模拟混凝土板侵彻问题的一种新算法

A new algorithm for simulating penetration problem of concrete plate

为了研究动能弹侵彻混凝土靶板的物理机制,采用改进的Youngs界面方法,得到了锥形动能弹侵彻混凝土靶板的数值模拟结果,靶板正面在弹体头部位置的压力峰值最大,靶板背面次之,其次分别是靶板内弹体近旁和距离弹体较远的点.侵彻过程不仅对轴向混凝土靶材料有压缩破坏作用,而且对其径向也有较大的挤压作用.随着侵彻过程的进行,弹体头部与靶孔边缘相分离,随后靶板被击穿,背面鼓包崩落.弹体的整体穿透过程是一种刺穿性的模式.计算结果与实验现象和物理规律一致,这也说明所采用的计算方法和程序代码是正确的,并可以为工程设计提供理论依据.

To study the mechanism of penetration into concrete target, based on the modified Youngs interface method, the numerical simulation results of the conical nose rod projectile penetrating uprightly into concrete target were obtained. The peak pressure of shock waves at the top of the projectile, at the reverse side of concrete target, beside the projectile in concrete target and at a great distance from the projectile decrease from maximum to minimum respectively. The penetration produced compressive damage effect to the axial concrete and extrusion one to the radial concrete. With the process of penetrating, the nose of the projectile and edge of the hole in concrete target separate and then the concrete target was penetrated through, and the cupola at the reverse side of concrete target begin to collapse. The destruction model for the conical nose projectile was a stabbing one. These agree with the experimental phenomena and the principle of physics. It also indicates that the algorithm and the code presented above are correct, which provide a direct theoretic basis for improving the engineering designs.