Simulation Research On Damage Of Parallel Combined LEFP To Rod Armor-piercing Projectiles

With the continuous development of The Times,shaped charge and various high and new technologies develop rapidly,the survival environment of armored vehicles on land battlefield gradually becomes extremely complicated In this paper,taking the active protection system as the research background,in order to enhance the damage effect of LEFP on armor-piercing projectiles,a parallel combined LEFP is proposed,which generates multiple damage elements at one time,and conducts research on the interference rod kinetic energy armor-piercing projectile.It provides a reference for the research of new weapons and the protection of armored vehicles.Firstly,the main types of anti-missile damage elements in active protection systems are summarized,and the research status of active protection systems and linear explosive shaped charges at home and abroad is introduced.Secondly,Ls-dyna /3D was used to study the influence of explosive thickness,radius of curvature and height on LEFP formation,the conclusions are drawn:（1）There are differences in the speed and shape of multiple LEFPs formed by parallel combined LEFPs.The speed and shape of the LEFP in the middle position are close to the shape,and the parallelism is good.The LEFP in the outer position has a small speed,deflects outward,and has poor flight stability.The larger the thickness of the liner,the larger the volume and mass of the formed pair of LEFPs,and the smaller the head velocity of the LEFP.With the increase of curvature radius,the velocity of LEFP head increases,the length-diameter ratio decreases,and the section is more dense.With the increase of charge height,the charge quantity increases and more energy is generated to increase the velocity of the head of the formed penetrant body,and the head velocity of the formed penetrating body will increase,but the large dynamite will also bring many side effects,which will also affect its penetration performance.（2）In dynamic interception,appropriately reducing the aspect ratio is beneficial to the interference of armor-piercing projectiles.The larger the radius of curvature of the liner is within the range of 0.9D～1.2D,the better,the thickness of the liner is selected within 0.06D～0.1D,and the height of the explosive is selected within 0.8～1.0D.The penetration body formed within this range is opposite to the rod.The interference ability of armor-piercing projectiles is better.Then,the structural parameters of LEFP charge are optimized by orthogonal optimization method.The conclusions are as follows :（1）the main sticking point and secondary cause of the influence of each structural parameter of liner on the maximum head speed of the damage element is height of the explosive > thickness > radius of curvature.（2）The optimal optimal level is H =1.0d,B =0.07 d,R=1.2d.The penetration body formed under the shaped charge structure can completely cut off the rod armor-piercing projectile,reducing the volume of14.3cm3 and the mass of 243.1g.The penetration depth of damaged armor-piercing projectile to the aftereffect target plate is 148.5mm,and the hole area is about 773.9mm2.By comparison,the penetration depth of the armor-piercing projectile to the aftereffect target plate in the interference state is greatly reduced by 50.4%,and the aperture increases by 59%.Finally,the numerical simulation analysis of the interception process of the high-speed rod kinetic energy armor-piercing projectile by the parallel combined LEFP under different intersection modes is carried out,and the conclusions are obtained:（1）kinetic energy loss on interception Angle change of penetrator approximation performance increases first and then change trend,but the LEFP Angle and the speed of the rod penetrator is too big or too small are unfavorable.In a small range of 90° or so,the jamming effect at acute Angle is generally better than that at obtuse Angle.（2）The best intersection position is the front,middle and rear（whole body）of the armor-piercing projectile,followed by the middle and rear of the armor-piercing projectile.The penetration depth is generally smaller than when the intersection is in the front and middle of the armor-piercing projectile.（3）When the interception angle is 84°,under the three intersection positions,the projectile has the largest kinetic energy loss and the smallest penetration depth to the target plate.