Some improvements on the one-step inverse isogeometric analysis by proposing a multi-step inverse isogeometric methodology in sheet metal stamping processes

The isogeometric methodology has been successfully implemented in one-step inverse analysis of sheet metal stamping processes. However, these models are not capable analyzing forming processes that require severe deformation and several stages. This paper presents a multi-step to enhance the precision predictions initial blank, strain distributions, drawability formed parts. deals with minimization potential energy, theory plasticity, considering membrane elements. presented utilizes NURBS basis functions create final, middle, blank geometries also analyze deformation. characteristics applied formulations make it possible simultaneously observe effects changing part parameters on its formability. One advantage this approach is linear system governing equations solved without concerning about convergence. Besides, can generate middle geometry restrict movements physical nodes along surface, by presenting new NURBS-based mapping sliding constraint technique. performance model experimentally numerically evaluated under two classical problems, including rectangular box two-step drawing circular cup. Results comparisons indicate credibility prediction at low computation time.