Penetration into Low-Density Media: In situ Observation of Penetration Process of Various Projectiles
Penetration into Low-Density Media: In situ Observation of Penetration Process of Various Projectiles
复制标题
低密度介质侵彻：各种弹丸侵彻过程的原位观察
DOI：
10.1016/j.icarus.2012.08.026
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发表时间：
2012
期刊：
影响因子：
3.2
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
Kadono;T.;et al
为了了解弹丸对低密度靶的侵彻过程，我们使用低密度（60mgcm−3）气凝胶靶和各种类型的弹丸进行了超高速撞击实验，并使用高速摄像机观察了靶中的径迹形成过程。形成胡萝卜形轨道、球根形轨道和由球根形部分和薄部分组成的“杂交”轨道。高速摄影观测的结果揭示了这些径迹的穿透深度和最大直径随时间演化的相似性和差异性。在撞击的非常早期阶段，与射弹类型无关，时间穿透深度由原始射弹的流体动力学模型描述。之后，当射弹的分裂没有发生时，完整的射弹继续穿透气凝胶。在抛射体破裂的情况下，轨迹在最后阶段以大约气凝胶声速的速度膨胀。如果有大的碎片，它们会穿透得更深，痕迹会变成混合类型。用流体动力学模型描述了大碎片的穿透过程。在此基础上，讨论了冲击波作用下弹着点附近的开挖问题。
In order to understand the penetration process of projectiles into lower-density targets, we carry out hypervelocity impact experiments using low-density (60mgcm−3) aerogel targets and various types of projectiles, and observe the track formation process in the targets using a high-speed camera. A carrot shaped track, a bulbous, and a “hybrid” one consisting of bulbous and thin parts, are formed. The results of the high-speed camera observations reveal the similarity and differences on the temporal evolution of the penetration depth and maximum diameter of these tracks. At very early stages of an impact, independent of projectile type, the temporal penetration depth is described by hydrodynamic models for the original projectiles. Afterward, when the breakup of projectiles does not occur, intact projectiles continue to penetrate the aerogels. In the case of the breakup of projectiles, the track expands with a velocity of about a sound velocity of the aerogel at final stages. If there are large fragments, they penetrate deeper and the tracks become a hybrid type. The penetration of the large fragments is described by hydrodynamic models. Based on these results, we discuss the excavation near the impact point by shock waves.