Inverse Identification Of Materials Imployed In Sheet Metal Simulation Based On The Combination Of The Finite Element Method (FEM) And The Genetic Algorithm (GA)

The techniques employed to obtain the accurate parameters of the sheet metal forming is very important for sheet metal forming with plastic anisotropy and very essential for the design of die/punch.An inverse method is suggested to obtain accurate parameters of the sheet metal forming in this paper, and this inverse method based on experiment,forming simulations and opitimization. We draw accurate force- displacement curves from the uniaxial tensile testing from three orientations. And with this data, a simulation which used the finite element method (FEM) is performed. Therefore we get new force- displacement curves. The FEM is employed to calculate the responses of a blank sheet and the GA adjusts the material parameters so that the calculated responses match the measured one in a least-square sense. The influnces in the simulations carried by the size and the model of elements are brought into consideration as well as the yield criteria. In the inverse method we employ the genetic algorithm (GA) to calculate and bring Pcross ,Idum and Seach space into dissicusion.We will bring AL6111-T4 and 5754-O into consideration in the simulation process.