FINITE ELEMENT ANALYSIS OF WRINKLING DURING CUP DRAWING

This work focuses on the analysis of the NUMISHEET 2014 Benchmark 4 Wrinkling during cup drawing, which had as objective to investigate the effects of geometry and the materials model on a dome wrinkling (puckering) behavior. Two different punch geometries were proposed and two materials were selected: an aluminum alloy, AA5042, and a mild steel, AKDQ. The mechanical behavior of both materials is described using a Voce type isotropic work-hardening law combined with two yield criteria: Hill'48 and Cazacu and Barlat 2001. The study highlights the influence of the in-plane mesh refinement and of the yield criterion adopted. The comparison between the numerical and the experimental results is presented to evaluate the effectiveness of the yield criterion selected. Following the benchmark description, the main process parameters studied are the punch force evolution and the cup radial coordinate versus the angle from rolling direction after the drawing process. The results show that accurate wrinkling prediction requires a good selection of the in-plane mesh refinement but also an accurate description of the orthotropic behavior of the material.