侵彻作用下负泊松比蜂窝夹芯结构动态响应

With the intensification of war, projectiles pose a serious threat to high-value facilities, and improving the anti penetration performance of various facilities is particularly crucial. Study the anti penetration performance of 3D printed honeycomb sandwich structure through ballistic gun experiments and numerical simulation methods. Compare and analyze the dynamic response of 7 specimens through ballistic impact experiments. The sandwich structure consists of a Q345 steel top plate, a carbon fiber reinforced composite (CFRP) back plate, and an aluminum alloy honeycomb core layer. Three honeycomb core configurations are compared experimentally: foam aluminum, positive hexagon and concave hexagon with Negative Poisson's ratio effect. The results show that compared with the honeycomb sandwich structure with foam aluminum core and positive Poisson's ratio, the honeycomb sandwich structure with Negative Poisson's ratio has lower residual velocity and stronger penetration resistance. The dynamic response process of honeycomb sandwich structure with Negative Poisson's ratio is obtained through numerical simulation. Through parameter analysis, the influence of cell inflection angle, back plate thickness and back plate type on the anti penetration performance of honeycomb sandwich structures with Negative Poisson's ratio is further obtained. The numerical research results indicate that all three factors have a certain impact on the anti penetration performance of honeycomb sandwich structures. The non dominated genetic algorithm is used to optimize the honeycomb sandwich structure with initial Negative Poisson's ratio, and its mass is reduced by 21. 1% under the premise of ensuring the same ballistic limit speed.