Study on the anti-penetration performance of two-layer explosively welded plates impacted by a spherical projectile

The anti-penetration performance of two-layer explosively welded steel/aluminum plates 5 mm thick impacted by a spherical steel projectile 6 mm in diameter with a velocity of 260–900 m/s is studied in this paper. The effects of the thickness distribution and the incident angle on the anti-penetration performance and damage mechanism are analyzed. At incidence angles of 0–60$^\circ$C, the minimum projectile velocity is needed for penetration at the steel/aluminum thickness ratio equal to 2/3. The good coherence of numerical and experimental results indicates that the finite-element method coupled with the smoothed particle hydrodynamics method can predict the anti-penetration performance of two-layer explosively welded plates well.