Characteristics of ejecta cloud generated due to aluminum projectiles&rsquo; impacting aluminum thin plate at hypervelocity

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (5) : 188-193.

Characteristics of ejecta cloud generated due to aluminum projectiles’ impacting aluminum thin plate at hypervelocity

WANG Meng FENG Minhui TANG Enling HAN Yafei LIU Shuhua

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Abstract

Morphology and distribution characteristics of ejecta cloud generated due to micrometeoroids or space debris impacting a spacecraft surface buffer structure were studied. A two-stage light gas gun was used to accelerate aluminum projectiles to perform hypervelocity impact tests. It was shown that aluminum projectiles’ impact an aluminum thin plate at hypervelocity to sputter high temperature particles or even tiny molten droplets, etc. flash heat sources, then ejecta cloud clusters composed of metal dust and micro-debris with low velocity; those ejecta cloud clusters produced by normal impact reveal a ring cone shape distribution, the higher the impact speed, the denser the distribution, within the impact speed range of 3-5km/s. Ultra-high speed camera HSFC-PRO was employed to capture the image evolution of ejecta cloud at different instants during initial impact stage. Ejecta cloud’s one dimensional expansion velocity was estimated through tracking front outlines of flash heat sources and ejecta cloud clusters. Attitude excursion of non-sphere projectiles during impacting might have more effects on distribution of ejecta cloud clusters.

Key words

hypervelocity impact

/ aluminum alloy thin plate / ejecta cloud clusters / distribution characteristics

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WANG Meng FENG Minhui TANG Enling HAN Yafei LIU Shuhua. Characteristics of ejecta cloud generated due to aluminum projectiles’ impacting aluminum thin plate at hypervelocity[J]. Journal of Vibration and Shock, 2018, 37(5): 188-193

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