Closed-form stress intensity factor solutions for circumferential and axial surface cracks with large aspect ratios in pipes

配管に存在する周方向及び軸方向高アスペクト比亀裂の応力拡大係数の閉形式解

東 喜三郎*; Li, Y. 

Azuma, Kisaburo*; Li, Y.

In this paper, we investigate the influence of the stress intensity factor at the maximum point for a circumferential crack and an axial crack with a large aspect ratio in a cylinder. First, we obtained the influence coefficients Gi for the stress intensity factor at the surface point, the deepest point, and the maximum point by finite element analysis, and developed a series of closed-form Gi solutions. Then, we proposed methods for evaluating the stress intensity factor for a crack with a large aspect ratio in a manner that characterizes the influence of the solutions at the maximum point.