研究爆炸冲击波在厚度较小的缓冲介质中的衰减规律对活性破片战斗部缓冲结构的设计具有重要意义.基于冲击波在介质中的传播理论,计算爆炸冲击波在不同缓冲结构中的衰减特性,得到常见战斗部装药内衬材料铝、钢和低阻抗缓冲材料聚氨酯的组合结构在总厚度为5、10、20 mm时对冲击波传播的影响规律;并利用爆炸加载测试系统对计算结果进行试验验证.结果表明:在总厚度约为20 mm,PTFE基活性破片战斗部使用钢、聚氨酯组合结构对冲击波压力的衰减效果要优于铝、聚氨酯缓冲结构.研究结果对活性破片战斗部用缓冲结构设计具有参考价值.

为从理论方面探索增强颗粒准连续网状分布对复合材料力学性能的影响,对增强颗粒准连续网状分布与随机分布的复合结构进行有限元建模,对其弹性模量和强度进行模拟分析,得到不同颗粒含量下,网状分布和随机分布的复合材料力学性能数据.结果 表明:增强颗粒网状分布时,复合材料的弹性模量和强度比随机分布时高,且随增强体含量增多,差异更明显.

通过建立代表复合材料细观结构的体积单元(代表体元),模拟该单元在一定载荷和边界条件下的力学行为,可以分析材料宏观力学性能与材料组织结构间的定量关系.在构建代表体元模型时一般有两类方法:一是基于复合材料局部真实结构的真实结构模型法,二是基于复合材料结构的典型特征模拟出复合材料结构的虚拟结构模型法.其中虚拟结构模型法因简单高效,研究和使用较多.对两类建模方法进行较详细的介绍,并对其优缺点和应用场景进行简要分析.

为使模拟弹爆炸驱动后形成大小均匀、飞散合理的破片群,对模拟弹弹体采用预制破片技术.利用LS-DYNA有限元计算程序和破片初速经验理论公式,得到破片飞散的初速、破片沿着轴向的速度分布和破片向前、向后的飞散角度,并设计模拟弹进行靶场试验验证.结果表明:数值模拟结臬与试验结果近似一致,且采用预制破片技术对弹体改性后形成的破片较均匀.

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.

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.

According to the structure characteristics of military airport runway,using the surface scattering advantage of anti?runway shrapnel,at the precondition of bullet detecting the military airport runway,a new method of calculating the damage probability of anti?runway shrapnel was presented. The hitting probability for airport runway was calculated by SLAM method. Compared to Monte?Carlo method,SLAM method has the advantages of short time consuming and high precision,which is of important reference value in system design and efficiency analysis.

通过建立考虑侵蚀燃烧效应的固体火箭发动机内弹道模型,计算发动机内弹道压力时间曲线,将此压力数据作为初始压力输入值,利用FLUENT仿真软件对带有平直段的喷管内的流场进行仿真计算,确定喷管是否实现超音速流场。最后进行小型旋转固体火箭发动机静态和动态性能测试,测试结果表明,发动机转速达到19 000r/min,满足工作需要。

为提高爆炸成型弹丸对目标的定向毁伤效果,设计了一种基于VESF起爆系统的多爆炸成型弹丸装药结构,采用LS-DYNA软件对VESF起爆系统产生的平面波和起爆方式对多爆炸成型弹丸装药威力的影响进行了仿真计算,并通过靶场实验进行了验证.结果表明:采用VESF起爆系统的多爆炸成型弹丸装药产生的爆炸成型弹丸速度较高,可实现多个爆炸成型弹丸的高定向度飞散,并可引爆长径比很大的炸药装药.

According to the special requirement of anti-runway ammunition and energy conservation principle, a shaped charge with arc liner was designed, which can perforate a runway target and make a hole with large diameter on it. The influence of the liner structure parameters on the feature of projectile formed by arc liner was analyzed by numerical simulation. The penetration performances of different projectiles to runway target were calculated. The effect of liner wall thickness on the damage performance was discussed. The simulation results were validated by experiment. The numerical simulation and experimental results show that the shaped charge with arc liner can satisfy the application requirements of anti-runway tandem warhead.

A kind of charge structure for multiple explosive formed projectile was put forward to improve the destruction effect on the targets. Firstly, the shape, material, obliquity and velocity of flying debris, and the distance between flying debris and primary charge were confirmed by theoretical analysis and calculation, then designing structure of MEFP charge was validated. The test results show that the VESF initiation system is capable to initiate the main charge, adjust the shape of blast wave in the main charge, and realize the high orientation of explosive formed projectile.

Abstract ¾ The course of simulation is establishing mathematics model of exterior ballistics、creating simulation platform using SIMULINK and establishing 3D visual scene using VRML（Virtual Reality Modeling Language）and V-Realm Build 2.0. The input signal can be accepted by output module of VR Sink, because of the technology of combination of SIMULINK and VRML. It can display the movement of rocket in the way of virtual reality. The flight trajectory reflects the flight state of rocket. The technology of Virtual Reality is significant for designers to design exterior ballistics of rocket.

Putting forward the straight-line trajectory of MEFP （multi-explosively formed penetrators, also called attack unit） in the target coordinate by means of building ground coordinate and target coordinate and the conversion of ground coordinate to target coordinate in the Area Blank off Weapon System. According to the intersection criterion that there are only two points between the attack unit straight-line trajectory and the cylindrical surface of the target, whether attack unit hits the target or not is decided. The intersection criterion is applied on the simulation of all kinds of different distributed plans.

In order to adjust shape of blast wave in charge,the flyer impacting initiating system was designed.Firstly,shape and material of flyer,flyer obliquity,distance between flyer and primary charge were confirmed by theoretical analysis and calculation;Finally,flyer impacting initiating system was studied by numerical simulation.The results show that the flyer impacting initiating system is easy to initiate charge and adjust shape of blast wave in charge,also can provide reference for driving power of pre-fragment or MEFP at the end warhead.

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.

In order to form plane shock wave in explosive charge after detonation,a flying-plate initiating system was put forward. The principle of material selection, the shape and incline angle of flying-plate were defined by theoretical analysis and calculations. The velocity of flying-plate, distance of between flying-plate and driving charge was analyzed and calculated according one-dimensional driving theory. The working process of flying-plate initiating system was studied by numerical simulation and the simulation results show flying-plate initiating system is reliable way to initiate main charge and form good plane wave.

When the axis of the projectile and the axis of the tandem warhead do not coincide with each other, the effects of the detonation field of the precursory charge in the tandem warhead on the following velocity and attitude of the projectile the composition of warhead, were numerically simulated with the finite element code LS-DYNA3D. For the projectiles with different initial velocities, their backward jettison, yawing, attitude turnover and dynamics response under the field were studied. It can be found that, if the projectile has an initial velocity, the yawing and the attitude turnover can be reduced greatly, but the influences of the initial velocity on the backward jettison and dynamics response are weak. The conclusions are helpful for the engineering design of tandem warhead.

When the axis of the projectile and the axis of the tandem warhead do not coincide with each other,the effects of the detonation field of the precursory charge in the tandem warhead on the following velocity and attitude of the projectile the composition of warhead,were numerically simulated with the finite element code LS-DYNA3D.For the projectiles with different initial velocities,their backward jettison,yawing,attitude turnover and dynamics response under the field were studied.It can be found that,if the projectile has an initial velocity,the yawing and the attitude turnover can be reduced greatly,but the influences of the initial velocity on the backward jettison and dynamics response are weak.The conclusions are helpful for the engineering design of tandem warhead.

Base on the ballistics characteristic the dynamics model of parachute-bomb system is predigested and the ballistic fall point spread model is built up.The influence factor on the ballistic fall point spread of the parachute-bomb is studied and the result is contrasted.And the sensitive factor is pointed out.The conclusion believes that the angle spread of the plane,set machine angle,the spread of the separation velocity,umbrella and the wind spread are the obvious factor on the ballistic fall point spread.