실린더 형상 구조물의 변형손상에 대한 잔류응력 평가

In heavy industrial fields such as power plant and chemical plant, it is often necessary to restore a damaged part of large machinery or structure which is installed in the hazard working place. In this paper, to estimate residual stresses during the process of damaging and restoring of cylindrical beam structure, a finite element technique has been used. The variations of residual stresses on the process of damaging and restoring for surfaces and cross-sections have been examined. The results show that the maximum von Mises stresses occur outer cylinder surfaces of boundary between cylindrical beam support and cylindrical beam when deformation procedure and restoring force is applied. The maximum residual stress remain 158.6㎫ in the inner wall and this value correspond to 53% of yield stress when deformation and restoration procedure is finished.