内圧を受ける有限肉厚円筒の内面に存在する半だ円表面き裂の応力拡大係数 : 第2報、計算結果

抄録

Analysis of an internal semi-elliptical surface crack in cylindrical pressure vessels is practically important in order to evaluate brittle fracture or fatigue strength of pressure vessels. Therefore some researchers have tried to obtain the stress intensity factors for this problem. However there is some difference between these data. In this paper, the accurate values of stress intensity factor for this problem are calculated by the body force method in order to check the accuracies of those data. The differences between the stress intensity factor for this problem and that for a semi-elliptical surface crack in a semi-infinite body or in a finite-thickness plate are discussed. The approximate expression for the stress intensity factor for an internal semi-elliptical surface crack in cylindrical pressure vessels is also given for convenience of practical uses.