マトリクス法破壊力学による軸方向き裂付き内圧円筒の混合モード応力拡大係数評価
1992 年 58 巻 548 号 p. 531-538
詳細
1992 年 58 巻 548 号 p. 531-538
In this paper, mixed mode stress intensity factors for one or more symmetric and asymmetric axial cracks in pressurized cylinders are calculated using a simple approach which we proposed in our previous work. Effects of parameters on both KI and KII are investigated systematically concerning ( 1 ) diameter ratios, ( 2 ) relative crack depths, ( 3 ) the number of cracks, ( 4 ) pressure acting on crack face, ( 5 ) the presence of cracks with unequal depth, and ( 6 ) the asymmetric arrangement of cracks. Then, the results obtained are summarized as follows : ( a ) KI for two symmetric internal axial cracks (=KI) is the largest of all that for other axially cracked configurations : ( b ) KII is always negligible in unstable fracture prediction ; ( c ) the differences in KI for various cracked configurations in thin-walled cylinders are so small that KI is not so conservative in fracture evaluation ; and ( d ) accurate closed-form expression of KI is obtained for practical use.
