單位體격자 재구성법과 弱型격자 재구성을 이용한 3차원 볼단조의 유한요소해석

Abstract

A systematic method of remeshing is required due to severe mesh distortion after some finite deformation in the finite element analysis of practical forging processes. In order to cope with the problem of mesh degeneracy during deformation, the proper design of meshes plays an important role in the analysis. In the present paper, a new systematic approach of three-dimensional remeshing, so-called modular remeshing, is employed for the finite element analysis of forging. An automatic renoding scheme is also employed as weak remeshing for the finite element analysis of large deformation. As an example, three-dimensional ball forging from a square block is simulate ed using newly developed basic modules by the general rigid-viscoplastic finite element method. Criteria for the renoding are automatically checked and the renoding scheme is carried out fully automatically. Model experiment with plasticine is carried out to check the validity of the remeshing schemes for three~dimensional ball forging. Comparisons between the computed results and the experiments show that the proposed scheme can be effectively applied to metal forming processes of large deformation in connection with modular remeshing.