열박음해석을 고려한 이종재 금형의 취성결함성장에 관한 연구

Abstract

The failure of die often occurs as a result of growth of microcracks - referred as a brittle damage. In this study, an analysis of the brittle damage evolution coupled with the elastic finite element analysis of dissimilar materials die deformation is presented. A local transformation from the tractions of a workpiece mesh to those of a die mesh is developed. Using heat shrink fit analysis, initial stress of the insert die is computed. The brittle damage is defined as a vector considering the shape of common microcracks in the brittle metals and the damage function suggested by Krajcinovic is utilized. Applications of the proposed model to modeling damage evolution in the one material on die and the dissimilar materials die are given and the characteristics of brittle damage evolution in die are examined in detail.