Re-identification problems in forming of rigid-visco-poroplastic materials

A unified approach for parameter identification of a visco-poroplastic material model is presented. A repressing powder forging process is analyzed. The numerical solutions for direct and inverse problems have been described. The inverse problem is solved by the use of gradient-based methods and a sensitivity analysis. Numerical examples of the method proposed are presented, in which one and two parameters of the visco-poroplastic material model were identified. Copyright q 2007 John Wiley & Sons, Ltd