Anti-penetration performance and design of composite hangar door under long rods impact

Abstract

To address the threat of long rods projectile (LRP) to hangar doors, this study designed a metal-UHMWPE composite armor door, comprising G50 steel front and rear face sheets, a Q345 steel honeycomb core, and filled UHMWPE laminates. A finite element (FE) model was established using the LS-DYNA software to verify the protective performance of the structure. The anti-penetration behavior of three configurations with identical areal density but varying face sheet thicknesses was analyzed under an impact velocity of 340 m·s−1. Results indicated that the composite door with a “thick front face sheet + thin rear face sheet” configuration could successfully resist long rod projectile (LRP) penetration. Compared to the traditional monolithic steel armor, it achieves a 4.7% weight reduction. The thick front face sheet effectively eroded the penetrator body, blunted the warhead, and reduced the projectile’s penetration capability. This study clarified the failure mechanism of the composite structure door, providing support for the design of high-performance hangar doors.