Influence of body force effect of the pulsed magnetic forces on the dynamic forming limits of AA5052 sheets

To reveal the hyperplasticity mechanism of sheets during electromagnetic forming(EMF),the experimental scheme considering the body force effect of magnetic forces was established by using the drive plates or not to make a comprehensive comparison of the influence of the body force and the surface force on the forming limits of 5052aluminum alloy sheets.The body force effect of magnetic forces is discussed.Results show that the body force characteristic of the pulsed magnetic forces plays a positive role in promoting the formability of sheets during sheet metal electromagnetic forming(EMF)process,which will help to spread deformation and thus to increase the level of overall plasticity.Besides,with increasing deformation rate,the body force effect becomes more significant and the limit deformation capacity increases markedly.