Study On Impact Resistance Of Fiber Metal Laminated Structures

Lightweight materials are widely used in modern protective structures.Compared with steel structures,lightweight materials can effectively protect against ballistic impacts,explosions and other impact events at a relatively lighter weight.There are many researches on the protective performance of a single material structure,while the research on the protective performance of a laminated structure composed of different materials is sparse.At present,the main research is concentrated on FMLs.However,the protective performance of laminated structures of different materials is affected by many factors.Studies show that laminated structures generally have better protective performance than single material structures.In this paper,the failure mode and impact resistance of carbon fiber 2024-T3 aluminum alloy laminated target plate under high speed impact are studied by ballistic impact test and numerical simulation.In the high-speed impact test,a number of high-speed impact experiments were carried out on Al +CFRP,CFRP+ Al and CFRP+CFRP targets with blunt and Ogival projectiles impacting.The effects of the lamination sequence of aluminum alloy and carbon fiber laminates and the difference of the shape of the projectile on the resistance of the laminated target plates were studied.Later,the numerical simulation software Abaqus was used to perform numerical simulations on some test conditions,and then extended research based on this model.First,when the total thickness is the same,laminated structure that composed of different thicknesses of carbon fiber and aluminum alloy was impacted by the blunt projectile and the damage behavior has carried on the simulation analysis,The influence of the thickness of aluminum alloy/carbon fiber on the protective performance of the laminated target plate is obtained..Numerical simulations of blunt projectiles impacting the AL+CFRP laminate structure at different impact angles had been carried out.The results show that the increase of the inclination angle change the damage mode of the target plate,which in turn leads to the different ballistic limits of the target plate under impact with different inclination angles.