首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
本文慨述了含能材料对提高武器系统性能的重大作用以及含能材料合成研究的主要目标。含能材料合成的主要研究领域包括:(1)多硝基芳香族化合物;(2)多硝基脂肪族化合物;(3)多硝基含氟化合物;(4)多硝基氟杂环化合物;(5)多硝基多环笼形化合物;(6)叠氮有机化合物。本文还分别介绍了近年来含能材料合成研究在这些研究领域中的最新进展。  相似文献   

2.
对爆炸加工产生的历史背景做了简单的回顾,对研制和应用现状作了简单的介绍。并对今后的发展方向,尤其是在新材料合成方面的重要作用做了简单的分析。  相似文献   

3.
含能材料密实床燃烧转爆轰的数值模拟   总被引:2,自引:0,他引:2  
姜羲  王荪源 《爆炸与冲击》1992,12(2):97-105
本文建立了含能材料密实床燃烧转爆轰的全粘性欧拉二维非定常两相反应流数学模型。将SIMPLE型的数值计算方法引入燃烧转爆轰的二维数值计算。对跨音速流动的处理和可压缩流体压力校正方程的建立提出了改进方法,并以无起爆药雷管作为算例。结果表明,本方法较好克服了二维两相流数值解的振荡现象。  相似文献   

4.
综述了人工合成超硬材料技术的发展,报导了用炸药爆炸及冲击波高压合成金刚石及纤锌矿型氮化硼两种硬材料的技术与结果,并简介了其应用情况。  相似文献   

5.
为了研究由含能材料制备的药型罩爆炸成型过程及其对目标靶的终点效应,设计了球缺形药型罩的装药结构,放置与药型罩曲率相同的缓冲垫在药型罩和主装药之间,运用高速摄影系统拍摄含能材料药型罩的成型过程。实验结果表明,含能材料药型罩在爆炸作用下能够形成弹丸,弹丸速度2km/s左右。含能弹丸穿透20mm厚的装甲钢靶后反应加剧,形成大量的气体。侵彻过程含动能和化学反应的综合作用,穿孔有明显的烧蚀现象,穿孔口径0.5 D,最大穿深1.4 D。利用含能材料制备成药型罩可以实现炸药的直接驱动,这可为含能材料战斗部的工程应用提供参考。  相似文献   

6.
简述了巴西实验的基本原理及发展概况,着重介绍了含能材料的巴西实验研究现状,讨论了今后开展含能材料细观响应规律研究的巴西实验方法。  相似文献   

7.
在含能材料单轴、受限三轴动态压缩实验的基础上,提出一种将计算机数值模拟和实验数据相结合,估算实验系统中钢筒与试件间的库伦摩擦力,从而正确确定含能材料的动态三轴力学性能(弹性模量E,泊桑比ν,屈服限Y等)的方法。本方法用于TNT炸药受限三轴动态压缩实验,通过建立钢筒-试件的库伦摩擦有限元模型,采用ADINA通用程序进行动力分析,估算了摩擦力对实验数据的影响,获得了考虑摩擦力修正后的TNT三轴动态压缩响应,为含能材料三轴动态力学性能的确定提供了一种有效的方法。  相似文献   

8.
着重介绍了自蔓延高温合成技术的国内外发展现状、工艺特点、基础理论、燃烧模式、燃烧机理以及实际应用领域,并进行了分析。  相似文献   

9.
含能材料装药的损伤及力学性能研究进展   总被引:15,自引:0,他引:15  
陈鹏万  丁雁生  陈力 《力学进展》2002,32(2):212-222
研究含能材料的损伤和力学性能对于指导含能材料配方和结 构件设计,以及对含能材料进行安全性评估和寿命预测等都具有重 要的意义.损伤一方面使含能材料的力学性能劣化,另一方面还影响 含能材料的感度、燃烧甚至爆炸性能.本文对含能材料损伤和力学性 能的研究现状进行了综述和归纳.对含能材料损伤的产生、实验模拟、 主要损伤模式,损伤对含能材料的感度和燃烧性能等的影响,炸药 单相材料的性质,影响含能材料力学性能的因素以及损伤本构关系 等进行了介绍.对其中的一些关键问题和热点问题进行了分析,并对 今后需要开展的工作发表了一些看法.  相似文献   

10.
采用自制的含能材料动态变温压缩实验装置,在低温环境下,对国产复合炸药Comp.B和单质炸药TNT进行了动静态压缩实验,测试了压缩模量、压缩强度等材料性能参数。实验结果表明:在低温条件下,Comp,B和TNT材料具有明显的应变率效应和温度效应,复合炸药Comp.B的压缩模量和压缩强度都高于TNT炸药,Comp.B对温度效应更为敏感。还讨论了惯性效应对动态实验波形的影响,通过引入柔度系数,使测试波形趋于光滑。所介绍的实验方法为研究含能材料在低温条件下的冲击压缩性能,提供了一套较完整的技术和手段。  相似文献   

11.
利用INSTRON-1185型万能材料试验机在准静态加载环境下对不同密度的聚氨酯泡沫的抗压、抗拉及抗弯性能进行了较系统的实验研究,分析了聚氨酯泡沫材料的力学性能及吸能特性随表观密度的变化规律.研究表明,聚氨醋泡沫材料的杭压性能优于其杭拉性能,该材料具有良好的吸能特性,且其吸能特性随密度的增大而提高.  相似文献   

12.
The coarse graining of particle cluster is of great significance to the study of a fluidized bed. The effects of variations in the physical properties of supercritical water on the coarse graining of particle cluster are investigated in this work. The drag coefficient distributions of the particle cluster are not influenced by the physical properties. However, the physical properties have effects on the values of drag coefficient. The effects of physical properties are weaker in the case of large particle concentrations. Furthermore, the physical properties lead to that the effect of particle cluster wake on the drag of downstream particles being significantly different from that of constant property flow. The variation trend of drag of coarse graining particle is consistent with that of isolated particle. The physical properties lead to significant differences in the values of drag. In this paper, the dominance of the effects of physical properties in a variety of cases is confirmed. Finally, a physical properties effect model is developed accordingly.  相似文献   

13.
对石英纤维布增强氰酸酯树脂基复合材料进行了常温、低温和湿热三种环境下的拉伸、压缩、面内剪切、层间剪切和钉孔挤压等试验研究,得到了该复合材料的拉伸压缩面内剪切的强度和弹性模量以及层间剪切强度和钉孔挤压强度等力学性能参数。结果表明:石英纤维布增强氰酸酯树脂基复合材料的力学性能参数具有温度相关性。在低温环境下,力学性能参数不同程度地增强,最大增长量达40%;而在高温环境下,力学性能参数则明显下降,最高下降量达到56%。另外,由于复合材料的层间性能主要由基体决定,所以湿热环境对复合材料层间性能的影响很大,在工程实际中应特别关注。  相似文献   

14.
Proper quantitative characterization of microstructures, for the purpose of modeling the effective properties, is discussed. This is a broad subject that covers different physical properties (elastic, conductive, transport, etc.), as well as various types of microstructures. The present work focuses on microstructures that can be characterized as continuous matrices containing isolated inhomogeneities of diverse shapes, properties and orientations. We address their proper quantitative characterization in the context of elastic and conductive properties (transport and fracture-related properties are also briefly discussed).Proper microstructural parameters must correctly represent the individual inhomogeneity contributions to the considered property. They may differ for different physical properties. The key problem is to identify the mentioned individual contributions. For the elastic properties, we demonstrate, on a number of microstructures, how the proper parameters are implied by the elastic potential. Relative importance of various “irregularity factors” (shape irregularities, orientation scatter) is analyzed.We discuss similarities and differences between microstructural parameters intended for different physical properties. The possibility of explicit cross-property connections between two physical properties depends on whether the proper microstructural parameters for these two properties are sufficiently similar. We outline such explicit connections between the elastic and the conductive properties.The micromechanical approach is compared with the one based on an a priori introduced “fabric” tensors and general tensor representations that contain a number of uncertain factors. Various problems arising in this context are discussed.  相似文献   

15.
高碱值复合磺酸钙-钛基脂的制备及其摩擦学性能研究   总被引:1,自引:0,他引:1  
本文将高碱值磺酸钙与复合钛基润滑脂融合,制备出一种新的复合磺酸钙-钛基润滑脂,并对其理化性能、摩擦学性能及机理进行了研究分析.结果表明:新的复合磺酸钙-钛基润滑脂在摩擦表面生成了含有二氧化钛的摩擦保护膜,有效降低了摩擦系数并在常温条件下表现出优异的润滑性能.同时高温下摩擦表面生成了更多的含硫酸盐成分,而生成的二氧化钛含量相对减少,高温条件下呈现减摩性能优异,但抗磨损性能降低的特点.  相似文献   

16.
以C60富勒烯外部、C60富勒烯内部以及C60富勒烯内/外同时掺杂不同数量Ar原子的碳纳米豆荚为研究对象,采用分子动力学方法,模拟了这些碳纳米豆荚的压缩与拉伸过程,讨论了Ar掺杂形式、Ar掺杂量对纳米豆荚压缩与拉伸力学特性的影响。研究表明,Ar掺杂后,碳纳米豆荚的压缩力学特性有所改善,且Ar掺杂量多的压缩力学特性越好;C60富勒烯内部、外部同时掺杂Ar原子的纳米豆荚的承压能力最好,其次是C60富勒烯内部掺杂纳米豆荚,再次是C60富勒烯外部掺杂纳米豆荚;Ar掺杂形式、掺杂量对纳米豆荚的拉伸力学特性无显著影响。  相似文献   

17.
Intermediate filaments are one of the key components of the cytoskeleton in eukaryotic cells, and their mechanical properties are found to be equally important for physiological function and disease. While the mechanical properties of single full length filaments have been studied, how the mechanical properties of crosslinks affect the mechanical property of the intermediate filament network is not well understood. This paper applies a mesoscopic model of the intermediate network with varied crosslink strengths to investigate its failure mechanism under the extreme mechanical loading. It finds that relatively weaker crosslinks lead to a more flaw tolerant intermediate filament network that is also 23% stronger than the one with strong crosslinks. These findings suggest that the mechanical properties of interfacial components are critical for bioinspired designs which provide intriguing mechanical properties.  相似文献   

18.
19.
On properties of hyperchaos: Case study   总被引:1,自引:0,他引:1  
Some properties of hyperchaos are exploited by studying both uncoupled and coupled CML. In addition to usual properties of chaotic strange attractors, there are other interesting properties, such as: the number of unstable periodic points embedded in the strange attractor increases dramatically increasing and a large number of low-dimensional chaotic invariant sets are contained in the strange attractor. These properties may be useful for regarding the edge of chaos as the origin of complexity of dynamical systems. The project supported by the National Natural Science Foundation of China  相似文献   

20.
A new model, piecewise-exponential model (PE model), is developed to investigate the crack problem of the functionally graded materials (FGMs) with arbitrary properties. In the PE model, the functionally graded material is divided into some nonhomogeneous layers along the gradient direction of the properties, with each layer’s properties varying exponentially. By this way, the real material properties can be approached by a series of exponential functions. Since the real material properties are used on both surfaces of each nonhomogeneous layer, the nature of continuously varying properties of FGMs can be approached accurately. The influences of the local nonhomogeneity on the crack-tip fields can be fully considered. By using the new model, the fracture problem of a functionally graded strip with arbitrary properties and a crack vertical to the free surfaces is studied. The integral transform method, the theory of residues and the theory of singular integral equation are applied. Some representative samples with different kinds of nonhomogeneous properties are analyzed and the corresponding stress intensity factors (SIFs) are presented. It is shown that the PE mode is effective for investigating the crack problems of the FGMs with arbitrary properties.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号