计算力学学报Issue(5)：656-661,6.DOI:10.7511/jslx201505013
利用连接尺度方法的颗粒材料破碎数值分析
Numerical analysis of fragmentation of granular materials using bridging scale method
摘要
Abstract
Base on the existing bridging scale method(BSM)[1 ,2] proposed for granular materials,a version of BSM,taking into account the fragmentation of grains,is developed.A numerical model of fragmenta-tion of granular medium is introduced into the proposed BSM,in which the discrete particles assembly model using the discrete element method (DEM)and the Cosserat continuum model using the finite element method(FEM)are adopted in fine and coarse scales respectively.In the proposed BSM,the fine scale analysis using the DEM is limited to a localized computational domain for the simulation of mechanical behaviors in granular media at the meso-scale,including fragmentation of grains,along with frictional sliding and loss of contacts between each pair of immediate neighboring particles.Meanwhile, the FEM analysis that costs much less in both storage space and computational time than that of the DEM is applied to cover the whole computational domain.Furthermore,different time steps are allowed to the time integration schemes used for the fine and coarse scales respectively.As a consequence,both computational efficiency and accuracy of the present BSM is greatly enhanced.The numerical example is performed to demonstrate the applicability and advantages of the proposed BSM taking into account the fragmentation of grains,in addition,the effects of fragmentation of grains on the carrying capacity of geo-structure and the evolution of meso-structure.关键词
颗粒材料/颗粒破碎/有限元法/离散单元法/Cosserat 连续体/连接尺度方法Key words
granular material/particle crushing/finite element method/discrete element method/Cosserat continuum/bridging scale method分类
数理科学引用本文复制引用
王增会,李锡夔..利用连接尺度方法的颗粒材料破碎数值分析[J].计算力学学报,2015,(5):656-661,6.基金项目
国家自然科学基金(11372066) （11372066）
国家重点基础研究发展计划(2010CB731502)资助项目 （2010CB731502）
