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发表时间：2022-10-09

发表刊物：中国科学 物理学 力学 天文学

所属单位：运载工程与力学学部

卷号：41

期号：9

页面范围：1112-1125

ISSN号：1674-7275

摘要：The quasi-solid-liquid phase transition of granular materials exists
   wildly in the fields of engineering geology,nature environments and
   industry production,etc.The mechanical properties of granular system are
   quite different during the phase transition,which has been the hot and
   difficult problem in granular mechanics recently.With the mechanical
   behaviors investigation of granular quasi-solid-liquid transition,the
   phase diagram can be established to determine the transition conditions
   and to understand the transition mechanism.The quasi-solid-liquid phase
   transition can be divided in the two kinds following.The one is the
   transition between jamming and unjamming,and the other one is the
   transition between solid phase and liquid phase under flow
   conditions.According to the second phase transition,the simple shear
   flow of polydispersed granular materials with periodic boundary are
   simulated numerically with discrete element method(DEM).The macro
   parameters,such as averaged stress,coordination number,contact time
   number,effective friction coefficient,inertia number and generalized
   Savage number etc.,are discussed to understand the intrinsic mechanism
   of quasi-solid-liquid phase transition under various volume fractions
   and shear rates.Finally,the e-tau-B phase transition diagram is
   established with the three basic parameters of porosity,dimensionless
   shear rate and macro shear stress.

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