Influence of Impedance Matching between Prefabricated Fragments and Light Shell on Initial Velocity and Completeness of Fragments
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摘要: 依据杀伤战斗部装药对破片爆轰加载过程的特征，设计了与其较为相似的滑移爆轰单元结构实验模型，采用闪光X射线照相方法获得了预制破片和轻质壳体在两种典型排布顺序下的破片初速及破损情况，并结合应力波传播理论对实验结果进行了分析。结果表明：破片外置时，初始应力波由低阻抗金属材料向高阻抗金属材料传播，破片受到壳体传入的冲击波及空气传入的拉伸波作用，初速较高，轻微破损；破片内置时，初始应力波由高阻抗金属材料向低阻抗金属材料传播，虽然破片受到爆轰产物传入的冲击波及壳体反射的拉伸波作用，但初速相对偏低，易发生破损，甚至有明显层裂现象。Abstract: According to the characteristics of the detonation loading process in prefabricated fragment warhead, we designed the sliding detonation unit test model, and obtained the initial velocity and the damage of the prefabricated fragments and light shell under two typical arrangements by the X-ray photographic method, and analyzed the influence of different impedance matching structures on the accelerating character at the same time.The results show that the initial velocity of the prefabricated fragments situated outside the shell (sequential impedance matching structure) with slight damage is relatively high, whereas that of the prefabricated fragments situated inside the shell (reverse impedance matching structure) with stratification cracks is relatively low.
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Key words:
- fragment warhead /
- prefabricated fragment /
- light shell /
- initial velocity /
- X-ray photographic
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图 1 预制破片与轻质壳体的典型放置工况
Figure 1. Typical arrangements of prefabricated fragments and light shell
图 8 不同介质间应力波传播分析(①~⑥为界面编号)
Figure 8. Analysis of stress wave transmission betweendifferent materials (①-⑥:Interface No.)
表 1 不同工况下的破片及壳体速度
Table 1. Velocity of fragments and shell under different conditions
Working condition Shell Fragments k v/(m·s-1) k v/(m·s-1) Tungsten fragments situated outside aluminum shell 0.126 983 0.126 983 Tungsten fragments situated inside aluminum shell 0.143 1 115 0.110 858 
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Material ρ/(g·cm-3) c0/(km·s-1) λ Tungsten alloy 17.5 3.832 1.497 Aluminum alloy 2.785 5.238 1.338
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表 3 材料界面处的状态参数
Table 3. State parameters of material interfaces
Interface No. u/(km·s-1) p/GPa ① 0.931 16.82 ② 0.385 29.70 ③ 0.770 ④ 0.310 23.30 ⑤ 0.502 8.26 ⑥ 1.004
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