溶接線に近いき裂の衝撃力による成長
1989 年 55 巻 511 号 p. 500-503
詳細
1989 年 55 巻 511 号 p. 500-503
Impact tensile experiments were carried out at 77K for welded steel plate specimens. Four types of specimen, with a crack at different distance from the weld line, were used The dynamic strain behavior was measured on each specimen. Reduction in dynamic fracture toughness Kdc was discussed in comparison with static Ksc. The main reason was attributed to the negligible blunting of the crack tip in the case of impact loading, and the effect of dislocation emission on the blunting was discussed. The scattering of Kdc increased considerably with the increase of impact velocity when a crack was on the weld line.
