Section: New Results

Plastic impact of iron on aluminium

A new model for plasticity has been developed this year. An iron projectile is impacting an aluminium plate immersed in air. The initial horizontal velocity of the iron is $1000m.s^{-1}$. The computation is performed on a $2000\times 1600$ mesh with 144 processors. Homogeneous Neumann conditions are imposed on the left and right borders and embedded on the top and bottom.

The results are presented in Fig 6 with a schlieren image (bottom) and the von Mises criteria (top) at different time steps. A log scale is used and the minimum value is fixed to ${10}^9$. We can see that the plate is strongly deformed and form at the end a filament. The projectile is flattened but not as much as in the literature because the yield plastic limit is higher. We see a longitudinal wave propagating in the plate followed by a shear wave that causes the plasticity of the material.

Figure 6. Impact of Iron on Aluminium TC2. Schlieren image and von Mises criteria at $t=0.03$ms, $0.06$ms, $0.13$ms, $0.26$ms, $0.53$ms and $t=1.04$ms from left to right, top to bottom