Anti-Penetration Performance Of Steel/Composite Armor Structure

In modern marine warfare,ships are threatened by various weapons such as anti-ship missiles from the air and underwater,torpedoes and mines.Among them,the high-speed fragments produced by the explosion will invade important compartments such as fuel tanks,ammunition depots,and command rooms.It is the main threat faced by large and medium-sized ships.Protective armor can prevent the intrusion of projectiles and fragments,and provide effective protection for equipment and personnel.In recent years,with the increase of fragmentation speed and the limitation of ship displacement,the protective armor needs to meet the requirements of high anti-penetration performance and lightweight design at the same time,and designing the protective armor structure with stronger anti-penetration performance and lower equivalent density is of great significance.Steel is a traditional protective material,its strength and hardness is higher,but its density is larger.Fiber reinforced composites(such as aramid,UHMWPE,etc.)are ideal penetration resistant materials due to their low density,high specific modulus and excellent tensile properties.The composite armor structure formed by the combination of steel and composite material can realize high penetration resistance and lightweight simultaneously.In order to research the steel,aramid fiber and ultra-high molecular weight polyethylene fiber reinforced composite material made of elastic composite armor structure,we use nonlinear finite element software ANSYS/ls-dyna was analyzed by using the numerical simulation of the bullet penetration steel,aramid fiber reinforced material,ultra-high molecular weight polyethylene fiber reinforced composite armor materials.We also studied the influence of different structure and related parameters on the penetration resistance performance of composite armor,and simulated and analyzed the influence of different bullet warhead shapes and different bullet incidence angles.The results show that shear and tensile failure mainly occur during the process of steel plate penetration,while shear,interlaminar debonding and tensile failure mainly occur during the process of fiber reinforced composite penetration.For the composite armor structure combining steel plate and composite material,if the steel plate is placed in front,the composite armor has stronger penetration resistance performance;With the increase of the thickness of the back plate,the penetration resistance of the composite armor is obviously enhanced,but its specific energy absorption decreases.When the composite armor is composed of aramid and UHMWPE,under the same surface density,the configuration in front of aramid has stronger penetration resistance,which can effectively exert the excellent tensile properties of UHMWPE and absorb more energy.Under the condition of the same bullet weight,the ball head bounce has better penetration ability than the flat bounce.With the increase of the incidence Angle,the penetration ability of the flat head projectile decreases significantly.