刚性弹正侵彻钢筋混凝土靶阻力模型

建立刚性弹的侵彻阻力模型,是对钢筋混凝土靶侵彻进行理论建模时首先需要解决的问题。针对现有模型的不足,以文献3]中钢筋混凝土空腔膨胀理论和文献4]中开坑深度模型为基础,通过研究弹体与钢筋的相互运动、钢筋的受力和失效,给出了弹体冲击作用下的钢筋动态响应模型;基于单根钢筋对弹体的碰撞作用力,考虑不同典型着靶位置以及弹体同时与两层钢筋相互作用的情况,建立了较为完备的钢筋混凝土靶侵彻阻力模型;结合文献13-14,18-20]中的实验数据对该模型进行了验证与参数影响分析。结果表明:新模型能够较为合理地计算侵彻过程,反映了弹体与钢筋碰撞作用的细节,可为弹体侵彻及钢筋混凝土防护的工程实践提供理论参考。

Resistance Model of Rigid Projectile Penetrating into Reinforced Concrete Target

Establishing the penetration resistance model of rigid projectile is the primary problem to be solved when the penetration of reinforced concrete target is theoretically modeled.Based on the cavity expansion theory of reinforced concrete3] and the crater depth model4],a dynamic response model of reinforcing steel bar under impact load of projectile is proposed by analyzing the movement relationship between projectile and reinforcing steel bar,as well as the force and failure of reinforcing steel bar.On the basis of impact force acting on projectile by a single reinforcing steel bar,a relatively complete resistance model of rigid projectile normally penetrating into reinforced concrete target is established by considering the situations that the projectiles impact different typical positions and simultaneously interact with two reinforced layers.Combining with the experimental data in Ref.13-14,18-20],the proposed theoretical model is verified,and the influences of relevant parameters are analyzed.The results show that the proposed model can reasonably calculate the penetration process and reflect the details of the interaction between projectile and steel bar.