RATIONALE METHODOLOGIES CALCULATING J-INTEGRAL FOR THROUGHWALL CRACKED PIPES LOAD BY COMBINATION FORCE, BENDING MOMENT AND PRESSURE. PART:II
DOI:
https://doi.org/10.20535/2305-9001.2012.65.33909Keywords:
through-wall cracked pipe, leak before break, limit load, reference stress, J-integral.Abstract
Abstract. We consider boundary conditions of through-wall cracked pipe of different crack sizes and ratios of mean radius to thickness of wall under the action of combined loading pressure force and the cross point, which corresponds to the practical needs of enterprises of the energy profile. The author reveals the evolution of methods for calculation of elastic-plastic fracture with a crack pipe before demolition. Classification of methods of determining the limit of pipes with cracks. Given a reasonable analysis of existing methods of determination of J-integral and reference stress highlighted some significant advantages over other methods. In numerical solutions of problems of fracture mechanics for the pipes with continuous circular crack in the limit load applied software package Abaqus v.6.10 license Freiburg’s University IWM. The data which calculated of J-integral for the two types of pipes with cross cracks in the 12 different methods used in leading countries. The data obtained for the limit of pipe with one the factor loading bending moment, as well as the simultaneous action of internal pressure and bending moment.References
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