摘要
The quasi-solid-fluid phase transition of granular materials is closely related to the shear rate and solid concentration in addition to their intrinsic properties. The contact duration and the coordination number are two important temporal-spatial parame-ters to describe the granular interaction in phase transition. In this study, characteristics of the contact duration and the coordination number associated with the transition processes are determined using a 3D discrete element model under different shear rates and concentrations. The resulting macroscopic stress and strain-rate relations are discussed. The temporal and spatial parameters provide a linkage between the macroscopic constitutive law and inter- particle micromechanics.
The quasi-solid-fluid phase transition of granular materials is closely related to the shear rate and solid concentration in addition to their intrinsic properties. The contact duration and the coordination number are two important temporal-spatial parame- ters to describe the granular interaction in phase transition. In this study, characteristics of the contact duration and the coordination number associated with the transition processes 3D discrete element mode are determined using a under different shear rates and concentrations. The resulting macroscopic stress and strain-rate relations are discussed. The temporal and spatial parameters provide a linkage between the macroscopic constitutive law and interparticle micromechanics.
关键词
颗粒材料
粒状流动力学
准固-液相变
时空参数
granular flow dynamics, quasi-solid-fluid phase transition, coordination number, contact duration, macro-stress.
