せん断端面の残留応力に与える亀裂進展の影響

抄録

The purpose of this study is to clarify the effect of deformation during crack growth on the residual stress of sheared edges. By measuring the residual stress in the thickness direction of the sheared edge, the residual stress of the sheared edge on the scrap side was found to be larger than that on the product side. It was also found that this residual stress difference depends on the shearing clearance, and the difference becomes smaller with greater clearance. By experiments and numerical analysis, it was clarified that the difference in residual stress between the two sheared edges is due to the deformation caused by the Mode II growth of cracks. When the clearance is large, the growth of Mode I cracks increases and that of Mode II decreases, so it is considered that the stress difference between both edges becomes smaller.