The existing shaped charge design mainly relies on experience and a small number of target tests for trial-and-error adjustment, resulting in low accuracy and efficiency and high cost. Numerical analysis is an effective method to replace testing. However, the key parameters of numerical analysis are often obtained according to experience, which seriously affects the accuracy of numerical analysis. The pressure and damage at the moment of penetration were quantified. The response time of different interfaces and the propagation velocity of shock wave were measured by using the fly-plate of the two-stage light gas gun. The dynamic response characteristics of the high speed impact charging cover and concrete material were determined, and the D-u and P-V relationships were obtained. The particle velocity after shock wave was measured. The pressure-time curve of the penetration process was obtained, and the attenuation of shock wave, the shape of the penetration crater and the damage degree of the back target were measured. The flying plate penetration test of the projectile target medium was carried out at the impact speed of 0.9~2.5 km/s for 22 rounds. The pressure range of the projectile cover material was 20~65 GPa, and the pressure of the concrete material was 7.5~30GPa. The Hugoniot D-u relationship of the projectile target material in the pressure range was linear. The pressure-time curve of the penetration process was obtained by the 4.5 km/s penetration test. The shock wave attenuated and the penetration formed a crater shape, and the peak pressure formed by different projectile materials in the C100 concrete target was higher than that in the C80 target. The attenuation coefficient of stress waves in C80 under ultra-high-speed penetration is greater than that of C100, and the attenuation coefficients of stress waves in C100 and C80 are between 1.42~1.66 and 1.55~1.95, respectively. The research in this paper can provide key parameters for numerical analysis of shaped charge penetration, and can also provide reference for quantitative analysis of pressure and damage law at the moment of shaped charge penetration.
LI Ming-fei, SONG Zhi-tong, MI Hong-xue, WEI Liang, XIAO Xiang, DU Meng-chao.
Shaped Charge Liner Flyer Accelerated by Two-stage Light Gas Gun[J].
Science Technology and Engineering, 2026, 26(22): 9639-9651 DOI:10.12404/j.issn.1671-1815.2506642
图2为电磁飞片测试装置,无氧铜飞片通过磁环强磁场时产生感应涡流。如图3所示,由高频示波器记录并通过频谱分析得到50 ps时间分辨率的速度历史,测速范围0.1~9.0 km/s。感应涡流导致测速线圈内出现电势扰动并被示波器记录(图4),磁环间距除以飞片通过时间间隔即得到速度。激光干涉测速仪(displacement interferometer system for any reflector,DISAR)测得的信号,是试样自由面运动引起的发射光频率变化。示波器分为两组:一组记录电磁感应信号,采样频率大于20 MHz;另一组记录激光干涉仪频谱信号,采样频率与测速范围有关,本试验采用的是力科WaveMaster 813Zi-A示波器,通道数为4路,带宽为13 GHz,可满足所有测试需求。
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