关键词: SiC/UHMWPE复合装甲, 数值模拟, 粘结性能, 弹道性能, 复合材料分层

Abstract: Research on ceramic/fiber-reinforced composite armor has become an important direction of current research and application, and UHMWPE fiber-reinforced composites have been widely studied and applied in the field of armor protection due to their low density, high strength and excellent impact resistance. However, there are few systematic research reports on the effects of interface bonding between the plies of composite backplates on the on the ballistic protection performance of the composite armor. We take SiC/UHMWPE composite armor as the research object and use the numerical simulation analysis method to analyze and study the influence of the interface bonding of the composite backplate on the ballistic protection performance of the composite armor.
Based on numerical FEM simulation analysis, Tiebreak contact was used to simulate the effects of interface bonding behavior of the UHMWPE composite backplate, and the ballistic penetration model of SiC/UHMWPE composite armor against 7.62 mm armor-piercing incendiary projectiles was established. The feasibility of the numerical simulation analysis method was proved by comparing a large number of test result data with the numerical simulation result data. On this basis, the above-mentioned numerical models were solved by using the explicit dynamic finite element analysis program LS-DYNA, the numerical simulation results were extracted by the post-processing software LS-PREPOST, and the effects of the interface bonding properties of the composite material backplate in SiC/UHMWPE composite armor on composite armor ballistic performance, ballistic limit velocity, energy absorption, and damage modes were analyzed and discussed. The research results show that with the improvement of bonding performance, the ballistic limit velocity of the SiC/UHMWPE composite armor decreases, the backface signature decreases and the time required for the projectile to stop is shortened when the composite armor is not penetrated by the projectile; the delamination is more pronounced, more composite materials are deformed and damaged in the tensile mode, and more kinetic energy of the projectile is absorbed.
In the SiC/UHMWPE composite armor, the relationship between the interface bonding behavior of the composite backplate and the ballistic performance of the composite armor further reveals the importance of the interface bonding of the composite backplate for the composite armor. The results of this paper can provide  reference for the design, material selection and numerical simulation of composite armor with fiber-reinforced composites as the backplate.

Key words: SiC/UHMWPE composite armor, numerical simulation, cohesive property, ballistic performance, delamination of composite materials