高性能钢纤维增强混凝土的抗侵彻行为及数值模拟

采用大掺量超细工业废渣取代水泥,并掺加了天然河砂以及高弹、高强的玄武岩石子,制备了不同强度等级的高性能钢纤维增强混凝土材料。采用φ25mm弹道炮开展了初速度为500～850m/s的正侵彻实验,获得了弹丸着靶速度、最大侵彻深度、弹坑直径以及靶体破坏形态等实验参数,采用经典公式对侵彻深度进行了分析,同时采用非线性有限元方法对侵彻全过程进行了数值模拟。结果表明:侵彻深度随着材料强度等级的提高略有降低,粗集料的掺加有利于提高靶体的抗侵彻能力,随着纤维掺量的降低以及侵彻速度的提高,材料破坏程度明显加剧,数值模拟结果同试验结果吻合较好,侵彻深度的模拟结果与试验值的误差均在5%以内。

ANTI-PENETRATION BEHAVIOR OF ULTRA-HIGH PERFORMANCE STEEL FIBER REINFORCED CONCRETE AND ITS NUMERICAL SIMULATION

High performance steel fiber reinforced concretes (HPSFRC) were prepared with a large quantity of ultra-fine industrial waste powder as substitution of Portland cement. River sands and basalt stones with high elastic modules and high strength were also added. The ballistic experiments with projectile velocities of 500-850 m/s were performed by using a φ25 mm ballistic gun to inves-tigate the anti-penetration performances of the HPSFRC. The impact velocity, maximal penetration depth, crater dimension and target failure model were obtained. The penetration depths were analyzed by the classical theory. In addition, the whole process of projec-tiles penetrate into concrete targets was simulated by nonlinear finite element method. The results show that the penetration depth changes slightly with an increase of compressive strength of concrete. The coarse aggregates had a positive effect on the an-ti-penetration performances. The impact surface of the target was destroyed more seriously with the decrease of addition of steel fiber and the increase of projectile velocity. The numberical simulation results show a good agreement with the experimental data at low errors of penetration depths of less than 5%.