The light composite armor of SiC ceramic confined by aluminium was studied. The face,the back or the flank of ceramic were confined. The AUTODYN software was applied to study the influence of the thickness of confined layer(Al)on performance of composite armor against 12.7 mm AP. The numerical simulation results show that the confinement of SiC ceramic can increase protection performance and each kind of thickness of confined layer has a rational value. The light composite armor with higher protection performance can be obtained by optimizing the thickness of confined layer.

The effect of steel, copper and aluminum interlayer on the stress wave propagation of ceramic/ Ti6Al4V armors were studied by traditional Split Hopkinson Pressure Bar system in this paper. Based on the SHPB experimental results, the stress wave propagation mechanism and energy absorption in tri-layered structure were discussed. Compared to ceramic/Ti6Al4V structure without interlayer, the steel, copper and aluminum interlayer could attenuate the transmission stress level and greatly increase the energy absorption of the structure. Due to the high acoustic reluctance of steel and copper interlayer, the reflected shock wave was in compressed situation and extended a tri-axial compressive stress within the ceramic which could improve the anti-penetration properties of ceramic plate. The numerical modeling studies of ballistic testing were carried on, and then the energy densities were compared. The results showed the steel and copper interlayer could increase the energy absorption of ceramic and improve the anti-penetration of ceramic plate. The three kinds of interlayer structures all could attenuate transmitted energy and decrease the residual penetration.

In order to obtain the minimum areal density and optimum thickness ratio of ceramic and Ti alloy composite structure against 7.62 mm and 12.7 mm API,objective function was constituted to design the structure based on Florence model and minimum areal density criterion.Experiments were carried out to test the protection performance of composite by protection efficiency.Result indicates that the error is less than 6%,and the optimum design method can be used to guide the design of ceramic-Ti alloy composite structure.

In order to satisfy the requirements of larger deformation along the corrugation direction of flexible skin,the shape optimization of hemicycle corrugation skinning body was conducted,and a kind of corrugation shape which is superior to the hemicycle corrugation shape in longitudinal deformation capacity and transverse load carrying capacity was obtained.Finite element models for the stretching and three point bending test of this substrate and hemicycle substrate were established.Results show that the elongation of optimized body improves by 25% and the three point bending deformation of optimized skinning body reduces by 44.1%.The testing samples of optimized skinning body were prepared for tensile tests and three point bending test,and the test results coincide with the simulation results.The longitudinal tensile deformation characteristics and bending loads in transverse direction of optimal specimens are significantly increased.

This paper introduces the importance of terahertz absorbing materials and the current studies of absorption characteristics in terahertz wave of different materials,such as,polymer,carbon materials,semiconductor and metal films which are used as basic materials in terahertz absorbing materials.Furthermore,the prospects for terahertz absorbing materials are put forward.

Based on the principle that non-magnetized cold plasma has the strong reflection effect on electromagnetic waves,a new directional antenna array was designed.The directional antenna array was represented by a plurality of plasma cylinders and an omni-directional antenna.The 3D pattern of the directional antenna array obtained from simulation analysis shows that the directional antenna array has many advantages such as transmittering directional beam,quick switching direction,rapid reconstruction,radar stealth and so on.

The damage effectiveness of high-energy-beam controlled fragmentation laminated shell was determinated by static explosion.The results show that the high-energy-beam controlled fragmentation shell can effectively damage 40 mm anti-tank rocket.The 40 mm anti-tank rocket is detonated completely,meanwhile,the steel canister and steel stick can be penetrated by the controlled fragments of two-layer shells,which can better satisfy the designing requirement of shell than the three-layer shells.

Four kinds of armor steels with thickness of 1,2,2.6 and 3 mm were used as faceplates in front of ceramic/metal armors.Ballistic test was done by launching 14.5 mm armor piercing(AP) ammunition with 14.5 mm-caliber normal gun.The influence of faceplate thickness on the ballistic properties was compared.It is found that ballistic properties decrease with increasing the thickness of faceplate.When the thickness is 1 mm,the ballistic properties are the highest with the petal appearance of faceplates.When thickness is 2,2.6 or 3 mm,the appearance of faceplates is a hole with the same size as bullet diameter.At the same time,the results of numerical simulation are in accordance with that of test.

The process of 105 simulated APDSFS penetrating into titanium alloy target with different thickness was simulated using hydro-code AUTODYN.Thickness effect of titanium alloy target was given.It is found that the relation curve of protection coefficient N with thickness b of titanium alloy target is like the shape of lied "S",in which N firstly falls down then goes up,and then falls down again with b gradually increasing.It is also found that with b gradually increasing,kinetic energy(Ek) consumed by target increases linearly.

Tests of thickness effect of Ti-6Al-4V plates were conducted using 12.7 mm piercing incendiary projectiles.Steel equivalent penetration depth and protection efficiency were defined as the penetration resistance of the Ti-6Al-4V plates.The results show that the thickness effect of the Ti-6Al-4V plates has positive effect when the thickness is in the range of 10 to 30 mm.

自从坦克诞生之日起,防护能力的强弱就是衡量其主要性能的指标之一。矛与盾的较量始终是推动坦克发展的主旋律。随着对坦克装甲车辆乘员生命重视程度的不断提高,以及坦克从大规模集群作战向城市内小规模巷战的不断过渡,如何提高坦克防护能力的问题（在重量不变或者减重的要求下）也变得越来

Two kinds of high-rigidity armor steels and one armor aluminum alloy had been used as confined faceplates in front of ceramic/metal armors.Ballistic experiments were done with the 14.5 mm Armor Piercing(AP) ammunition shot by 14.5 mm-caliber ballistic gun to investigate the influence of confined faceplates on the ballistic properties of such armors.It was found that ballistic properties of armor aluminum alloy are better than those two kinds of high-rigidity armor steels when used as confined faceplates,and No.1 armor steel is little worse than No.2 armor steel.

With the 12.7 mm Armor Piercing (AP) ammunition, this paper focused on the performance of the ceramic/aluminum armors when subjected to the oblique impact at the different obliquity,and investigated the influence of effects of obliquity on the ballistic properties of such armors. DOP method was used to evaluate the ballistic properties of composite armors. It was found that effects of obliquity of ceramic composite armor was normal, namely ballistic properties increased with obliquity. When composite targets were attacked by AP, the formation of reverse conoid of ceramic in the front face of ceramic was the main reason for the improvement of ballistic properties of ceramic/aluminum composite armor.

The aim of this study was to determine contributions of fiberlayer with different thickness between front ceramic and back aluminum plate to ballistic performance of ceramic composite target impacted by 12.7 mm piercing incendiary projectiles. In those experiments, penetration depths by bullets at effective velocity were defined as the penetrating resistance of the targets and had a intercomparsion. The results showed that the protection capability reduced with the thickness of fiberlayer increasing. The reasons were also analyzed considered many aspects such as stresswave,restriction mechanism, back-force effect and so on.