1Process Technology R & D Laboratories, Nippon Steel Corporation, Kitakyushu
We have analyzed the residual internal stress caused by ball scratching on the surface of grain oriented Si-steel sheets, using a finite element method under the assumptions of (1) isotropic elastic-plastic materials, (2) plane strain, and (3) no bending.
The results are as follows: (1) the tensile stress perpendicular to the surface exists in the neighbourhood of the top surface and the bottom surface under the scratch, ahd (2) in the other region, tensile stress parallel to the surface exists in the direction perpendicular to the scratch. These results explain well the domain patterns observed by many investigators.
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