Investigation on thermoplastic deformation behavior of aluminum alloy sheet

In order to investigate the thermoplastic deformation behavior of aluminum alloy sheet,warm bulging test is conducted to obtain bulging pressure-height curves with different temperatures and pressure rates. Then the influence of pressure rate on bulging height is summarized. Based on the relation between pressure rate and strain rate under the same pressure rate and different temperatures,the fitted equation of bulging pressure on equivalent strain and pressure rate is proposed. The functional relation between pressure rate and strain rate is also obtained. The results of warm hydraulic bulging experiments indicated that the pressure rate,which has a significant effect on the deformation behavior of metal material,can characterize the deformation speed in the process of warm sheet hydroforming.