Finite element simulation and experimental study of non-blank holder forward and backward composite deep drawing earing test

In the traditional earing test process, the pressure and friction brought by the blank holder are huge, resulting in complex stress on the plate unit, and it is impossible to determine how they will affect the macroscopic performance of the anisotropy of the sheet, which is likely to lead to deviations in the shape of the earing produced by the earing test. To improve the forming effect of the earing test, a test method of non-blank holder forward and backward composite deep drawing is proposed, and the influence of the blank holder on the earing process is eliminated. The forward and backward composite deep drawing process is simulated using finite element software Dynaform, and the appropriate test mold parameters are determined. The mold is designed using the optimal parameters obtained by finite element simulation, and physical experiments are carried out. The simulation results and experimental results both show that observable earing can be obtained by the proposed test method, which proves the feasibility of the test method.