Hypersonic impact flash characteristics of a long-rod projectile collision with a thin plate target  

作　　者：Yi-jiang Xue Qing-ming Zhang Dan-yang Liu Ren-rong Long Yang-yu Lu Tian-fei Ren Liang-fei Gong 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Defence Technology（防务技术）》2021年第2期375-383,共9页Defence Technology

基　　金：This work was supported by the National Key R&D Programof China(Grant No.2016YFC0801204);the National Programon Key Basic Research Project of China(973 Program,Grant No.613312).

摘　　要：Impact flash occurs when objects collide at supersonic speeds and can be used for real-time damage assessment when weapons rely on kinetic energy to destroy targets.However,the mechanism of impact flash remains unclear.A series of impact flash experiments of flat-head long-rod projectiles impacting thin target plates were performed with a two-stage light gas gun.The impact flash spectra for 6061 aluminum at 1.3e3.2 km/s collision speeds were recorded with a high-speed camera,a photoelectric sensor,and a time-resolved spectrometer.The intensity of the impact flash exhibited a pulse characteristic with time.The intensity(I)increased with impact velocity(V0)according to IfVn 0,where n?4.41 for V0>2 km/s.However,for V0<2 km/s,n?2.21,and the intense flash duration is an order of magnitude less than that of higher V0.When V0>2 km/s,a continuous spectrum(thermal radiation background)was observed and increased in intensity with V0.However,for V0<2 km/s,only atomic line spectra were detected.There was no aluminum spectral lines for V0<2 km/s,which indicated that it had not been vaporized.The initial intense flash was emission from excited and ionized ambient gases near the impact surface,and had little relationship with shock temperature rise,indicating a new mechanism of impact flash.

关 键 词：Hypersonic impact flash Radiation intensity Impact flash mechanism Environmental luminescence 

分 类 号：TJ410[兵器科学与技术—火炮、自动武器与弹药工程]