재료 1 및 2에 있어서 발생한 굽힘 자국은 응력(F3)을 부여한 영역과 부여하지 않는 영역의 경계에서 발생하였다.
The bending marks generated in Materials 1 and 2 were generated at the boundary between the area to which the stress F3 was applied and the area to which the stress F3 was not applied.