Multi-stage Finite Element Inverse Analysis of elliptic Cup Drawing with large aspect ratio considering Intermediate Sliding Constraint Surface

중간 미끄럼 구속면을 고려한 세장비가 큰 타원형 컵 성형 공정의 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 expense and computation time For multi-stage sheet metal forming processes numerical analysis is expense difficult to carry out the to its complexities and convergence problem. It also requires lots of computation time. For the analysis of elliptic cup with large aspect ratio intermediate sliding constraint surfaces are difficult to describe. in this paper multi-stage finite element inverse analysis is applied to multi-stage elliptic cup drawing processes to calculate intermediate blank shapes and strain distributions in each stages. To describe intermediate sliding constraint surfaces an analytic scheme is introduced to deal with merged-arc type sliding surfaces.