Numerical simulation of the interlayer effects for fragments impacting steel-covered charge
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摘要: 将战斗部简化为带钢壳和垫层的炸药组件，用3种不同厚度的材料作垫层，利用非线性有限元软件AUTODYN对高速破片侵彻、引爆带壳炸药的作用过程进行了数值模拟，得到了高速破片冲击起爆带壳带垫层炸药的波后压力剖面。对不同厚度多种材料作为垫层时带壳炸药的冲击到爆轰距离进行了对比分析，结果表明，通过控制垫层的材料和厚度，可以对破片冲击起爆带壳炸药进行有效抑制。研究结果对战斗部破片起爆的防护设计具有指导意义。Abstract: Non-linear dynamical finite element software AUTODYN was used to simulate the shock initiation of steel-covered charge impacted by high-velocity fragments. The interlayer effect was studied based on the pressure history of initiation when different materials and thickness interlayers were used. The results show that the interlayer material is an important factor affecting pressure history and run-to-detonation of explosives, the thickness of interlayer has the same effects. The initiation of explosives can be effectively prevented with changing the thickness and material of the interlayer.
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Key words:
- interlayer /
- steel-covered charge /
- high-velocity flyer /
- shock initiation /
- non-linear dynamic
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图 4 破片起爆过程中典型时刻炸药中的压力云图
Figure 4. Detonation pressure fields of fragment initiation at different time
图 5 不同厚度环氧树脂作为垫层时炸药中的波后压力剖面
Figure 5. Pressure history of explosives with different thicknesses epoxy interlayer
图 6 炸药的冲击到爆轰距离随硅橡胶垫层厚度的变化曲线
Figure 6. Run-to-detonation varied with the thickness of interlayer rubber
图 7 炸药的冲击到爆轰距离随不同材料垫层的变化曲线
Figure 7. Difference of run-to-detonation for the three interlayer materials
表 1 材料模型
Table 1. Material models
部件 材料 状态方程 强度模型 侵蚀模型 破片 steel 1006 Grüneisen Johnson-Cook plastic strain 壳体 steel 4340 Grüneisen Johnson-Cook plastic strain epoxy shock viscoelastic 垫层 polyethyl shock viscoelastic rubber shock viscoelastic 炸药 Comp.B ignition and growth Von mises 
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