Multi-stage Inverse Finite Element Analysis of Multi-stage Rectangular Cup Drawing Processes with Large Aspect Ratio Considering Deformation History

변형이력을 고려한 세장비가 큰 직사각컵 성형공정의 다단계 유한요소 역해석

An inverse finite element approach is employed for more capability to design the optimum blank shape from the desired final shape with small amount of computation time and effort. For multi-stage deep-drawing processes, numerical analysis is extremely difficult to carry out due to its complexities and convergence problem as well as tremendous computation time. In this paper, multi-stage finite element inverse analysis is applied to multi-stage rectangular cup drawing processes to calculate intermediate blank shapes and strain distributions in each stages. Deformation history of the previous stage is considered in the computation. Finite element patches are used to describe arbitrary intermediate sliding constraint surfaces.