The present research work related to optimal experiment selection of bimetallic sheet hydroforming process using multi attribute decision making (MADM) techniques. The numerical simulation of the operation has been done applying ABAQUS software. The studied geometrical variables include the punch tip radius (Rp), the die entrance radius (Rd) and the clearance between the punch and matrix (CL), and the target parameters are the maximum thickness reduction and thickness variation of the final product. In order to calculate the weight of the objective function in sheet hydroforming process, criteria importance through inter-criteria correlation (CRITIC) and method based on the removal effects of criteria (MEREC) techniques are employed. In the following, technique for order preference by similarity to ideal solution (TOPSIS) has been used to evaluate the numerical test and asses the best case. The results demonstrated that the weighting coefficients of the two objective functions, namely thickness reduction and thickness variation obtained from CRITIC and MEREC methods was almost the same, and their values are approximately calculated to 0.6 and 0.4, respectively. Based on the optimization outcomes, the optimal values of Rd, Rp and CL were gained 6 mm, 4 mm and 2.2 mm, respectively.
