth and also at effective crack length. The details of crack depths at which these SIFs are determined are given in Table 1 and Table 2 Corresponding crack lengths determined are also given in these tables. The analysis are also done for remain two pipe , having the different yield strength of the materials. The details of crack depths at which these SIFs are determined are given in Table 3&4 and Table 5&6 Corresponding crack lengths determined are also given in these tables.