弹体高速侵彻厚钢筋混凝土靶的数值模拟

针对厚钢筋混凝土靶在弹体高速侵彻时的毁伤特性，基于混凝土连续帽盖模型(concrete continuous cap model, CSCM)和共节点耦合建模方法对弹体高速侵彻厚钢筋混凝土靶的毁伤行为进行数值模拟，分析钢筋混凝土靶的损伤分布特性、钢筋结构对混凝土的约束作用。结果表明：高速侵彻时，延性损伤体现在混凝土内部，脆性损伤更多体现在混凝土外部表层，钢筋网能较大程度地约束混凝土延性损伤的扩展；增加竖筋的配置，可预防厚钢筋混凝土靶沿钢筋层产生层断脱离破坏，从而提高钢筋混凝土的抗弹性能；钢筋混凝土迎弹面的崩落面积随侵彻速度增加而增大，首层钢筋越接近表面，约束效果越好。可见，混凝土连续帽盖模型和共节点耦合建模方法能较好地模拟厚钢筋混凝土靶在弹体高速侵彻作用下的毁伤特性。

Numerical Simulation of Projectile Penetrating Thick Reinforced Concrete Target at High Speed

Aiming at the damage characteristics of thick reinforced concrete targets during high-speed penetration of the projectile, the damage behavior of projectiles penetrating thick reinforced concrete targets at high speed was numerically simulated based on concrete continuous cap model (CSCM) and common node coupling modeling method. The damage behavior and distribution characteristics of reinforced concrete target, the restraint effect of reinforced structure on concrete. The results show that during high-speed penetration, ductile damage is reflected in the interior of the concrete, and brittle damage is more reflected in the outer surface of the concrete. The steel mesh can restrain the expansion of the ductile damage of the concrete to a greater extent. Increasing the configuration of vertical bars may prevent the thick reinforced concrete target from causing delamination and detachment along the reinforced layer, thus improving the elastic performance of reinforced concrete. With the increase of the penetration speed, the caving area of reinforced concrete impact surface increases. The closer the first-layer rebars are to the surface, the better the restraint effect. It can be seen that the concrete continuous cap model and common node coupling modeling method can well simulate the damage characteristics of thick reinforced concrete targets under the action of high-velocity penetration of projectile.