Numerical Simulation of Projectile Penetrating Double-Layer Plate Liquid-Filled Structure Based on Material Point Method
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摘要: 在充液结构内设置双层隔板空气夹层可以有效减弱水锤效应带来的危害。为了研究双层隔板间距及位置对水锤效应的影响机理，通过已发表的试验数据对数值模拟方法进行验证后，基于物质点法开展了射弹侵彻双层隔板充液结构的数值模拟，分析了空穴形成过程、射弹剩余速度、固定点液体压力峰值、出入射壁及双隔板壁变形等情况。结果表明：随着双层隔板间距增大，充液结构的变形程度呈先减轻后加重的趋势；双层隔板位置越靠近入射壁，对压力冲击波传导的阻碍作用越强，充液结构的抗侵彻能力越好。Abstract: The double-layer plate air-container set in the liquid-filled structure can effectively reduce the harm caused by the hydrodynamic ram. In order to study the influence mechanism of the spacing and position of the double-layer plate on the hydrodynamic ram process, the numerical simulation of projectile penetration into the double-layer plate liquid-filled structure was carried out based on the material point method (MPM). The validity of the MPM numerical model is verified by experiments. The cavitation process, the residual velocity of projectile, the peak pressure of liquid at fixed points, the deformation of entry wall, exit wall and the double-layer plates were analyzed. The results show that with the increase of the spacing of the double-layer plate, the deformation of the liquid-filled structure shows a trend of first reducing and then increasing. The closer the position of the double-layer plate to the entry wall, the stronger the obstruction of the transmission of pressure shock wave, and the better the penetration resistance of the liquid-filled structure.
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Key words:
- liquid-filled structure /
- penetration /
- hydrodynamic ram /
- material point method
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图 4 100%充液率下测点压力时程曲线
Figure 4. Time-history curves of pressure at measuring points with 100% filling rate
图 5 双层隔板充液结构模型和压力测点位置
Figure 5. Model of double-layer plate liquid-filled structure and the location of the pressure measuring points
图 7 不同双层隔板间距情况下空穴的形成过程
Figure 7. Process of cavitation with different settings of double-layer plate spacing
图 8 双层隔板间距不同时射弹的剩余速度
Figure 8. Residual velocity of projectile under different settings of double-layer plate spacing
图 9 双层隔板间距不同时不同测点的压力时程曲线
Figure 9. Time-history curves of pressure at different measuring points under different settings of double-layer plate spacing
图 10 出入射壁及双隔板的变形情况
Figure 10. Deformation of the entry wall, exit wall and the double-layer plates
图 12 不同双层隔板位置情况下空穴的形成过程
Figure 12. Process of cavitation with different position settings of the double-layer plate
图 13 双层隔板位置不同时射弹的剩余速度
Figure 13. Residual velocity of projectile with different position settings of the double-layer plates
图 14 双层隔板位置不同时不同测点的压力时程曲线
Figure 14. Time-history curve of pressure at different measuring points with different position settings of the double-layer plates
图 15 出、入射壁及双隔板变形情况
Figure 15. Deformation of the entry wall, exit wall and the double-layer plates
Material ρ/(kg∙m−3) E/GPa ν A/MPa B/MPa n C m D1 Al6063-T5 2700 71 0.33 200 144 0.62 0 1 0.2 4340 steel 7830 207 0.28 
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