Guo Yuqin1,Li Fuzhu2,Jiang Hong1,Wang Xiaochun1
(1.School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049, China;2.Technology Institute,Xuzhou Normal University,Xuzhou 221011,China)
Abstract:It is suggested that in sheet metal forming simulation, within each increment step of dynamic explicit non-linear finite element method,the fuzzy reasoning is adopted to estimate the states of stress and strain of the stamped part and to deal with the corresponding process expert knowledge.Moreover,a second order optimization model,taking the die opening radius,the blank holder force,and the drawbead constraint force as the design variables and the slightest wrinkling tendency without any fracture as the objective function,is established to determine automatically the above mentioned process conditions with the hierarchical optimization searching strategy.The numerical simulation of forming process of a typical Dashpot part is performed with the process conditions obtained by the proposed determination method in DYNAFORM and the results reveal a good agreement with the available conclusions and practical experience.
Keywords:sheet metal forming;fuzzy reasoning;non-linear finite element method; hierarchical optimizing;process condition