4层横向运动板防护长细杆的数值分析

多层横向运动板对垂直来侵长细杆的挤压、剪切能够使长细杆发生挤压和剪切变形,进而降低长细杆后续的侵彻能力,增强装甲的防护效果。利用LS—DYNA软件对多层横向、邻层反向运动的钢装甲板防护钨合金长细杆进行运动板速度和运动板的厚度分配的相关仿真计算。通过对计算结果中开坑形状、后效板侵深和装甲效能进行分析发现,随着板运动速度的增加,后效板开坑深度减小和开坑形状的非对称性加剧,运动板的干扰作用增强及防护效能提高;在运动板总厚度相同的情况下,板的层数越少,防护性能越好。     

方孔蜂窝夹层板在爆炸载荷下的动态响应

通过有限元数值模拟方法,对方孔蜂窝夹层板在爆炸冲击载荷下的动态响应和变形机理进行了分析.在单位面积质量以及夹芯层的高度、宽度给定的情况下,得出了最优的夹芯层相对密度.在此相对密度下,夹层板吸收能量最多,下面板变形最小,夹层板的抗冲击性能最优.将单位面积质量相等的夹层板和实体板进行了对比分析,结果表明:夹层板具有更加优良...     

靶板标准化研究

本文简要介绍了国内靶板的采标情况,并对国外靶板标准情况进行了浅析,提出了我国武器装备及其弹药科研、生产和试验用靶板的标准化建议,对靶板标准体系建设具有一定的指导意义,可为今后靶板标准的立项提供参考。     

曲面蜂窝板的弯曲特性仿真分析研究

蜂窝夹芯板是一种已经广泛应用于航空航天领域的复合材料结构。目前针对蜂窝夹芯板的研究多简化为平面蜂窝板问题的研究,然而在实际使用中大多数蜂窝板都是曲面结构。建立了圆柱形曲面蜂窝板的蜂窝节点坐标方程,并计算出了一段圆柱形曲面蜂窝板的节点坐标,之后利用ANSYS的APDL语言编程建立了该曲面蜂窝板三维模型,并针对曲面蜂窝板的两种典型受力情况进行仿真,获得了在这两种受力情况下曲面蜂窝板的力学行为。同时,还通过仿真分析研究了曲面蜂窝板变形量与其承载能力之间的关系,得到了曲面蜂窝板整体承载能力与蜂窝是否损坏的关系。     

考虑表层抗弯刚度影响的夹层板静力学等效分析

基于Hoff型夹层板理论,推导了夹层板广义的应力-应变关系式,得到了等效板的弹性常数,从而建立了考虑表层抗弯刚度的夹层板静力学等效模型.通过理论分析和计算,研究了夹层板的参数对这种等效精度的影响,并给出了这种等效分析方法的适用范围.研究表明,利用等效分析方法对Hoff型夹层板进行静力分析可在一定范围内可达到满意的精度.     

激光辐照下45#钢板响应特性

采取实验和数值模拟相结合的方法对激光辐照45#钢板的响应特性进行研究。基于连续光纤激光发射系统,开展钢板的激光辐照实验,得到温度场分布及靶板的烧蚀穿孔特性;基于ANSYS建立靶板有限元模型,模拟激光辐照下靶板的热响应过程,得到了靶板厚度、激光功率和光斑直径等因素对靶板温度分布及靶板穿孔特性的影响规律。     

连接方式对舰船舷侧复合装甲结构抗穿甲性能的影响

为探讨连接方式对舰船舷侧外设复合装甲结构抗穿甲性能的影响,采用均质钢板粘结或叠层接触前置复合材料板分别模拟舰船舷侧粘敷或铆接固定两种连接方式的外设舷侧复合装甲,并结合低速弹道实验,分析了两种连接方式下组合靶板的穿甲破坏模式和抗弹性能,得到了球头弹穿透叠层接触组合靶板的剩余速度理论预测公式。在此基础上,将该理论预测公式计算结果与实验结果进行了比较分析。结果表明:两种组合靶板中前置装甲板的穿甲破坏模式差异不大,但叠层接触组合靶板中钢质背板穿孔周围的蝶形变形范围及其变形程度均较粘结组合靶板中的钢质背板要大;叠层接触组合靶板的整体抗弹吸能要大于粘结组合靶板;弹丸穿透叠层接触组合靶板的剩余速度理论预测值与实验结果吻合较好。     

利用点源函数求解圆板在非中心对称载荷作用下的弯曲问题

本文将作用在圆板任意位置的一个垂直于板平面的单位集中力看作一个点源,用δ—函数表示,求出相应的板弯曲四阶偏微分方程的解。将这个解看作点源函数,它相当于解二阶偏微分方程中的Green函数,由迭加原理得到圆板在任意横向载荷(关于板中心对称及非对称的载荷)作用下的解。     

国内外装甲挂胶履带板发展现状探析

<正>在研制履带使它现代化的过程中,提高履带板的功能特性应该与它的高可靠性、长的使用寿命和减小它们的相对尺寸-质量指标结合起来。本文介绍了国内及国外履带板挂胶的经典结构,提出履带板挂胶结构发展前景,通过对各国履带板挂胶技术进行总结分析,归纳提炼出适应我军应用的履带板挂胶技术。履带板是履带的主要组件,由于它的重量分布在大的支承面上,所以履带板的功用是保证车辆在松软地面上的通过性,降低行驶阻力     

二维抛板极限速度的相似性与古尼公式的采用

本文分析影响被炸药驱动下抛板极限速度的重要因素,讨论了一些经验公式的适用范围;提出了根据二维抛板的数值计算得到的两个重要规律:①在炸药与抛板的质量比相同的情况下,抛板的极限速度之间具有一定的相似关系;②修正的古尼公式可用来计算二维抛板的极限速度。     

Chain damage effects of multi-spaced plates by reactive jet impact

Chain damage is a new phenomenon that occurs when a reactive jet impacts and penetrates multi-spaced plates.The reactive jet produces mechanical perforations on the spaced plates by its kinetic energy(KE),and then results in unusual chain rupturing effects and excessive structural damage on the spaced plates by its deflagration reaction.In the present study,the chain damage behavior is initially demonstrated by experiments.The reactive liners,composed of 26 wt％Al and 74 wt％PTFE,are fabricated through a pressing and sintering process.Three reactive liner thicknesses of 0.08 CD,0.10 CD and 0.12 CD(charge diameter)are chosen to carry out the chain damage experiments.The results show a chain rupturing phenomenon caused by reactive jet.The constant reaction delay time and the different penetration velocities of reactive jets from liners with different thicknesses result in the variation of the deflagration position,which consequently determines the number of ruptured plates behind the armor.Then,the finite-element code AUTODYN-3D has been used to simulate the kinetic energy only-induced rupturing effects on plates,based on the mechanism of behind armor debris(BAD).The significant discrepancies between simulations and experiments indicate that one enhanced damage mechanism,the behind armor blast(BAB),has acted on the ruptured plates.Finally,a theoretical model is used to consider the BAB-induced enhancement,and the analysis shows that the rupturing area on aluminum plates depends strongly upon the KE only-induced pre-perforations,the mass of reactive materials,and the thickness of plates.     

面内阶跃载荷下薄板弹性动力屈曲差分解

根据薄板微元的动力平衡分析导出薄板动力屈曲控制方程,由屈曲瞬间能量转换率守恒条件得出一个压缩波前屈曲变形的附加约束方程,由此得到求解薄板动力屈曲问题的完备定解条件.以受载边夹支的薄板为倒,利用有限差分法得出了薄板前三阶动力屈曲模态和相应的两个特征参数值,并对比分析了薄板静、动力屈曲的差别.分析表明,薄板动力屈曲过程中产生屈曲动能,比静力屈曲要吸收更多的外部能量.     

不同初速弹丸对靶板的损伤仿真与评估

为了研究弹丸对武器装备的损伤,建立弹丸侵彻多层靶板的有限元模型,对不同初速弹丸侵彻多层靶板进行仿真试验,引入等效应变及等效应力参量以精确描述靶板损伤,提出一种基于多元统计分析对靶板损伤进行评估的方法。结果表明：利用该方法所得到的计算结果与理论分析结果完全一致。这说明基于多元统计分析的靶板损伤评估方法能够正确地评价仿真实验中目标靶板的战损程度,因而可以进一步应用于装备侵彻损伤评估与易损性研究中。     

Multi-layer protective armour for underwater shock wave mitigation

The effect of underwater shock wave on different target plates has been studied.An underwater shock wave generator(shock tube) was used to study the interactions between water and different constructed targets which act as shock wave mitigation.Target plates,composed of sandwich of two aluminum sheets with rubber and foam in between,were prepared and studied.For comparison,the target plates composed of triple aluminum sheets were tested.The study includes the testing of the selected plates in water under the effect of different peak pressures and the analysis of the results.The strain gauge data and displacement sensors results showed that the multi-layer plates have higher level of underwater shock wave mitigation than the triple aluminum plates with strain and deflection of nearly 50%.     

不同密度弹丸对靶板的损伤仿真与评估研究

为研究不同密度弹丸对武器装备的损伤，建立弹丸侵彻多层靶板的有限元模型，对不同密度弹丸侵彻多层靶板进行仿真试验。不同于传统的宏观破口尺寸损伤表征参数，引入等效应变及等效应力幅值来精确描述靶板损伤，并提出了一种基于多元统计分析对靶板损伤进行评估的方法。计算结果表明：利用该方法所得到的评估结果与理论分析结果完全一致。这说明基于多元统计分析的靶板损伤评估方法是切实可行的，可以进一步应用于装备损伤评估与易损性研究中。     

Damage of multi-layer spaced metallic target plates impacted by radial layered PELE

Three different kinds of PELE (the penetrator with lateral efficiency) were launched by ballistic artillery to impact the multi-layer spaced metal target plates. The impact velocities of the projectiles were measured by the velocity measuring system. The damage degree and process of each layer of target plate impacted by the three kinds of projectiles were analyzed. The experimental results show that all the three kinds of projectiles have the effect of expanding holes on the multi-layer spaced metal target plates. For the normal structure PELE(without layered) with tungsten alloy jacket and the radial layered PELE with tungsten alloy jacket, the diameters of holes on the second layer of plates are 3.36 times and 3.76 times of the diameter of the projectile, respectively. For radial layered PELE with W/Zr-based amorphous composite jacket, due to the large number of tungsten wires dispersed after the impact, the diameter of the holes on the four-layer spaced plates can reach 2.4 times, 3.04 times, 5.36 times and 2.68 times of the diameter of the projectile. Besides, the normal structure PELE with tungsten alloy jacket and the radial layered PELE whit tungsten alloy jacket formed a large number of fragments impact marks on the third target plate. Although the number of fragments penetrating the third target plate is not as large as that of the normal structure PELE, the area of dispersion of fragments impact craters on the third target plate is larger by the radial layered PELE. The radial layered PELE with W/Zr-based amorphous composite jacket released a lot of heat energy due to the impact of the matrix material, and formed a large area of ablation marks on the last three target plates.     

爆炸冲击波对靶板的损伤仿真与评估研究

为了研究爆炸冲击波对武器装备的损伤，建立了炸药爆炸冲击靶板的有限元模型，对不同厚度靶板在确定爆炸冲击环境下的损伤进行了仿真试验。不同于传统的宏观破口尺寸损伤表征参数，引入了等效塑性应变来精确描述靶板损伤，并提出了一种基于主成分分析理论对靶板损伤进行评估的方法。结果表明：利用该方法所得到的计算结果与理论分析结果完全一致。这说明基于多元统计分析的靶板损伤评估方法是切实可行的，可以进一步应用于装备爆炸损伤评估与易损性研究中。     

横向运动板对长杆弹变形及运动影响的数值研究

利用Ls—DYNA软件对钨合金长杆弹垂直侵彻单层和双层横向运动钢板进行了数值计算。通过分析长杆弹的塑性变形、速度降、动能降和横向速度，得到了单层和双层板横向运动速度与影响长杆弹侵彻能力因素的关系。仿真结果表明：随着运动板速度的增加，运动板对长杆弹的侵蚀加剧，长杆弹的速度降、动能降增大；运动板相同速度下，虽然单层板的冲击能使长杆弹获得较大横向速度，但双层板比单层板对长杆弹的干扰效果更明显。