摘要
基于颗粒离散元法对二维颗粒体进行了双轴压缩数值模拟.将离散系统中的变形与连续体中相应的变形联系起来,应用于颗粒离散元方法中平均应力的计算,比较了不同颗粒形状、颗粒间摩擦系数对颗粒体的微观-宏观力学性能的影响,并分别考虑了不同摩擦系数下,颗粒颗粒间接触力的法向分量和切向分量对剪切应力的贡献.本文的计算结果表明颗粒的形状和表面性质对颗粒体的力学性能有显著的影响.
Quasi-static shear deformation of two-dimensional granular arrays is carried out by using discrete element method （DEM）. Macro average stress in the granular assembly is computed based on the linkage between the discrete force system and its continuum equivalent. The contributions of the normal and tangential contact force to the stress tensor are considered respectively. The inter-particle coefficient and the particle shape on the microscopic and macroscopic responses are discussed. The simulation results show that the mechanical properties of granular assemblies are significantly influenced by the shapes and surface characteristies of the individual particles.
出处
《大连大学学报》
2007年第6期27-31,共5页
Journal of Dalian University
关键词
颗粒材料
形状影响
表面性质
离散元
细观参数
granular materials
shape effect
surface characteristic
discrete element method
microscopic parameters
