圆柱形装药驱动轴向预制破片飞散特性

为了增强柱形战斗部轴向威力,在无壳柱形战斗部底面布置单层离散的预制破片。开展圆柱形TNT装药驱动轴向预制破片飞散试验,获得预制破片的最大初速、飞散角等特征参数；运用LS-DYNA软件对装药驱动预制破片过程进行数值模拟,阐述预制破片群飞散过程；对装药驱动整体平板理论计算公式进行改进,获得预制破片的最大初速。结果表明:破片初速理论计算结果、数值计算结果和试验结果吻合良好；随着与装药底部中心距离的加大,破片初速、径向飞散角分别近似呈“抛物线”减小、增大；试验实测、理论计算得到的破片最大初速值超过2500 m/s,试验实测的径向飞散角最大约为22°,而周向飞散角则普遍较小,均值在5°以内。

Projection characteristics of axial prefabricated fragments driven by cylindrical charge

In order to improve the lethality of the axial direction fragment field of the warhead, experimental and numerical studies were conducted to investigate the maximum velocity and ejection angle distribution characteristics of axial prefabricated fragments driven by caseless cylindrical TNT charge. The LS-DYNA software was used to numerically simulate the process of prefabricated fragments driven by the charge, and the flying process of the prefabricated fragments group was described. The theoretical calculation formula of the overall plate driven by the charge was improved to obtain the maximum initial velocity of the prefabricated fragments. Results indicated that close agreement was found between numerical, experimental and theoretical results for the maximum velocity of prefabricated fragments. With the increase of the distance from the central of TNT charge for fragments, the initial velocity and radial ejection angle decreased and increased respectively, while the circumferential ejection angle of fragments varying on a very small scale. According to the experimentally measured data and theoretical analysis, the maximum initial velocity of prefabricated fragment in the central area exceeded 2500 m/s, the maximum ejection angle in the radial direction was about 22°, and the mean value of ejection angle in the circumferential direction was less than 5°.