전단볼트의 파단부형상과 동적파단특성과의 관계

초록

In this paper, dynamic experiments were carried out to study the effect of a gap (g), which is defined as a radius of curvature in the shear fracture area, on the shear fracture characteristics of the shear bolt with two kind of bolts (g=4mm, 6mm). The response of the bolt is compared in terms of mean fracture force and absorbed energy during the impact period. A high speed digital camera is used to confirm process of the shear deformation of the bolt. It was found from experiments that the variation of fracture forces is almost the same, regardless of the gap. However, the shear deformation at g=6mm is higher than that at g=4mm. The results of the finite element analysis indicate that the fracture at g=4mm occurred earlier than that at g=6mm and initiated from the outer surface of the shear fracture area.