Study On Anti-Penetration Property Of The Lattice Metal Ceramic Composite

In order to increase the penetration resistance of traditional laminated cermet composites,a new type of composite material consisting of lattice metal skeleton,ceramics,metal plate and epoxy resin cementing agent was designed.The anti-penetration performance of 7.62 mm steel projectiles penetrating the composite material was studied by numerical simulation.The energy absorption performance,failure mode,velocity and acceleration of the projectile of each substructure of the composite material were analyzed.The anti-penetration performance of the composite material was compared to that of the laminated cermet composite material under the same penetration conditions.By studying this paper,we can draw the following conclusions:(1)Using ANSYS/LS-DYNA software,the process of projectile penetrating three kinds of metal-ceramic composite target plates(laminated metal-ceramic composite target plate,metal honeycomb ceramic composite target plate and pyramid metal-ceramic composite target plate)is numerically simulated.The stress nephogram of projectile penetrating three kinds of composite target plate is analyzed,and the deformation and fracture of projectile-target finite element model can be generated.The failure mechanism of the target plate and the deformation of the pier thickness of the projectile are revealed;the projectile acts on the ironstone and forms micro-cracks on the surface of the ceramic.With the micro-cracks becoming thicker,longer and more,the micro-cracks gradually connect together and the ceramics break up;the lattice metal skeleton(pyramid metal skeleton and honeycomb metal skeleton)can absorb a large amount of energy from the projectile and penetrate the target plate at the same time.In the process,epoxy resin cementing agent acts together with ceramics to restrain ceramic spatter,and greatly improves the anti-penetration performance of cermet composite target plate;the velocity of projectile before penetrating the back plate has been reduced,and more importantly,the head of projectile has been thick.Compared with the face plate,the time of projectile acting on the back plate is longer,and the deformation of the back plate is larger,so the rear plate absorbs projectiles more.The energy absorbed by the panel is greater than that absorbed by the projectile.(2)The force of ceramic-metal composite target on projectile increases rapidly at first,then decreases sharply,and then rises occasionally for several periods,but the overall trend is decreasing;the force of ceramic-metal composite target on projectile decreases sharply after the breakage of ceramics,which indicates that ceramic is the main role of ceramic in the thickness of projectile pier;metal honeycomb ceramic is restored under the condition of vertical penetration.The composite target has the strongest anti-penetration performance and the laminated cermet composite target has the weakest anti-penetration performance.The anti-penetration performance of the pyramid cermet composite target is between the honeycomb cermet composite target and the laminated cermet composite target.(3)With the decrease of the penetration angle,the relative thickness of the projectile penetrating the metal-ceramic composite target increases,which reduce the residual velocity of the projectile penetrating the target and enhance the anti-penetration effect of the composite target.Compared with the veneered metal-ceramic composite target,the anti-penetration effect of the lattice metal-ceramic composite target is more sensitive to the penetration angle,which makes the lattice metal-ceramic composite target more sensitive to the penetration angle.Adding excellent anti-oblique penetration performance,but the energy absorbed by metal honeycomb ceramic composite target is larger than that of pyramid cermet composite target,indicating that metal honeycomb ceramic composite target has the strongest anti-oblique penetration performance,followed by pyramid cermet composite target,while the anti-oblique penetration performance of laminated cermet composite target is the weakest.It depends on the size of the ceramic cone.(4)By comparing the performances of conical cylindrical projectiles and flat cylindrical projectiles penetrating into metal-ceramic composite targets,it can be concluded that the performances of conical cylindrical projectiles are the strongest,while the performances of flat cylindrical projectiles are the weakest,and the performances of cylindrical projectiles are between conical cylindrical projectiles and flat cylindrical projectiles.Therefore,the hardness and strength of the panel can be improved when designing metal-ceramic composite targets,so as to achieve the performance of a pier-the penetration resistance of the composite target can be improved by using the effect.(5)In the process of projectile penetrating target plate,the role of the panel is pier thickness and restraint of ceramic crushing,while the back plate is to support ceramics and significantly improves the anti-penetration performance of composite target plate.Therefore,under the condition that the thickness of the metal plate remains unchanged,there is an optimal thickness ratio between the panel and the backplane,which make the composite target have the strongest anti-penetration performance.