关键词: 复合挤压, 数值模拟, 表面裂纹, 缺陷预测, 韧性断裂准则

Abstract:

A rigid plastic finite element method is used to simulate the process of the cup rod combined extrusion. The curve of load versus stroke is calculated and the regularity of metal flowing is studied. Moreover, according to the stress and strain fields of the deformation part achieved by calculation, a ductile fracture criterion is adopted to predict the crack defects appearing on the surface of the part during the deformation. The numerical results agree well with the experimental ones.

Key words: cup-r od combined extrusion, numerical simulation, sur face cr ack prediction, ductile fractur e criteria