Numerical Simulation of Al Sphere Fragmentation under High-Velocity Normal Impacting Aluminum Mesh Bumper
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摘要: 采用LS-DYNA软件的光滑粒子算法，模拟铝球弹丸高速正撞击铝网防护屏，研究了弹丸撞击铝网防护屏破碎所形成的弹丸碎片云特性与弹丸撞击铝网位置的关系，分析了多层铝网防护屏叠加方式对弹丸撞击破碎的影响。结果表明，铝球弹丸撞击铝网防护屏所产生的碎片云形态随弹丸撞击位置的不同而不同，且弹丸碎片云前端出现触须状碎片簇，存在多处局部能量集中；弹丸撞击网丝交叉点时，弹丸碎片分布较均匀，碎片云主要扩展为薄膜状；多层铝网交错叠加时，弹丸碎片云扩散面积更大，剩余能量较小，有利于提高铝网防护屏的高速撞击防护能力。Abstract: Numerical simulation of aluminum sphere projectile high-velocity impacting aluminum mesh bumper was conducted with Smoothed Particle Hydrodynamics (SPH) arithmetic of LS-DYNA. The relationship between the debris clouds characteristic of projectile and the impact position on aluminum mesh bumper was studied. The effect on fragmentation of projectile from different combination mode of aluminum mesh bumper was analyzed. The results indicated that the debris clouds configuration from aluminum sphere projectile impacting aluminum mesh bumper was different with the different impact position on aluminum mesh bumper. The debris clouds as palpus was found in the front of projectile debris clouds. Some local kinetic energy concentrated appeared in the debris clouds. When a wire across point position was impacted, projectile debris clouds expand to form film configuration, and debris clouds distribution was more uniform. When aluminum mesh bumper was combined with interleaving mode, projectile debris clouds had more diffuse area and less residual kinetic energy. Aluminum mesh bumper combined with interleaving mode was helpful in enhancing the protection performance of shields.
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Key words:
- aluminum mesh bumper /
- high-velocity impact /
- fragmentation /
- debris clouds /
- simulation
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