摘要:
为了研究超高速侵彻下金属蜂窝管约束混凝土结构的抗侵彻性能,利用二级轻气炮开展了1500 m/s附近弹体侵彻试验,使用物质点法模拟侵彻过程并对靶体和弹体参数的合理性进行了验证,并利用该方法研究了蜂窝管壁厚、高度、直径和材料等参数对靶体抗侵彻性能的影响规律。数值仿真表明:物质点法可以准确模拟高速侵彻过程,模拟结果与实验误差小于10%;通过正交分析得到的影响侵深的因素依次为:蜂窝管特征管深、特征内径、特征壁厚、材料;影响开坑半径的因素依次为蜂窝管特征壁厚、特征管深、材料、特征内径。对于本文所采用的弹体,根据优化结果可知:厚度4mm+高度150mm+内切圆直径30mm+钨合金组合金属蜂窝的抗侵彻性能最佳,侵彻深度较素混凝土减少25.1%;厚度4mm+高度150mm+内切圆直径90mm+铝组合金属蜂窝的抗开坑性能最佳,开坑半径较素混凝土减少28.7%;综合因素分析最优组合为:厚度4mm+高度150mm+内切圆直径30mm+铝。
Abstract:
To investigate the penetration resistance of metal honeycomb tube-constrained concrete structures under hypervelocity impact, penetration experiments were conducted using a two-stage light gas gun with projectile velocities near 1500 m/s. The Material Point Method (MPM) was employed to simulate the penetration process and validate the reasonableness of target and projectile parameters. This method was further used to analyze the effects of honeycomb tube parameters, including wall thickness, height, diameter, and material, on the penetration resistance of the target structure. Numerical simulations showed that MPM can accurately simulate high-velocity penetration processes, with simulation results deviating from experimental data by less than 10%. Through orthogonal analysis, the factors influencing penetration depth were ranked in descending order as follows: characteristic tube depth, characteristic inner diameter, characteristic wall thickness, and material. For the cratering effect, the primary influencing factors were identified as characteristic wall thickness, characteristic tube depth, material, and characteristic inner diameter. For the projectiles tested in this study, optimization results indicated the following: A combination of 4 mm wall thickness, 150 mm height, 30 mm incircle diameter, and tungsten alloy demonstrated the best penetration resistance, reducing penetration depth by 25.1% compared to plain concrete. A combination of 4 mm wall thickness, 150 mm height, 90 mm incircle diameter, and aluminum exhibited superior resistance to the cratering effect, decreasing crater radius by 28.7% compared to plain concrete. Multi-objective optimization analysis determined the optimal overall configuration to be: 4 mm wall thickness, 150 mm height, 30 mm incircle diameter, and aluminum.