탄소성 유한요소법에 의한 박판 성형 공정의 해석(I)-유한요소법의 수식화 및 정수압 벌징에의 응용-

Abstract

An incremental formulation incorporating the effect of shape change is derived for non-steady large elastic-plastic deformation of rate-independent anisotropic sheet material. The kinematics of deformation during each step is considered by employing the natural convected coordinate system. From the derived formulation, a finite element code is developed with membrane elements. Hydrostatic bulging of a circular diagram and hydrostatic bulging of a square diaphragm are analyzed in order to check the validity of the present formulation. The computed results are compared with the existing experimental results as well as the results of rigid-plastic FE analysis. The comparison has shown that the computation is in good agreement with the experiment and the rigid-plastic FEM results.