. The most common and easiest of them is the one maintaining the maximum strain rate value at a constant level.
MSC.MARC was implemented to calculate a pressure regime for a forming of an aircraft part. Rectangular sheet was formed in a die with two cavities of a complex hexagonal shape shown in the Fig. 7. Four-node shell elements were used in the simulation. Two pres- sure regimes were calculated using the rheological data obtained by the tensile test and by the free bulging test series. The pres- sure regimes were calculated to maintain the maximum strain rate
at the value of 10−3 s−1. The results are illustrated in Fig. 8, the
moments of contact with the die for each cavity are pointed by the markers.