Numerical analysis of relationship between height and geometry of bottom of a beverage can and its resistance to increase in internal pressure

Dome reversal pressure test is one of crucial quality tests required of such products as beverage cans. It gives information about resistance of a bottom in conditions of increased internal pressure. The information is important both for producers of carbonated beverages and final users. The test identifies the maximum internal pressure, which does not cause reversal buckling of a dome. To conduct analyses of the test, a separate numerical module was created. The module may be integrated with LS-Dyna Solver. The analysed geometries of a bottom were modelled in Dynaform 5.9.1 with the use of LS-Dyna too. The numerical simulations are aimed at analysing the influence of geometry and height of a bottom in a cylindrical drawpiece on results of dome reversal pressure test. Another point of interest in the analysis was the influence of friction factor and velocity of a punch on forming a bottom and its results during a reverse dome pressure test. Taking into account the character of the reversal dome pressure test, these forming parameters cause a change in material flow and distribution of thickness on a dome. It influences final resistance to an increase in internal pressure. The material used in the analysis was 3104 aluminium alloy work hardened to H19 temper. The comparisons were conducted on 2 thicknesses of input stripes: 0,250 and 0,241. The module used in the analysis included a full history of deformation that resulted from preceding simulations of drawing and redrawing.