共查询到16条相似文献,搜索用时 62 毫秒
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研究了方形钛-芳纶蜂窝夹芯板在电炮驱动的高速聚酯飞片撞击加载下的动力响应,给出了面板和蜂窝芯层在不同冲击速度下的变形及失效模式。采用VISAR(velocity interferometer system for any reflector)测速技术测量了后面板中心点的速度时程,分析了芳纶蜂窝夹芯板的动态响应过程,讨论了冲击速度对夹芯板动力响应和抗冲击能力的影响。研究结果表明,低波阻抗的芳纶蜂窝破碎行为阻断了应力波向后面板的传播途径,破碎的蜂窝和塑形大变形的前面板吸收了高速冲击的大部分能量,充分发挥了钛合金的高强度和芳纶蜂窝的缓冲吸能特性,提高了夹芯板整体的防护能力。 相似文献
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激光干涉测速技术在爆轰实验中的应用 总被引:2,自引:0,他引:2
用四探头VISAR系统测量了铜管外表面在冲击波作用下的膨胀速度以及各种材料(C11,Al,Fe,玻璃)平面飞片的自由表面速度。是的圆筒壁面径向膨胀速度大于1400m/s,平面飞片自由面运动速度大于5500m/s,各被测样品的速度-时间曲线反映了物体的连续运动过程。 相似文献
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介绍了Sandia实验室将二级轻气炮发射的变密度飞片作为输入级、碰撞次级飞片构成三级炮系统而获得超高速飞片的驱动技术。 相似文献
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利用电炮驱动Mylar膜飞片加速冲击炸药的方式,研究了炸药的飞片起爆感度试验方法,并进行了部分试验。试验结果表明,该方法的建立是可行的,并对研究和评价炸药的安全性能和可靠性有着重要的意义和价值。当前,飞片撞击炸药感度试验方法的建立还不太成熟,有待于进一步研究和探讨。 相似文献
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介绍了毫克至克量级弹丸7 km/s以上超高速发射技术的国内外研究进展,并对各发射装置的工作原理和技术要素进行了简要阐述.基于电磁驱动准等熵加载,美国ZR装置驱动25 mm×13mm×1.0mm铝飞片至46km/s速度,国内CQ系列磁驱动加载装置实现了 10mmx6mmx0.33mm铝飞片18 km/s的发射.借助于金属箔电爆炸产生高压气体驱动,美国利弗莫尔实验室100kV电炮装置驱动9.5mm×9.5 mm×0.3 mm的Kapton膜至18 km/s,国内流体物理研究所98 kJ和200 kJ电炮装置分别驱动?10 mmx0.2 mm Mylar飞片和?21 mm×0.5 mm Mylar飞片到10 km/s.基于阻抗梯度飞片技术,采用汇聚型和非汇聚型结构三级轻气炮,实现了厘米量级铝飞片和TC4钛飞片12~15 km/s速度发射.这些超高速驱动技术的发展,为空间碎片防护研究提供了坚实的技术支持. 相似文献
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火工品中飞片起爆的工程计算 总被引:1,自引:0,他引:1
本文就飞片撞击起爆炸药做了工程计算方法上的研究,给出了一套有关评价炸药能否引爆的的计算公式,其结果对火工品和传爆序列的设计以及传爆可靠性分析都具有很好的参考价值。 相似文献
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Xu Fu 《Acta Mechanica Sinica》1987,3(2):113-122
The stability of shock wave based on the definition of Landau and Lifschitz[1] is treated in this paper. This is tantamount to solving the problem of interaction of small disturbances with a shock wave.
Small disturbances are introduced on both sides of a steady, non-dissipative, plane shock wave. Landau et al.[1] obtained the stability criterionM
1>1,M
2<1 for small disturbances which are travelling in the direction perpendicular to the shock wave. In the present paper, we
assume that the small disturbances may be two dimensional, i.e. they may be propagating in the direction inclined to the shock
wave. The conclusions obtained are: regardless of whether the incident wave and diverging wave are defined according to the
direction of the phase velocity or the group velocity, the shock wave is unstable for some frequencies and longitudinal wave
lengths of the disturbances, even if the conditionsM
1>1,M
2<1 are fulfilled. Then several experiments are proposed, and the problem of ways to define the incident wave and diverging
wave is discussed. The meaning of this problem is illustrated.
The same results can be obtained for the steady shock wave in a tube. 相似文献
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Performance of a detonation driven shock tunnel 总被引:1,自引:0,他引:1
A detonation driven shock tunnel is useful as a ground test facility for hypersonic flow research. By attaching a convergent section ahead of the primary diaphragm in the driver section, the downstream operation mode became available to generate a high-enthalpy test flow. A 100 mm diameter shock tunnel was for the first time installed in the Laboratory of High-Temperature-Gas Dynamics (LHD), Institute of Mechanics, Chinese Academy of Sciences, and after its continuous refitments, a high performance detonation driven shock tunnel was achieved to generate high-enthalpy and high-Reynolds number test flows. A new method to burst a metal diaphragm with the downstream operation mode is discussed.Received: 13 December 2003, Accepted: 26 August 2004, Published online: 26 November 2004[/PUBLISHED]W. Zhao: Correspondence to 相似文献
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本文介绍了在高锰钢的轻气炮冲击实验中的一些改进措施和参数的选取,并介绍了对实验后的试件进行硬度测量的结果在爆炸硬化上的应用及对爆炸硬化的指导作用,此外,本文还测量出高锰钢的冲击波速度随所受击压力变化而变化的规律。 相似文献
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The shock wave structure in a three-component weakly ionized plasma containing fine metal particles (macroparticles) is considered. The particles are ionized due to thermionic emission and the ejected electrons adhere to molecules of the neutral carrier gas assumed to be electronegative. The resulting ion plasma contains charged components with sharply different masses which are differently decelerated in the shock wave. This leads to charge separation and the generation of self-consistent electric fields which in turn affect the motion of the charged components.__________Translated from Izvestiya Rossiiskoi Academii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, 2005, pp. 179–188.Original Russian Text Copyright © 2005 by Bityurin and Klyuchnikov 相似文献