J-R curves of an axial crack in a STS410 pipe and simplified failure evaluation method

Abstract

It is very important to develop a simplified flaw evaluation method that can be applied to carbon steel pipes with an axial flaw under the elastic-plastic fracture mode, since the JSME fitness for services code does not contain such a technique. So, this paper makes clear the ductile fracture resistance, J-R curves of an axial crack in STS410 carbon steel pipes commonly used in the primary loops of boiling water reactor plants, and derives the Z-factor for axial flaw evaluation based on the failure assessment diagram approach.