Abstract
In this paper, the response of sandwich panels (Glass/Epoxy/PU Foam) to projectile impact in the velocity range of 30—100 m/s was studied. Three sets of sandwich plates (WRM/Epoxy/Foam, CSM/Epoxy/Foam, and WRM/CSM/Epoxy/Foam) were used. A piston-type gas gun setup was used to accelerate a cylindro-conical mild steel projectile of mass 558.6 g. From the experimental results, the ballistic limit, residual velocity, and the energy absorption were found. The ballistic limit decreased as the trend moved from WRM to CSM. Debonding was observed in pure WRM/Foam laminates, whereas this was not the case for the other two sets of panels. Plugging occurred when the projectile struck CSM/Foam sandwich panels, which was not observed in the other two sets. A mathematical model was proposed to predict the ballistic limit, residual velocity, and the energy absorption based on the energy-balance principle. The experimental results were compared with the proposed model, which showed good agreement.
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