陶瓷基复合装甲防12.7mm穿甲燃烧弹的靶试研究（Ⅱ）

基于对材料特性和防弹机理的认识,设计了由（SiC＋Si）陶瓷、616装甲钢和高强PE材料构成的陶瓷基复合靶板,靶板防护面密度为118 kg/m2,尺寸为500 mm×500 mm×25 mm。利用现役12.7 mm穿甲燃烧弹考核靶板在6发弹打击下的防护能力,检验靶板设计思路。结果表明：靶板结构是可行的,可防住V25为818 m/s的现役12.7 mm穿甲燃烧弹。     

复合材料层合板疲劳寿命形状参数与门槛值分析方法

复合材料性能具有较大的分散性,在表征复合材料疲劳寿命时,必须考虑分散性的影响。以M21C复合材料开孔层合板为研究对象,采用Sendeckyj等效静强度模型和随机变量函数的概率分布方法推导了复合材料层合板疲劳寿命形状参数和剩余强度形状参数的关系,通过试验和统计的方法获得了M21C复合材料开孔层合板的疲劳寿命形状参数和疲劳门槛值,对载荷放大系数以及低载截除水平的确定提供了数据支持。     

Bending and stress analysis of polymeric composite plates reinforced with functionally graded graphene platelets based on sinusoidal shear-deformation plate theory

The bending and stress analysis of a functionally graded polymer composite plate reinforced with gra-phene platelets are studied in this paper. The governing equations are derived by using principle of virtual work for a plate which is rested on Pasternak's foundation. Sinusoidal shear deformation theory is used to describe displacementfield. Four different distribution patterns are employed in our analysis. The analytical solution is presented for a functionally graded plate to investigate the influence of important parameters. The numerical results are presented to show the deflection and stress results of the problem for four employed patterns in terms of geometric parameters such as number of layers, weight fraction and two parameters of Pasternak's foundation.     

A comprehensive review on material selection for polymer matrix composites subjected to impact load

Polymer matrix composites (PMC) are extensively been used in many engineering applications. Various natural fibers have emerged as potential replacements to synthetic fibers as reinforcing materials composites owing to their fairly better mechanical properties, low cost, environment friendliness and biodegradability. Selection of appropriate constituents of composites for a particular application is a tedious task for a designer/engineer. Impact loading has emerged as the serious threat for the composites used in structural or secondary structural application and demands the usage of appropriate fiber and matrix combination to enhance the energy absorption and mitigate the failure. The objective of the present review is to explore the composite with various fiber and matrix combination used for impact applications, identify the gap in the literature and suggest the potential naturally available fiber and matrix combination of composites for future work in the field of impact loading. The novelty of the present study lies in exploring the combination of naturally available fiber and matrix combination which can help in better energy absorption and mitigate the failure when subjected to impact loading. In addition, the application of multi attributes decision making (MADM) tools is demonstrated for selection of fiber and matrix materials which can serve as a benchmark study for the researchers in future.     

复合土钉支护的有限元分析

复合土钉支护是从土钉墙的基础上发展起来的,它在一定程度上克服了土钉墙的缺点,是一种应用更加广泛的基坑支护新技术。通过建立有限元模型模拟了水泥土桩复合土钉墙的分步开挖与支护的过程,比较了复合土钉支护与土钉支护在土体位移、地表沉降、基底隆起及超挖引起的破坏形态的不同,研究了复合土钉支护的作用机理。结果表明:复合土钉支护能够充分调动周围土体共同作用,更加有效的控制了基坑变形,其支护效果明显优于一般的土钉支护。     

电刷镀含纳米粉复合镀层结构和磨损性能

用含纳米金刚石粉的镍镀液电刷镀复合镀层,系统试验研究了复合镀层中纳米金刚石对镀层显微结构、力学性能及耐磨性能的影响.结果表明,纳米金刚石的弥散强化作用,可有效改善镀层的生长、减小内应力,提高镀层的显微硬度.含纳米金刚石粉的复合镀层在室温、高负荷下具有优良的抗疲劳和抗磨损性能,其耐磨性是纯镍镀层的4倍.     

传感器与综合火控系统组网的协同作战能力系统

协同作战能力(CEC)系统是美国海军最早使用的与传感器和武器系统组合的网络中心战系统之一.简要介绍了CEC的发展背景,较系统地阐述了传感器组网和综合火控的概念.同时还介绍了CEC系统的配置和复合识别能力,指出CEC用作联合传感器网络基础的可能性.最后,展望了未来先进的传感器网络,并指出了在CEC中发挥网络优势必须解决的两个难题.     

高重频双波长复合干扰激光器设计

为解决基频光高重频与倍频光高平均功率之间的矛盾,设计了一台干扰用高重频双波长复合输出激光器。静态仿真了泵浦源效率、激光晶体受热和受力分布、激光高斯模式特征,得到了该激光器的复合输出特性。动态仿真调Q频率、倍频晶体长度对复合输出的影响以及分析倍频晶体热效应,发现在泵浦功率和谐振腔结构不变的前提下,需先满足基频光高重频工作,再优化倍频晶体长度和控制倍频晶体温度可提高倍频光的输出功率。按上述仿真结论开展的验证实验结果表明:当磷酸氧钛钾晶体长度为12 mm、输出镜透过率为10%、重复频率为50 k Hz时,设计的激光器基频光平均功率为18. 98 W,倍频光平均功率为2. 22 W,与仿真结论一致。     

界面改性对SiCp/Cu复合材料导热性能的影响

采用磁控溅射法结合结晶化热处理工艺在SiC颗粒表面成功制备了金属Mo涂层,分析Mo涂层的成分和形貌;采用热压烧结工艺制备SiCp/Cu复合材料,重点对比分析Mo界面阻挡层厚度对复合材料导热性能的影响。结果表明:磁控溅射法能够在SiC颗粒表面沉积得到Mo涂层,随溅射时间的延长,Mo涂层的厚度增加、粗糙度增大,且磁控溅射后SiC颗粒表面直接得到的Mo涂层为非晶态,结晶化热处理后,变为致密平整的晶态Mo涂层。磁控溅射时间对Mo涂层厚度和复合材料导热性能影响明显。随磁控溅射时间的增加,复合材料的热导率呈先增后减趋势。采用磁控溅射9h镀Mo改性并经过800℃结晶化热处理的SiC复合粉体在850℃下热压烧结制备的SiCp/Cu复合材料(VSiC=50%),其热导率达到了最高值274.056W/(m·K)。     

船海复合场景面元化快速电磁建模方法及SAR成像仿真

在微波高频段,海面背景或海上船类目标往往具有电大尺寸和复杂精细的结构,这给船海复合场景的电磁建模带来巨大的计算负担。为简化计算,基于海面电磁散射模型面元化思想和图形电磁学,结合计算耦合场的四路径模型,提出一种电大尺寸船海复合场景电磁散射的快速计算方法。在保证海面与目标复合散射场的计算准确性前提下,提高计算效率。仿真并分析不同雷达参数下动态海面与目标的雷达散射截面,计算结果与实测数据以及精确数值方法结果的良好一致性验证了方法的准确性。将复合散射快速计算方法应用于合成孔径雷达成像仿真,仿真结果验证了方法的有效性。