Stress Intensity Factor and Limit Load Solutions for New Pipe-ring Specimen with Axial Cracks

Abstract

Pipelines are often designed as thin walled structure, where the standard specimen for fracture toughness testing is difficult to cut. Most critical crack orientation is in axial direction, because the hoop stress is two times higher than radial one. New pipe-ring specimen as ring was proposed for fracture toughness testing. The pipe-ring specimen with through thickness crack was subjected to bending loading. In this case the bending and share stresses occurred in critical pipe-ring sections. In order to ensure transferability between standard and proposed pipe-ring specimen the compendia for stress intensity factor and limit loads for pipe-ring specimens with different crack aspect ratio has been proposed. The results of stress intensity factor and limits load are obtained by using finite element modelling. Specimen's configurations have been modeling with ABAQUS software in order to find SIF and limit load in terms of loading and geometrical conditions