DEM Analyses of Shear Band in Granular Materials
Shear-induced strain localization in granular materials has been a hot topic under intensive research during the last four decades.However, the micromechanical process and mechanisms underlying the initiation and development of shear bands are still not fully understood.This deficiency hinders the development of robust micromechanics-based constitutive models.This paper carries out a further study on this topic through a series of two-dimensional distinct element method (DEM) simulations.Various global and local micromechanical quantities particular the energy dissipation and local stress and strain invariants are newly examined with a special emphasis on the initiation and propagation of shear bands.Novel findings of the relationship between sliding and rolling dissipation band and shear band are achieved, indicating a plastic dissipation nature for the shear band.Moreover, the effects of various influential variables including initial void ratio, confining stress, interparticle friction coefficient,rolling resistance coefficient, specimen slenderness and strain rate on the pattern, scope and degree of shear bands are investigated.The high interparticle sliding or rolling resistance, relative small initial void ratio, relative low confining stress and high strain rate facilitate the formation of shear band.In addition, the strain rate affects the pattern of the shear bands.
strain localization shear band rolling resistance energy dissipation Distinct Element Method
Jiang Ming-Jing Zhang Wang-Cheng Wang Jian-Feng
Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineerin Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong, China
国内会议
大连
英文
86-102
2012-09-01（万方平台首次上网日期，不代表论文的发表时间）