Comparative analysis of explosion resistance of honeycomb sandwich structures with different Poisson's ratios

Abstract

The honeycomb sandwich structure is widely used in ship explosion protection due to its excellent impact resistance. To explore the effect of Poisson's ratio on the anti-knock performance of honeycomb sandwich structures, a numerical analysis of the underwater anti-knock performance of honeycomb sandwich structures with different Poisson's ratios is conducted in this paper. Different honeycomb sandwich structures with three types of Poisson's ratio (positive/negative/zero) and the same relative density and elastic modulus are selected, and the underwater anti-knock performance is compared and analyzed by using the numerical method. The size of the breach, the maximum displacement of the center point of the backing plate, and the total energy absorption value of dimensionless normalization when the structure is subjected to underwater explosion loads are analyzed comprehensively. Results show that the comprehensive anti-knock performance of the four-pointed star honeycomb with zero Poisson's ratio is the best, followed by the honeycomb with negative Poisson's ratio, and the hexagonal honeycomb has the worst anti-knock performance, which provides a reference for the application of honeycomb sandwich structure in underwater explosion protection structure.