Explosive Interruption of Tandem Warhead with Different Multilayer Structures
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摘要: 为了有效提升串联切割战斗部隔爆结构衰减爆炸冲击波的性能，解决前级聚能装药结构与后级随进弹的匹配及隔爆问题，在前级切割器和后级随进弹之间加装隔爆结构，使用有限元分析软件ANSYS/LS-DYNA建立模型，进行不同组合结构隔爆性能的数值模拟，比较隔爆能力。模拟结果表明：前级装药起爆后，爆炸冲击波首先向后级随进弹头靠里区域汇聚，而不是向弹头尖端区域汇聚，因此可以适当减薄外层金属隔爆介质头部尖端区域；将外层金属由硬质钢改成铝时，后端壳体应力峰值的变化很小，故确定外层金属介质为铝；铝-聚脲的隔爆能力优于铝-泡沫铝结构，最终确定“软”隔爆介质为聚脲。通过调整铝和聚脲层的厚度，确定了最佳隔爆参数，能够满足实际应用。Abstract: In this work we improved the explosion shock wave mitigation capability of the interruption structure in the tandem cutting warhead and matched the front shaped charge with the post-stage projectile and the explosive interruption by installing the explosive interruption structure between the front cutter and the rear following projectile, and established the simulation model using ANSYS/LS-DYNA, a finite element analysis software. We also analyzed the mitigation capabilities of the structures in different combinations and compared their explosive interruption capabilities using numerical simulation. The results showed that the explosion shock wave first converged to the inner region of the projectile, rather than to the tip of the warhead, so that the tip area of the outer metal flameproof medium was thinned properly. When the outer metal turned from hard steel to aluminum, little change was observed in the stress peak value of the rear end shell, suggesting that the outer metal medium was aluminum. Judging by the comparative study, the aluminum polyurea flameproof capability was superior to the aluminum foam-aluminum structure. Finally, the "soft" explosive interruption medium was determined to be polyurea, and the best explosion proof parameters were determined by adjusting the thickness of the aluminum and polyurea layer, which serves the needs of practical applications.
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Key words:
- tandem warhead /
- shock wave /
- multilayered media /
- explosive interruption
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图 1 反射波与透射波Hugoniot关系计算曲线
Figure 1. Hugoniot curves of reflection and transmission wave
图 2 串联战斗部及隔爆结构有限元模型
Figure 2. Finite element model of tandem warhead and explosive interruption structure
图 3 工况I中装药压力及壳体应力分析
Figure 3. Loading pressure and shell stress of working condition I
图 5 工况II装药压力及壳体应力分析
Figure 5. Loading pressure and shell stress of working condition II
图 6 工况III装药压力及壳体应力
Figure 6. Loading pressure and shell stress of working condition III
图 9 后级随进弹加速度-时间变化曲线
Figure 9. Acceleration vs. time for the following stage’s incoming projectile
图 10 后级随进弹速度-时间变化曲线
Figure 10. Velocity vs. time for the following stage’s incoming projectile
图 11 串联战斗部及改进隔爆结构有限元模型
Figure 11. Finite element model of tandem warhead and improved explosive interruption structure
图 12 工况I′装药压力及壳体应力
Figure 12. Loading pressure and shell stress of working condition I′
图 13 工况II′装药压力及壳体应力分析
Figure 13. Loading pressure and shell stress of working condition II′
图 14 工况III′装药压力及壳体应力分析
Figure 14. Loading pressure and shell stress of working condition III′
图 15 工况IV′装药压力及壳体应力分析
Figure 15. Loading pressure and shell stress of working condition IV′
图 16 后级随进弹加速度-时间变化曲线
Figure 16. Acceleration vs. time for the following stage’s incoming projectile
图 17 后级随进弹加速度-时间曲线
Figure 17. Velocity vs. time for the following stage’s incoming projectile
表 1 B炸药材料参数
Table 1. Material parameters of composition B
ρ/(g·cm-3) D/(m·s-1) pCJ/GPa A/GPa B/GPa R1 R2 ω E0/GPa V0 1.713 7 500 28.6 524.2 7.678 4.2 1.1 0.34 8.499 1.0 
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表 2 30CrMnSiNi2A钢和金属铝计算参数
Table 2. Material performance parameters of 30CrMnSiNi2A steel and aluminum
Material AJC/MPa BJC/MPa n C m Tm/K T0/K S1 γ0 a Steel 1 280 420 0.30 0.030 1.00 1 793 294 1.490 2.17 0.46 Al 265 426 0.34 0.015 1.00 775 294 1.345 2.13 0.10
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表 3 不同工况及简便书写方式
Table 3. Different conditions and indications
Condition Material A B C D Ⅰ Steel Polyurea Aluminum foam Aluminum Ⅱ Aluminum Polyurea Aluminum foam Aluminum Ⅲ Aluminum Aluminum foam Aluminum foam Aluminum Ⅳ Aluminum Aluminum foam Aluminum foam Aluminum foam Ⅴ Aluminum Polyurea Polyurea Polyurea
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表 4 改进结构
Table 4. Improved structures
Condition Material A B C Ⅰ′ Steel Aluminum Polyurea Ⅱ′ Steel Aluminum Aluminum foam Ⅲ′ Aluminum Aluminum Polyurea Ⅳ′ Aluminum Aluminum Polyurea（2 cm）
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