钢纤维混凝土抗侵彻与贯穿特性的实验研究

On anti-penetration and anti-perforation characteristics of high-strength steel fiber-reinforced concrete

为考察素混凝土及钢纤维混凝土(钢纤维为平直型与端钩型,体积分数0.01～0.05)抗侵彻贯穿特性,采用12.7mm弹道炮-测速靶系统开展了初速297～848m/s的弹道冲击实验,获得了弹丸着靶速度及对应的最大侵彻深度、弹坑直径、靶体(板)破坏形态等实验参数,并利用高速摄影系统记录了靶体(板)的动态破坏过程。实验结果的对比表明,靶板的抗侵彻贯穿性能和破坏模式与钢纤维类型及含量密切相关。当钢纤维体积分数为0.05时,端钩型钢纤维混凝土的侵彻深度与相同强度等级素混凝土相比降低约52%,且贯穿破坏后靶板碎片的数量及飞散角度大幅降低,显示了高含量异型钢纤维混凝土在抗侵彻贯穿方面的适用性。

Ballistic experiments with projectile velocities of 297-848 m/s were performed by using a Ф12.7 mm ballistic gun to investigate the anti-penetration and anti-perforation performances of the plain concrete and steel fiber-reinforced concrete （SFRC） with different steel fiber volume fractions and types. The steel fibers include the fiat-straight and hooked-end ones, and their range of volume fraction is from 0.01 to 0.05. The impact velocity, maximal penetration depth, crater diameter, target failure model were obtained. The dynamic failure processes of all targets were observed by means of a high-speed camera. Experimental results show that the penetration depth of the projectile in SFRC in which the hooked-end steel fiber volume fraction is 0.05 decreases by 52% compared with that in the plain concrete with the same strength grade, and the .quantity and scattering angle of the target debris decrease largely. Therefore SFRC with high volume fraction of deformed steel fibers is effective on anti-penetration and anti-perforation.