Abstract: Based on the triangular membrane element model, a high precision inverse approach with finite element is deduced. The process parameters, such as friction, holding force and drawbead force are considered. The blank shape, the final distributions of stress and strain, and the thickness change corresponding to the stamping parts, can be calculated by this program. The effectiveness and accuracy of the inverse approach method in blank design are validated by a typical example of a coneshaped basin. The results show that inverse approach is an effective approach for blank design, which can be used to evaluate the sheet metal forming process quickly and to optimize the stamping technological parameters.

Key words: blank design, finite element inverse approach, sheet metal forming simulation , triangle membrane element