Crack extension analysis of center cracked plate subjected to tension and through-wall cracked pipe subjected to bending

Abstract

For the crack extension analyses of LBB evaluation, several approaches using the J- integral are available. Although the node release technique is a direct and physical method to compute the J- value along with the crack growth, this method requires a complex procedure for node releasing. In this study, using an alternative approach which has known as a methodology and is tentatively called the stationary crack technique the load-load point displacement curves without tearing were developed for a number of models of the same pipe section with slightly different crack lengths. Making a comparison between the J value by the node release technique and the stationary crack technique, a center cracked plate under tensile load and a circumferential through-wall cracked pipe under 4-point bending load were analyzed, and compared with other researcher's results. Consequently, J values, load-load point displacement curves, etc. by both methods have good agreements and the stationary crack technique is effective for the crack extension analysis of LBB evaluation.