| In order to account for the interaction of first body deformation and third bodyrheology in the three-bodies tribological interface, FEM and DEM are used respectively tomodel the first body and the third body, and a stress-strain transmission mechanism isestablished to ensure that the first body and the third body can provide boundary conditionsfor each other. ANSYS/LSDYNA and PFC2d are adopted and through secondarydevelopment, effective data delivery and orderly circular computation between them areachieved. Through this multi-scale method, the shear process of two parallel plates, betweenwhich are full of solid particles are researched. The model has two subregions:the FEMregion (upper body) and the DEM one (third body and lower body). The third body iscompressed by the upper body with a certain pressure while it is sheared by the lower bodyat a constant velocity. This paper mainly focuses on the energy dissipation, global frictioncoefficient, clearance characteristic, stress distribution and the state of the third body underdifferent pressure, shearing speeds, elastic modulus and particle sizes. The results show that without the influence of adhesion among particles, the energyinput throuth the upper and lower bodies is mainly dissipated by the action of frictionamong particles and the system follows the law of energy conservation. The meandimensionless stress in the third body and the global friction coefficient increase because ofstrong collisions among particles under low pressures. Meanwhile, the stress profiles in theFEM regions correspond to the force chain distributions in the DEM regions. During theshear process, the particle contact distributions in the third body are regular:the strongcontacts between particles appear more from0to90°, especially from54°to72°. A largequantity of particle contacts concentrate when the contact force is about0～0.6times themean contact force of the third body, and then the larger the contact force, the less theparticle contacts. |
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