弹体高速侵彻预损伤混凝土作用过程数值模拟研究

Numerical Simulation of High-speed Projectile Penetration Pre-damaged Concrete Target

摘要

为分析预损伤混凝土对后级弹体侵彻过程的影响规律,建立了聚能射流侵彻混凝土靶和弹体侵彻预损伤混凝土靶数值模拟模型,结合试验数据验证了数值模拟方法的可靠性。在此基础上,进一步分析了弹体侵彻预损伤混凝土靶的侵彻作用过程,探讨了弹体直径及初速对弹体侵彻性能、变形及装药过载的影响规律。研究结果表明:在靶体预损伤范围内,当靶体预损伤开孔直径为15mm、弹体直径从2倍增至3.3倍开孔直径时,靶体预损伤使弹体过载峰值的降低比例由32.7%减小至16.4%,装药过载峰值降低率由30.9%减小至16.1%。靶体预损伤对弹体及装药过载的影响效果随着弹体尺寸的增加而逐渐减弱;当弹体直径小于预损伤靶体3倍开孔直径时,靶体损伤对减小弹体与内部装药过载具有显著效果,对应侵彻能力增益在20%以上,随着弹体直径的持续增加,弹体所受阻力增加,增益效果减弱;在800~1200m/s初速范围内,随着初始速度增加,靶体损伤对弹体侵彻能力的相对增益效果逐渐减小。

Abstract

To analyze the influence of pre-damaged concrete on the subsequent penetration process of projectiles, numerical simulation models were established for shaped charge jet penetrating into concrete targets and projectile penetrating into pre-damaged concrete targets. The reliability of the numerical simulation method was validated by comparing with experimental data. On this basis, further analysis was conducted on the penetration process of projectiles into pre-damaged concrete targets, and the effects of projectile diameter and initial velocity on projectile penetration performance, deformation, and charge overload were explored. The research results indicate that within the range of target pre-damage, when the pre-damage hole diameter of the target is 15mm and the projectile diameter increases from 2 times to 3.3 times the hole diameter, the reduction ratio of load peak on the projectile decreases from 32.7% to 16.4%; the reduction rate of load peak on the charge decreases from 30.9% to 16.1%. The effect of target pre-damage on projectile and charge overload gradually weakens as the projectile size increases. When the projectile diameter is less than three times the pre-damage hole diameter of the target, the damage to the target significantly reduces the overloads on the projectile and internal charge, resulting in an increase of penetration capability of more than 20%. As the projectile diameter continues to increase, the resistance experienced by the projectile increases, leading to a decrease in the gain effect. Within the initial velocity range of 800m/s to 1200m/s, the relative gain effect of target damage on projectile penetration capability gradually decreases as the initial velocity increases.

关键词

预损伤混凝土 / 聚能装药 / 高速侵彻 / HJC模型

Key words

pre-damaged concrete / shaped charge / high-speed penetration / HJC model

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基金资助

国家自然科学基金(12202205)

国家自然科学基金(12141202)