The numerical analysis of the formability of aluminium alloy sheet in complex shape box deep drawing forming

This paper analyzes the formability of aluminium alloy sheet X611-T4 in complex shape box deep drawing by means of a ductile fracture criterion, and reveals the effect of shear stress in blank plane on the formability of blank, which at different-radius corner. The obtained results are as follows: (1) the simulated thickness distribution is in agreement with the measured value; (2) the critical punch stroke and the fracture initiation position predicted by the criterion are consistent with the experiment; (3) the effect of friction coefficient, blank holder force and cut-length on the formability is obvious, among which the effect of cut-length is the most remarkable. The result proves that reasonable modification of the processing parameters can obviously increase the formability of aluminium alloy sheet X611-T4.