FORMING-LIMIT ANALYSIS OF HEMISPHERICAL-PUNCH STRETCHING USING THE 3-DIMENSIONAL FINITE-ELEMENT METHOD

The deformation analysis of hemispherical-punch stretching was perform ed using the three-dimensional finite-element program ''ROBUST''. The effects of the material properties on strain distribution and historie s of the deformation processes were investigated. Using FE-calculation results and forming-limit curves proposed by Storen and Rice, the lim iting cup height and rupture location were predicted for mild steel, h igh-strength steels, austenitic stainless steel and aluminum alloy. Th e calculated values agree very well with the experimental data. The re sults can be expected to contribute to predictive evaluation of materi al performance using computer simulation.