抄録
Residual-stress redistribution caused by making a full-depth hole in a plate with biaxial residual stresses was elastically calculated using the Finite Element Method (FEM). The initial residual stresses were introduced into each finite-element through the intermediary of the most suitable eigen-strain distribution in such a way as to accord with the X-ray residual stresses measured prior to the material removal. A new calculation method is also proposed which removes at a time all the finite-elements of the removal-area in the FEM analysis, in contrast to the conventional method in which the elements are removed one by one. The analytical results of residual-stress redistribution were in good agreement with the X-ray residual stresses measured after drilling with an end mill, in the plate with residual stress induced by welding or by water-cooling. These results show that the residual stress change due to the material removal occurs markedly in the vicinity of the removed place.
