Research On The Anti-penetration Performance Of High-speed Fragmentation Of Composite Armor For Ships

With the rapid development of various anti-ship weapons such as anti-ship missiles,torpedoes and naval guns,the vitality of ships is facing more and more serious threat of explosion damage.The semi-armor-piercing blasting warhead,with the help of its initial kinetic energy,makes the warhead penetrate into the interior of the ship and explode.After the explosion,a large number of fragments will be produced.These fragments,with extremely high initial kinetic energy,will continue to penetrate into the hull structure to form cracks or perforations,and even damage to personnel and equipment in the cabin.Therefore,in order to improve the safety of important cabins of the ship and ensure the vitality of the ship,the research on the protection design and anti-penetration performance of the ship’s composite armor is very important.In this paper,combined with the "shape effect" of the bullet-resistant unit and the idea of destabilizing the flight attitude of the projectile,a ceramic/aluminum alloy/high-strength polyethylene fiber composite armor structure composed of a ceramic layer and a sandwich layer was designed,and the anti-penetration mechanism and performance were studied.The details are as follows:(1)A composite armor structure design plan-a “sandwich” structure with a ceramic hemisphere and a ceramic panel as the deflection layer,and an energy-absorbing layer composed of the front and rear aluminum alloy layers and the middle layer of high-strength polyethylene core material was proposed.The verification research on multilayer composite armor materials was carried out.According to the results of ballistic impact experiments,the process of projectile penetrating the target plate is analyzed,and the reliability of material performance parameters and numerical calculation method was clarified.(2)Numerical simulation of high-speed fragment penetration into composite armor was carried out by using ABAQUS/Explicit display dynamics analysis software.The failure mode and ballistic resistance mechanism of composite armor was analyzed.The effects of projectile target parameters such as projectile head shape coefficient,incident angle,aluminum alloy position distribution,clearance target distance,ceramic radius,ceramic distance and impact point on the protective effectiveness of ceramic/aluminum alloy/high-strength polyethylene fiber composite armor were revealed.(3)In order to improve the elastic resistance of ceramic/aluminum alloy/high-strength polyethylene multilayer composite armor,the optimal design of the fiber layup direction and the thickness of the armor layup in the multilayer composite armor was carried out based on the response surface analysis algorithm.The Box-Behnken experimental design method was used to design the scheme.The thickness of each layer of the laminated armor was used as the design variable,and the structural specific energy absorption of the laminated armor was used as the design goal.The design sample points were numerically calculated,and the response surface model of the specific energy absorption of the laminated armor was established through variance analysis and parameter estimation.The genetic algorithm was used to optimize the response surface equation,and the correctness of the optimization results was verified.A certain basis for the lay-up design of multi-layer composite armor was provided.