The role of contact friction in the dynamic breakage behavior of granular materials

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• 作者：J. Huang (1)
  S. Xu (1) (2)
  S. Hu (1)
  
  1. CAS Key Laboratory for Mechanical Behavior and Design of Materials ; University of Science and Technology of China ; Hefei ; 230027 ; Anhui ; China
  2. School of Engineering and Science ; University of Science and Technology of China ; Hefei ; 230027 ; Anhui ; China
  
• 关键词：Granular material ; Particle breakage ; DEM ; Friction ; Non ; monotonic
• 刊名：Granular Matter
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：17
• 期：1
• 页码：111-120
• 全文大小：826 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Granular Media
  Industrial Chemistry and Chemical Engineering
  Engineering Fluid Dynamics
  Structural Foundations and Hydraulic Engineering
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-7636

文摘

Based on the discrete element method, a multi-scale model is employed to investigate the role of contact friction in the dynamic compression responses of brittle granular materials. Four numerical granular samples with different particle friction coefficients ranging from 0.0 to 2.0 are tested and the particle breakage extent is quantified with the Einav breakage index. It is observed that the relationship of the breakage extent with the axial stress is apparently non-monotonic concerning the particle friction coefficient. At the same stress level, the breakage extent exhibits a minimum when the particle friction coefficient is around 0.1 but increases significantly with the particle friction coefficient to both sides. The micro physical origin of this non-monotonic behavior is a distinct transition in dominant particle-breakage modes from tension to shear. Moreover, energy analyses also show non-monotonic evolution of the frictional and damping dissipation with the particle friction coefficient. The joint effect of these two dissipation terms contributes to the non-monotonic behavior of particle breakage. In addition, the accuracy and competence of two frequently-used micro quantities, fraction of sliding contacts and average coordination number, are discussed.