低速弹体贯穿钢筋混凝土多层靶的破坏特性

摘要

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 pro jectile 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 of 337 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 of 0.82％ 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.