弹体侵彻混凝土板的挤凿机理分析方法

本文从挤凿机理出发，考虑了混凝土本构关系中的软化特性，提出了分析混凝土板在亚弹性速弹体垂冲击下的侵彻过程的两阶段弹塑性挤凿模型，关于弹体速度的变化规律，靶板抗力的变化规律得到了与经验公式和扩孔法较为接近的结果。

A PUNCHING SHEAR ANALYSIS METHOD OF CONCRETE SLAB PENETRATED BY MISSILE

The soft characteristic in constitutive relation of concrete is considered and a two-stage punching shear model to predict the penetration and perforation of concrete slab impacted normally by low velocity missile is presented in this paper. The curves of missile's velocities and target's resistances with respect to penetration depth are obtained. These results are close to those obtained with the experience expression and the cavity-expansion method. The diameter of hole at the target' s rear after perforation is also obtained and compared with experimental results.