Numerical Simulation of Multi-Step Deep-Drawing Processes: Trimming 3D Solid Finite Element Meshes
A.J. Baptista, J.L. Alves, M.C. Oliveira, D.M. Rodrigues, L.F. Menezes
The implemented strategy of DD3TRIM consists firstly, to evaluate the elements that are to be eliminate/keep with the trimming and then adjust the remaining affected elements of the boundary to the desired trim geometry. This adjustment is done by node stretching technique for two different projection schemes with optimization of the final element shape at the boundary. Additionally, a splitting option is also introduced which allows, for instance, to open rings or other closed meshes. The implemented solutions were tested in the simulation of a multi-step deep-drawing benchmark test that consists on cutting a ring specimen from a drawn cup and then splitting it longitudinally along a radial plan. The process consists in a sequence of drawn, spring-back, trimming, splitting and final springback. All this steps were simulated with the DD3 family codes (DD3IMP, DD3OSS and DD3TRIM). In this example application problem, both algorithms (trimming and splitting) have show good reliability to treat the meshes during the multi-stage processes.