Ductile Fracture Behavior of Cylindrical Vessels Containing a Large Surface Flaw

Abstract

A consideration was performed concerning to the ductile fracture dehavior of the pressure vessel with a large surface flaw. The pressure at the ductile fracture initiation has a distinct relation with the depth and the length of a surface flaw. Expressions for this relation were investigated by many researchers, but in the case of relatively a short surface flaw, the estimation seems to have not a coincidence with experiments. In this report, the rectification of the Kiefner's equation for the estimation of ductile fracture initiation from a large surface flaw was made by reflecting the restraint of flaw ends to the ligament of thickness. Re-estimation using the corrected equation had a relatively good coincidence with kiefner's burst data and author's data in the case of relatively a short surface flaw.