Controlled strain path forming process with space variant blank holder force using RSM method

Three dimensional principal strain surfaces of one element were drawn which displayed the obvious trend varied with the space variant blank holder force. The model adequacy was checked and confirmed using ANOVA method. However, four extra sets of numerical simulation were carried out to compare with the value predicted using Response Surface Method (RSM). The good consistency confirms the effectiveness of this empirical equation within the plasticity field. With the assistance of the empirical model, it is feasible to acquire a fracture free product through regulating a suitable blank holder force profile. The space variant blank holder system could be widely used to form a product with complicated shape, especially body panels in the automotive field.