Abstract
The perforation behaviour of Cymat© aluminium foam at various impact loading rates was studied both experimentally and numerically. Perforation tests were performed with an inverse perforation setup using a split Hopkinson pressure bar (SHPB) system at speeds up to 40 m/s. Compared with a quasi-static test using the same specimen and clamping system, a significantly enhanced piercing force was found under impact loading. Numerical simulations of the perforation test were carried out using LS-DYNA code, and the material models available in this code were benchmarked. Good agreement was found between the experimental and simulated force/displacement curves when using the honeycomb material model with an appropriate failure criterion. The simulation revealed that a strain discontinuity front propagated ahead of the perforator when the impact velocity of the perforator exceeded 20 m/s. The significance of this numerical model is that it demonstrates that the main feature (average perforation force) can be reproduced with a rather simple pre-implemented material law for a homogeneous specimen. An analytical model using the concept of a shock front with a power law densification assumption is proposed to describe the enhancement in the impact piercing force.
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