Application of an expert drawbead model to the finite element simulation of sheet forming processes

An expert model developed for the simple description of the drawbead in the numerical simulation of stamping processes is introduced. The drawbead restraining force and bead-exit thinning that the expert drawbead model calculates employing the drawbead dimensions and forming variables are used as a boundary condition of the node nearest to the drawbead position. In order to show the efficiency and accuracy of the expert drawbead model, the numerical simulation of auto-body panel stamping is performed. The new numerical model provides an accurate solution and stable convergence. It also has merit in not requiring excessive computation time.