Stress intensity factor of an arbitrarily located circumferential crack in axisymmetrically loaded cylinders

摘要

A simplified method to approximately calculate the stress intensity factor of a circumferential crack in a cylinder subjected to axisymmetric radial and bending loads at the cylinder edges was developed, based on the theory of cylindrical shell and compliance. The method will be useful in cases such as evaluating the stress intensity factor of a circumferential crack in a cylindrical pressure vessel with hemispherical ends, where axisymmetric radial and bending loads are caused to eliminate the structural discontinuity at the joints. The effects that the cylinder length and the crack location have on the stress intensity factor can be evaluated systematically by using the method. The validity of the method was illustrated by comparing solutions with numerical ones under axisymmetric bending and radial loads. The results showed the significant effect of cylinder length and crack location on the stress intensity factor.