Design,Preparation And Ballistic Properties Of Ceramic/UHMWPE Fiber Composites

In the 21st century,against the backdrop of peaceful development,armed conflicts and terrorist attacks still occur from time to time in local areas.As a kind of common protective equipment for individual soldiers,bulletproof insert plate can effectively protect the important parts of the body and reduce the penetration and lethal injury caused by external killing elements to the human body,so it has been attached great importance to by military institutions of various countries.To meet the needs of modern high-tech military protection,scholars at home and abroad have carried out a lot of research and made every effort to break through the limitations of bulletproof plates with single materials,heavy quality and poor mobility.At present,the composite made of ceramic panels,high-performance fiber laminates or metal materials as backplates has excellent protective properties,but it fails to achieve the integration advantage of"protective,lightweight and flexible".Therefore,under the premise of ensuring the effectiveness of ballistic protection,it is urgent to optimize the selection of materials and structural design,reduce the weight of bulletproof armor,and increase the operational mobility of individual soldiers.Relyng on the national key research and development project,we drawed on the design idea of modular composite armor to design and prepare a new bulletproof composite material with the ceramic element splinting structure as the panel and UHMWPE fiber composite material as the backplate.Based on realizing the material bendable,with the help of micro-CT scanning,ABAQUS/Explicit finite element analysis and other methods to explore the mechanical behavior of 7.62mm armor-piercing combustion bomb penetration,which provided the important theoretical basis and experimental support for damage assessment,impact resistance and structural optimization in the field of bulletproof materials.The main research contents were as following:(1)Selection of raw materials and structural design.According to the material properties,B₄C or Si C were selected as the raw materials of the ceramic layer.The influence of different ceramic unit structures on its protective performance was explored through the finite element analysis software ABAQUS,and the optimal structure of the columnar panel layer was complied.By stretching,bending,low impact and other test methods,determine the ceramic layer resin matrix type and UHMWPE backboard fiber arrangement,and finally formed the ceramic panel and UHMWPE backboard composite bulletproof material composite form.(2)Preparation of bulletproof composite materials.The high-performance structural ceramic material and the flexible resin matrix were composite to prepare semi-hard ceramic panels by casting molding method and molding method.The UD backboard was prepared by0°/90°arrangement of UHMWPE fiber.The ceramic/UHMWPE bulletproof composite was prepared by special bonding technology and molding process.(3)Ballistic performance test and damage characterization.According to GJB 4300A-2012(Level III),the bulletproof composite material was prepared for shooting test.Scanning electron microscopy(SEM)and micro-CT tomography were used to analyze the damage of composite material after ballistic penetration,and the energy dissipation mechanism of the composite plate against bullet impact was revealed.Results showed that the bullet penetration composite board damage evolution process,mainly divided into the phase response of ceramic layer"brittle fracture"and back"washing-compression"response phase,the matrix type and between panel layer of ceramic particles could be deformed little influence on the performance of composite board protection,ceramic types and penetration point location had a greater influence on the penetration resistance of the composites.The surface density of A-B composite plate prepared by B₄C material is 10.4%lower than that of A-S composite plate prepared by Si C material,and the surface density is less than 40kg/m² for light protection.(4)Finite element analysis of ballistic penetration.The finite element model of B₄C/UHMWPE fiber composite plate was established with ABAQUS/Explicit finite element analysis tool to simulate the penetration process of the composite plate against 7.62mm armour-piercing firebombs.The damage evolution and energy dissipation process were analyzed,and the accuracy of the model was verified by comparing it with the actual shooting test results.The calculation results were shown that the penetration model based on ABAQUS/Explicit finite element analysis tool was an effective model,which is helpful to predict the failure process under different working conditions.