Research On The Design Of Lightweight Ceramic Fiber Composite Bulletproof Structure

To meet the needs of modern war’s rapid attack and battlefield survivability,military aircraft need to be more protective,maneuverable and flexible.This put forward higher lightweight requirements for armor protection.On the basis of ensuring the protection performance of the original armor,the weight of the protective armor was reduced.On the basis of the research on the anti-bullet mechanism of ceramic composite armor,the scheme of abnormal ceramic structure and overall coating structure was put forward.The lightweight ceramic composite armor was analyzed and designed by means of numerical simulation and experimental verification in order to meet the design requirements of lightweight armor.To resist the protection requirements of 12.7mm armor piercing incendiary projectile,the three-dimensional structure of B4C ceramic / UHMWPE / Kevlar was designed.First of all,the evaluation method and design principle of armor protection are introduced by referring to the anti-ballistic level classified by American army standard.The mechanical properties and mechanism of the commonly used anti-ballistic ceramics and fibers were compared.In this paper,the relationship between the elastic constants of the composite cell and the whole cell was deduced,and a calculation method of the elastic constants of the composite cell was proposed,which was verified by numerical calculation.Secondly,by analyzing the effect of the optimal warhead shape on the penetration process,abnormal ceramic structure was proposed.LS-DYNA was used to simulate the penetration of projectile into abnormal ceramic/ aluminum alloy.The simulation results showed that the abnormal structure can improve the protective performance of the target plate,and the structure size of the experimental ceramic was determined.In order to improve the supporting stiffness of the back plate and share the impact force of the projectile,a fiber coating structure was proposed.Finally,based on the abnormal ceramic structure,a comparative penetration test was designed.The results show that the fiber coating structure can reduce the problem of cracking and separation;the abnormal ceramic structure can aggravate the deformation of warhead and increase the area of ceramic damage in the early stage of penetration;the carbon fiber laminate is more suitable for the back plate material of target plate than the aluminum alloy or titanium alloy / carbon fiber laminate with equal area density;the carbon fiber laminate was damaged in the form of shear fracture and delamination;impact When the point is close to the edge of the target plate,the protection performance is reduced.The correctness of the theory of heteromorphic ceramic structure and coating structure is verified by experiments.According to the numerical simulation and test results of the abnormal ceramic structure,the abnormal coefficient was proposed.