Grain Crush and Its Evolution in Granular Material: a Two-Dimensional Distinct Element Model Approach |
| |
引用本文: | 王宝善,施行觉,陈颙,葛洪魁,黄庭芳.Grain Crush and Its Evolution in Granular Material: a Two-Dimensional Distinct Element Model Approach[J].中国物理快报,2004,21(8):1651-1654. |
| |
作者姓名: | 王宝善 施行觉 陈颙 葛洪魁 黄庭芳 |
| |
作者单位: | [1]SchoolofEarthandSpaceScience,UniversityofScienceandTechnologyofChina,Hefei230026 [2]InstituteofGeophysics,ChinaEarthquakeAdministration,Beijing100081 [3]DepartmentofGeosciences,StateUniversityofNewYorkatStonyBrook,StonyBrookNY11794-2100,USA |
| |
摘 要: | A crush criterion and a simplified post-crush process for spherical grains are introduced into the traditional distinct element model (DEM). The crush criterion is based on Herzian comtact, and it indicates a negative relation between critical force Fcr and radius R via Fcr ∝ R^-3/2. Effects of grain crush on deformation pattern and statistical features of crush evolution for samples under uniaxial strain load are intensively investigated. Influences of maximum crush times and particle size distribution (PSD) are also discussed. It is found that: (1) Grain crush will blur the localization of deformation. (2) Crush is prone to occur in larger grains, due to force concentration and lower critical force Fcr for larger grains. (3) Grain crush only temporarily reduces contact force, which results in the most rapid increase of the number of grains with maximum crush time.
|
关 键 词: | 颗粒材料 颗粒粉碎 DEM模型 粉碎标准 材料力学 |
本文献已被 维普 等数据库收录! |
|