Jetting and shock wave during oblique hypervelocity impact of spherical projectile

IF 1.5 4区 工程技术 Q3 MECHANICS
Xin Liu, Yongjun Deng, Ken Wen, Yong Yao
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引用次数: 0

Abstract

Abstract Space debris impacts on whipped shields are dominantly non-vertical. Shock initiation and interaction govern the fragmentation of projectiles and plates, directly determining the features of the produced debris cloud. During the initial impact stage of a projectile on a target, wave propagation and evolution occur in their interior with co-dominant material fragmentation. In this study, the effects of the impact conditions (impact velocity and attack angle) on the critical conditions for jet generation were examined based on the asymmetric jetting theory. In the Geometric Propagation Model (GPM), the effect of the attack angle was considered, and a wave front deflection angle parameter was introduced. The modified GPM could describe the geometric features and position of a wave front during an oblique impact. Combined with smoothed particle hydrodynamics numerical simulations, the interior of projectiles, fragmentation features, and pressure attenuation were studied. It was found that in large attack angle cases, the projectile material is more likely to reach the critical conditions for jet generation, and the jet mass proportion of the projectile material increases with increasing attack angle. The modified GPM is an oblique elliptic Eq. that is a function of the equivalent speed, impact velocity, attack angle, time, and deflection angle. It may be applicable to hypervelocity events involving any monolithic material as long as the equivalent speed and deflection angle can be provided from numerical simulations. The impact conditions exhibit a quantitative relationship with the pressure attenuation in a projectile, among which the impact velocity has a more significant effect. This study established a quantitative analysis method for initial impact stage of the oblique hypervelocity impact of a spherical projectile on a flat plate.
球面弹丸倾斜超高速撞击时的射流与激波
空间碎片对鞭笞护盾的冲击主要是非垂直的。激波的起爆和相互作用决定了弹丸和弹片的破碎,直接决定了产生的碎片云的特征。在弹丸撞击目标的初始阶段,波的传播和演化发生在弹丸内部,材料破片共占主导地位。基于非对称射流理论,研究了冲击条件(冲击速度和攻角)对射流产生临界条件的影响。在几何传播模型(GPM)中,考虑了攻角的影响,引入了波前偏转角参数。修正后的GPM可以描述斜碰撞时波前的几何特征和位置。结合光滑颗粒流体力学数值模拟,对弹丸内部、破片特征和压力衰减进行了研究。研究发现,在大攻角情况下,弹体材料更容易达到产生射流的临界条件,且弹体材料的射流质量比例随攻角的增大而增大。修正后的GPM是一个斜椭圆方程,它是等效速度、冲击速度、攻角、时间和偏转角的函数。只要能从数值模拟中得到等效速度和等效偏转角,就可以适用于涉及任何单片材料的超高速事件。冲击条件与弹丸内压力衰减呈定量关系,其中冲击速度的影响更为显著。本研究建立了球形弹丸斜向超高速撞击平板初始冲击阶段的定量分析方法。
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
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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