首页> 中文期刊> 《兵工学报》 >骨料粒径对混凝土靶抗高速破片侵彻影响的实验研究

骨料粒径对混凝土靶抗高速破片侵彻影响的实验研究

         

摘要

为考察骨料粒径对混凝土材料抗高速破片侵彻的影响,利用轻气炮加速装置和激光测试系统进行素混凝土(PC)和钢纤维增强混凝土(SFPC)侵彻实验研究,通过高速摄像机记录弹体着靶姿态和靶体动态损伤过程.实验中混凝土靶选用5 ~10 mm、10~15 mm、15 ~20 mm 3种不同级别骨料粒径,通过对侵彻深度、成坑体积以及靶体碎片剥落过程的比较发现:针对素混凝土靶体,3种级别粒径范围内,级别最大的骨料粒径靶体其抗侵彻能力达到最强;而对于钢纤维含量为1%的钢纤维增强混凝土,粒径级别为10 ~ 15 mm的靶体抗侵彻能力最佳,结合骨料粒径对混凝土断裂能的双重作用,表明钢纤维的含量与骨料粒径之间存在一个优化值,在这个优化值配比下,钢纤维增强混凝土抗高速破片的侵彻能力能够达到比较理想的效果.实验结果的讨论分析对混凝土防护工程的设计具有借鉴作用.%In order to investigate the effect of aggregate size on the anti -penetration ability of concrete targets subjected to high-velocity fragments, a two-stage light-gas gun as the accelerate facility and laser light barrier measurement system were employed to conduct the penetration experiments for plain concrete targets and steel fiber-reinforced concrete targets, and the projectile pose and the dynamic damage process of targets were recorded by a high-speed camera. In the experiments, three different aggregate sizes on 5 ~ 10 mm, 10 ~ 15 mm and 15 ~ 20 mm were involved. The results of penetration depth, crate volume and debris spall processes indicate that the large aggregate size corresponds to the increase of anti-penetration ability for plain concrete targets, but the target with 10 ~ 15 mm of aggregate size has the optimum efficiency in terms of anti-penetration ability when comparing to the other two kinds of concrete targets for steel fiber-reinforced concrete targets with 1% steel fiber in volume. Considered the effect of aggregate size on the fracture energy of concrete materials, it indicates that there exists an optimum ratio between the content of steel fiber and aggregate size, and under the optimum ratio, the ability of anti-penetration of concrete targets can reach the maximum value. The results in this paper is very beneficial to the design of protection engineering.

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