Numerical and Experimental Investigation of The Dimpling Process for Aluminum Alloy

In this work, adding dimple to AL1100 sheet was experimentally and numerically studied. The behaviour of the plate during the forming process was simulated for several punch diameters, dimple different heights, and different plate thickness. The punch travel which indicates the dimple height before plate fracture was obtained from the numerical results of punch load and effective strain curves. The deformation along the dimple thickness is nonuniform and failure may occur along the dimple wall or at the die nose fillet. Improvement in thickness distribution along the dimple wall can be achieved when using the natural rubber to assist the dimpling process.