DDA方法中的两种无反射边界研究  

TWO NON-REFLECTING BOUNDARY CONDITIONS IN DDA METHOD

作　　者：甯尤军[1] 杨军[1] 陈鹏万[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《工程力学》2010年第4期19-23,43,共6页Engineering Mechanics

摘　　要：在非连续变形分析(DDA)方法中研究并实现了叠加边界和粘性边界两种无反射边界条件,分别采用固定边界、叠加边界和粘性边界对一岩石细杆在飞块撞击下的动态响应进行了模拟。模拟结果表明:叠加边界和粘性边界都对反射应力波具有一定的衰减能力,但叠加边界的衰减能力更强,并且它对入射应力波的影响也比粘性边界小。Two non-reflecting boundary conditions including superposition boundary condition and viscous boundary condition are studied and implemented in Discontinuous Deformation Analysis （DDA） method. The dynamic response of a rock thin bar under the impact of a flying block is simulated, whose boundary condition is fixed, superposition and viscous respectively. Simulation result indicates that, both superposition boundary condition and viscous boundary condition can absorb the reflected stress wave to some extent. The absorbing ability of superposition boundary condition is better than that of viscous boundary condition. The incident stress wave may be less affected when superposition boundary condition is used.

关 键 词：DDA 动力学 无反射边界 粘性边界 叠加边界 

分 类 号：O347.3[理学—固体力学]