关键词: 柱面蜂窝结构, 负泊松比, 钢板, 泡沫铝弹, 局部强动载

Abstract: To address the challenge of explosion protection for ground steel storage tanks in oil storage facilities, a two-dimensional cylindrical double-trapezoidal auxetic honeycomb sandwich structure (CDT-AHSS) has been developed to serve as an ‘explosion-proof shield’. The structural design incorporates an interrelationship between geometric parameters that resolves assembly misalignment issues and enable the prediction of relative density. Through experimental tests and high-fidelity finite element simulations, the mechanical performance of CDT-AHSS-protected steel plates was evaluated under impact loading using cylindrical flat-bottomed foam aluminum projectiles (impact velocity: 254 m/s) to simulate localized blast effects. Results demonstrate that under localized, intense impact loading, the CDT-AHSS exhibits significant auxetic deformation characteristics. The synergistic effects of secondary non-uniform porous reconstruction, low trapezoidal blocking resistance, and high trapezoidal structural deformability result in superior performance compared to cylindrical hexagonal honeycomb sandwich structure (C-HHSS) with equivalent mass and height. Specifically, CDT-AHSS demonstrates reduced overall deformation, lower peak vibration velocity, and improved dispersion of local impact loads. However, challenges persist in the riveted interface process, which fails to fully ensure the continuity of stress transmission and the coordinated deformation across the entire structure.

Key words: cylindrical auxetic honeycomb, negative Poisson's ratio, steel plate, foam aluminum projectile, local strong dynamic load