Research On Joint Damage Of Fragments And Shock Wave To Composite Armor

Anti-ship missile is a fatal threat to surface ships.An anti-ship missile hits the target,which is enough to make the ship lose its combat effectiveness or even sink.Ship protection structure is the last line of defense of ships.Whether it can "digest and absorb" the explosion shock waves and fragments produced by anti-ship missiles that have successfully penetrated,and ensure that the damage or destruction degree of ships is controlled within the allowable range,which is directly related to the vitality of the whole ship.Therefore,it is of great military application value to carry out the research on ship composite armor anti-explosion and anti-impact.Composite materials and new structures are the important development direction of ship protection.In this thesis,firstly,the ship composite armor is designed and manufactured,and according to the characteristics of the semi-armor-piercing anti-ship missile warhead,the scale model of the hemispherical head cylindrical warhead used in the experiment is established,and the scale ratio of the scale warhead to the prototype bomb（200kg TNT equivalent）is 1:3;Then,the damage element characteristics of warhead,including fragment velocity,fragment mass distribution and shock waves overpressure,are studied by numerical simulation and theoretical calculation;Finally,the cabin scale model is established and the composite armor is installed at a distance of 1.67 m from the warhead,and the combined damage of the warhead explosive fragments and shock waves to the composite armor is experimentally studied.The results show that:（1）The fragments produced by the explosion of the hemispherical head cylindrical warhead have the highest velocity in the cylinder far from the initiation point,which can reach 1500m/s,and the fragments with mass of 1～5g account for 42% of the maximum,followed by fragments with mass less than 1g accounting for 17%,fragments with mass greater than 55 g accounting for 5%,and fragments with mass less than 10 g account for an average velocity of 1100～1300m/s,and fragment velocity with mass greater than 10 g is between 1000～ 1200m/s.（2）The combined action of shock waves overpressure of 2～9MPa and fragment group caused by warhead explosion caused serious deformation and tear cracks on the upper and lower decks,left and right transverse bulkheads and outer plates of the cabin model;（3）Under the combined damage of fragments and shock waves in the cabin model（fragments precede shock waves）,the steel plate in front of the composite armor was penetrated by more fragments at the position facing the warhead,and the maximum deformation deflection of the steel plate after 3D scanning of the composite armor was 54.3mm,but there was no obvious damage to the rear steel plate and no obvious tearing cracks around the periphery,which indicated that the designed composite armor had a certain protective effect.