低速弹体贯穿钢筋混凝土多层靶的破坏特性

Damage Effect of Low Velocity Projectile Perforating into Multi-layered Reinforced Concrete Slabs

为获取大尺寸弹体对4层钢筋混凝土薄靶的贯穿破坏特性,开展了实验与仿真研究。以300 mm口径平衡炮作为发射平台,驱动280 kg截卵形弹体以337 m/s低速正贯穿4层抗压强度为41.8 MPa的钢筋混凝土薄靶,发现靶板破坏区域由锥形前坑区和后坑区组成。在此基础上建立了弹体正贯穿钢筋混凝土薄靶的破坏模型,并对破坏特性相关因素进行了分析。建立了有限元数值仿真模型,采用有限元分析软件LS-DYNA对整个贯穿过程进行了计算。将数值仿真结果与实验结果进行了对比,结果表明:速度及动能消耗最大误差分别为0.82%和6.21%,一致性较好;建立的数值仿真模型可用于弹体对多层靶侵彻能力的预估。

The damage effect of large-scale projectile perforating into four-layered thin reinforced concrete（ RC） slabs is investigated through experiment and numerical simulation. The truncated-ogive-nosed projectile with a mass of 280 kg is launched from a 300 mm diameter balance gun to impact on four-layered thin RC slabs with the unconfined cylinder compressive strength of 41. 8 MPa at the striking velocity of337 m/s. A damage model of thin RC slabs is presented based on the post-test macro-analysis of the damage area of RC slabs,which consists of front and rear craters. The related factors of damage effect are obtained and analyzed in detail. A finite element model is established,and the software LS-DYNA is employed to simulate the perforation process. The numerically simulated and experimentally measured values of residual velocity and kinetic energy consumption are compared,with the maximum deviations of0. 82% and 6. 21%,respectively. The simulated results are in good agreement with the experimental results. The proposed finite element model can be used for the performance evaluation of projectile perforating into multi-layered slabs.