Ceramic Composite Armor Penetration Ability Of Numerical Simulation

The research of bullet penetration ceramic composite targets has great significance both in military and engineering, and so that it always attracts the attention of scholars at home and abroad. It has important meaning for the structure design of the protective engineering.In this paper, finite element analysis software LS-DYNA was used to study the damage and its physical process of projectile and target during the process of impact projectile invading into armored materials which based on flat bombs and round shells of diameter 12.7mm and translational velocity 500m/s. The main research content and the achievement of this paper is as follows:Take 3-20mm thick steel plate as the basic material, Rigid, Plastic-kinematic and Johnson-cook material model was employed to simulation for Anti-penetration ability of the steel plate, Limit penetration by plate thickness are 16mm,6.3mm,6.8mm, Johnson-cook material model selected as the bullets follow-up test model; Flat bombs and round shells was employed to simulation for Anti-penetration ability of the steel plate of different thickness, penetrated by flat bombs, steel limit thickness is 6.8mm, penetrated by round shells, steel limit thickness is 7.5mm, flat bombs which destroyed large areas, round shells with strong penetration ability.Analysis the relationship between the structural design of the target plate with the protective capacity of the B4C Ceramic/metal composite plate, the simulation results show that, B4C ceramic to compound target's panel have good anti-ballistic properties. B4C ceramic/steel composite target layer interface normal stress failure of 43MPa, Shear failure stress of 25MPa, residual velocity of bullet is 22m/s; Interface normal stress failure of 86MPa, shear failure stress of 30MPa, residual velocity of bullet is Om/s, enhance interfacial strength can improve ceramic composite targets anti-penetration performance.Several kinds of B4C ceramic composite targets were simulated. B4C ceramic of 5mm thick to compound target's panel, back to take steel, aluminum and fiber board of 1-9mm thick to constrain, steel, aluminum, fiber board optimal thickness ratio are 6mm,6mm,4mm, fire backboard can play better supporting role. The confined B4C(5mm)/steel(3mm) ceramic composite targets, the basic form of ceramic cone time is 6.4μs; unconfined B4C ceramic targets, the basic form of ceramic cone time is 6.6μ.s, the confined ceramic composite targets have excellent protection ability compared to unconfined B4C ceramic targets to projectiles penetration; cover plates made of fibre has excellent anti-penetration performance under projectile impact.The results of this paper give reference to structural design of B4C ceramics compound target.