Characterization of blast waves using solid and gaseous explosives: application to dynamic buckling of cylindrical shells

IF 1.7 4区 工程技术 Q3 MECHANICS
V. Thierry, B. Tang, P. Joffrin, T.-T. Bui, P. Berthet-Rambaud, A. Limam
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引用次数: 0

Abstract

A launcher’s engine and in particular its nozzle are subjected to several loads during the rocket launch. Most of these loads are dynamic, such as the external pressure pulse caused by the blast wave bouncing back from the floor and engulfing the nozzle. Nevertheless, they usually are considered as quasi-static in buckling computations as conservative design methods. Few studies have been investigated on dynamic buckling of thin shells subjected to external pressure pulse. Thus, a large program including experimental tests and numerical simulations have been conducted by the CNES, the French Space Agency. The main objectives are a better understanding of dynamic buckling and establishing a robust design methodology. In this context, two experimental means used for producing dynamic pulses are here considered and investigated, to explore the dynamic buckling of such structures. In one case, the shock wave is produced using a solid explosive, in the shape of a stick in which a nitrate ammonium/sodium nitrate mix is encapsulated. In another setup, the shock wave is produced using a commercial apparatus named DaisyBell. A hydrogen/oxygen mixture is detonated within a conical shock tube, producing a directional free-air-like blast. Both apparatuses are designed to be hanged above snowpack for avalanche preventive release, thus can be held at the desired height using a crane. The pulse intensity measured at the tested sample level can be tuned by moving the explosive up or down. A simplified model of the nozzle, in the form of a cylindrical shell, is proposed for the analysis. This study aims at showing how both apparatuses can be used to simulate free-air-like blasts and can cause the dynamical buckling of a steel cylindrical shell structure.

Abstract Image

固体和气体炸药爆炸波的表征:应用于圆柱壳的动态屈曲
在火箭发射过程中,发射装置的发动机,特别是它的喷管要承受多次载荷。这些载荷大多是动态的,例如由爆炸冲击波从地面反弹并吞没喷嘴引起的外部压力脉冲。然而,作为保守的设计方法,它们在屈曲计算中通常被认为是准静态的。外界压力脉冲作用下薄壳的动态屈曲研究很少。因此,法国航天局CNES开展了一个包括实验测试和数值模拟在内的大型方案。主要目标是更好地理解动态屈曲并建立稳健的设计方法。在这种情况下,本文考虑并研究了两种用于产生动态脉冲的实验方法,以探索这种结构的动态屈曲。在一种情况下,冲击波是用棒状固体炸药产生的,棒状固体炸药包裹着硝酸铵/硝酸钠混合物。在另一种设置中,冲击波是用一种名为DaisyBell的商用设备产生的。在锥形激波管内引爆氢/氧混合物,产生定向自由空气式爆炸。这两种设备都被设计为悬挂在积雪之上,以防止雪崩释放,因此可以使用起重机将其保持在所需的高度。在被测样品水平上测量的脉冲强度可以通过上下移动炸药来调节。为了进行分析,提出了一个圆柱壳形式的喷嘴简化模型。本研究旨在展示这两种装置如何用于模拟自由空气样爆炸,以及如何引起钢圆柱壳结构的动态屈曲。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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