Effect of the interval between two shocks on ejecta formation from the grooved aluminum surface  

作　　者：Mingyang Xu Jianli Shao Weidong Song Enling Tang 

机构地区：[1]School of Equipment Engineering,Shenyang Ligong University,Shenyang 110159,China [2]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Defence Technology（防务技术）》2024年第3期147-159,共13页Defence Technology

基　　金：supported by the Doctoral Research Launch Foundation of Liaoning Province(Grant No.2022-BS-185),China;the Science Challenge Project(Grant No.TZ2016001),China;the National Natural Science Foundation of China(Grant Nos.11972092,12172056,12002049),China;the key Laboratory of Computational Physics(Gant No.HX02021-24)720-24);Shenyang Ligong University Talent Introduction Support Fund,China。

摘　　要：This work focuses on the effect of the interval between two shocks on the ejecta formation from the grooved aluminum(Al_(1100))surface by using smoothed particle hydrodynamics numerical simulation.Two unsupported shocks are obtained by the plate-impact between sample and two flyers at interval,with a peak pressure of approximately 30 GPa for each shock.When the shock interval varies from 2.11 to 7.67 times the groove depth,the bubble velocity reduces to a constant,and the micro jetting factor R_(J) from spike to bubble exhibits a non-monotonic change that decreases initially and then increases.At a shock interval of 3.6 times the groove depth,micro jetting factor R_(J) from spike to bubble reaches its minimum value of approximately 0.6.While,the micro jetting factor R_(F) from spike to free surface decreases linearly at first,and stabilizes around 0.25 once the shock interval surpasses 4.18 times the groove depth.When the shock interval is less than 4.18 times the groove depth,the unloading wave generated by the breakout of the first shock wave is superimpose with the unloading part of the second shock wave to form a large tensile area.

关 键 词：EJECTA MICROJET Two shocks INTERVAL Smoothed particle hydrodynamics 

分 类 号：TJ01[兵器科学与技术—兵器发射理论与技术] O35[理学—流体力学]