Design And Anti-Penetration Behavior Of Columnar Ceramic/Interlayer Hybrid Fiber Composites

In recent years,the international situation has been turbulent,with border conflicts,geopolitical wars,and terrorism constantly occurring.To cope with this complex and everchanging international situation,China must ensure that it has sufficient defense strength to deal with the threat of international hegemonism.As an important piece of equipment to ensure the survival rate of soldiers on the battlefield and maintain the combat effectiveness of the army system,individual body armor has always been widely concerned by all countries,and China’s demand for high-performance bulletproof composites is also expanding.High-performance bulletproof composites usually needs to balance performance requirements such as light weight,durability,high bullet resistance level,and high environmental adaptability.In particular,the contradiction of lightweight and high strength has become the focus of research for scientific researchers in the field of anti-bullet and the difficulty of product development.To solve the research and development problem of light-weight and high-strength in highperformance individual body armor and provide new design and development ideas for highperformance individual body armor,this project carried out the structural design and preparation of a type of columnar ceramic/interlayer hybrid fiber composites,relying on national key research and development project and enterprise research and development project.Through using numerical simulation,Micro-CT,and other analysis methods,we studied its antipenetration behavior,so as to provide a theoretical and empirical reference for research and product development in the field of anti-bullet.The main research contents of this project are as follows:(1)Parametric simulation design of ceramic panel structure of columnar ceramic/interlayer hybrid fiber composites.We constructed the coupling equation of the structural parameters of the columnar ceramic panel,used the numerical simulation method of SPH-FE coupling to parametrically study the ceramic structure,and obtained the relationship between the ceramic structure parameters and ceramic plate’s protection ability.The results show that the anti-penetration behavior of ceramic panels has obvious size effects,shape effects,and spatial position effects.The weak point of the ceramic panel’s bulletproof ability is transferred from the gap of the three ceramic splices to the center of a single ceramic with the decrease of the cylinder radii and the arc radii of the ceramic.Based on the comprehensive evaluation of the penetration depth of post effect steel plate and energy absorption rate,the ceramic structure with the best penetration resistance was selected.(2)Structural design and simulation prediction of the anti-penetration behavior of high-performance fiber backplate of columnar ceramic/interlayer hybrid fiber composites.Four hybrid structures of Kevlar/UHMWPE composite panels were designed.by using the Vumat subprogram,a constitutive model containing the strain rate effect of fiber was constructed.The penetration damage process of columnar ceramic/interlayer hybrid fiber composites against 7.62 mm 53 type armor-piercing incendiary projectile was simulated and predicted by the SPH-FE method,revealing the damage failure and energy absorption mechanism of composites.The results show that the anti-penetration behavior of composites can be divided into four stages: ceramic crush and abrasive bullet to absorb energy;fiber of backplate shear failure and fiber tensile to absorb energy;fiber tensile failure and backplate delaminate to absorb energy;backplate delaminate to absorb energy.The first stage,the second stage and the third stage can effectively absorb bullet energy and act as bulletproof.The transition from the second stage to the third stage is marked by the beginning of obvious delamination in the middle of the backplane.The backplate’s hybrid structure can effectively improve the penetration resistance of composites.(3)Ballistic performance test and characterization of columnar ceramic/interlayer hybrid fiber composites.Four kinds of columnar ceramic/interlayer hybrid fiber composites target plates were prepared by pouring method and hot pressing method.Through 7.62 mm armor-piercing incendiary ballistic penetration experiment and Micro-CT technology,the ballistic performance of composites was verified and characterized and the main damage process and energy dissipation mechanism of composites were inferred.The results show that the hybrid structure in the fiber backplate can effectively improve the resistance of composites to single and multiple bullets.Compared with UHMWPE composites,the hole volume ratio of interlayer hybrid fiber composites after penetration was reduced by 57%,and the backface signatures were reduced by 3-5 mm.Columnar ceramic/interlayer hybrid fiber composites with K/U/K structure on the backplate could stop bullets from penetrating composites.By comparing the numerical simulation results and the experimental results,the reliability of the prediction results of the numerical simulation model was verified,and the error between the numerical simulation prediction results and the actual test results did not exceed 10%.