Study On Numerical Simulation Of Ballistic Damage Mechanisms Of Laminated Composites

In order to meet the needs of the modern warfare, armor weight must be reduced as far as possible on the basis of excellent barrier property. Laminated armor are made of the optimized structure of excellent protective performance material and bonded by adhesive. A lightweight laminated composite with the ability of anti multiple projectile hit was designed and prepared in this thesis, also known as laminated armor. The ballistic mechanism and the process penetrated by 12.7mm armor piercing incendiary(API) of laminated armor were study by experimental and numerical simulation. The main research contents are as follows:(1) Based on the understanding of ceramic, metal and high performance fiber reinforced composites characteristics, two laminated armors composed of alumina ceramic, TC4 titanium alloy and ultra high molecular weight polyethylene(UHMWPE) were prepared in this thesis. Their areal density are 8.75g/cm2 and 9.575g/cm2 respectively, and they have a significantly reduce compared with the traditional metal or ceramic/metal armor.(2) According to GJB 59.18-1988, the armors were tested by 12.7mm API. This thesis analyzed the crushing energy dissipation mechanism of ceramic cylinder, the ballistic energy absorption mechanism of UHMWPE and the adiabatic shear plugging mechanism of TC4 based on the damage pattern of each layer materials. The protection level of armor was judged according to the damage degree of the TC4 backplane layer.(3) Three different penetration processes, which are when the projectile impact on a cylinder ceramic, two cylinder ceramic and three cylinder ceramic, were simulated by the finite element software, and the results show that the simulation were well agreement with experiments on the damage characteristic of each layer material. The simulation results show that the armor had almost the same protection performance no matter what the position of projectile impact, so the laminated armor designed in this thesis solve the protection blind area of ceramic plate armor.