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Date of Publication:2022-10-09
Journal:中国科学 物理学 力学 天文学
Affiliation of Author(s):运载工程与力学学部
Volume:41
Issue:9
Page Number:1112-1125
ISSN No.:1674-7275
Abstract: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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