Volume 40, Number 4, August 2022
|Page(s)||819 - 828|
|Published online||30 September 2022|
Response behavior of double layer tungsten fragments under detonation loading
ZNDY Ministerial Key Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
Under detonation loading, the prefabricated fragments in the warhead will be greatly deformed and even broken. In order to explore the model of deformation, the dynamic response of double-layer spherical tungsten fragments under detonation loading was studied. Firstly, a typical cylindrical warhead model was numerically simulated. The simulation model for the characteristic section only includes the quarter model for the double row fragments in the axial direction, in order to obtain the deformation response of the fragments under the detonation loading. The full-size 1/4 simulation model is designed to obtain the axial velocity distribution of the fragment. In the characteristic section, the charge diameter was used as the variable to simulate five charge sizes, and the fragment deformation law was obtained. In order to verify the correctness of the simulation, the warhead of 400 mm caliber was tested, and the flight speed of the fragment was measured. Some deformed fragments were obtained by soft recovery and their cross-section microstructure were analyzed by scanning electron microscope (SEM). The results show that the deformation of the inner layer of the double-layer spherical tungsten alloy fragment is more serious under the action of the internal explosion load, because it is squeezed by the internal explosion load and the outer layer fragment at the same time. The final dispersion velocities of the inner and outer fragments tend to be the same, and there is no significant difference in the distribution of fragments.
在爆轰加载下, 战斗部中的预制破片会产生很大的变形甚至破碎。为了对其变形模式进行探索, 对圆柱战斗部下, 双层球形钨合金破片在爆轰加载下的动态响应行为进行了研究。对典型的圆柱战斗部模型进行了数值模拟。特征段的仿真模型仅包括在轴向上的双列破片1/4模型, 其目的是获得破片在爆轰加载下的变形响应; 全尺寸1/4仿真模型则是为了获得破片在轴向的速度分布情况。其中, 特征段仿真以装药直径为变量, 对5个装药尺寸进行模拟, 得到了其破片变形规律。为了验证仿真情况的准确性, 对400 mm口径装药战斗部进行了试验验证, 试验中测得了破片的飞行速度。通过软回收获得了部分经爆轰加载后已经产生变形的破片, 并对其截面组织进行扫描电镜分析。研究结果表明, 双层球形钨合金破片在内部爆炸载荷作用下, 内层变形更为严重, 其原因是同时受到内部爆炸载荷和外层破片的挤压作用。内外层破片的最终飞散速度趋于一致, 并没有明显的分布差距。
Key words: detonation loading / fragment driving / dynamic response / numerical simulation
关键字 : 爆轰加载 / 破片驱动 / 动态响应 / 数值模拟
© 2022 Journal of Northwestern Polytechnical University. All rights reserved.
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