강-소성 대변형 유한요소법을 이용한 판재성형에 관한 연구 = Study on Sheet Metal Forming by a Rigid-Plastic Finite Element Method Considering Finite Deformation Formulation

다국어 초록 (Multilingual Abstract)

Process modeling of sheet metal forming operations is carried out using the rigid-plastic finite element method based on membrane theory. The sheet materials are assumed to have normal anisotropy and to obey Hill's anisotropic yield criterion and its associated flow rule. The formulation takes into account finite strain and isotropic work hardening during deformation. Triangular elements with linear displacement functions are used to discretize the sheet domain. A constant frictional condition is assumed between the forming tools and sheet.
The axisymmetric punch stretching and deep drawing process are analyzed in order to examine the validity of the proposed finite element formulation. To examine the effects of friction, the various models of axisymmetric punch stretching are analyzed. And then, the calaulated values are represented graphically by the developed postprocessing program.