Mechanical Mechanisms of Shear Dilatancy and Force Chain Evolution in Abrasive Polishing Granular Flow
The use of grinding and polishing as post processing can improve the surface quality of a workpiece.This paper mainly solves the problem of how to maximize the values of grinding and polishing processes.Since granular flow lubrication is suitable for extreme environment and environmental protection,the paper uses granular flow for grinding and polishing.A parallel plate model was established with the discrete element method.Granular flow was used as the third body to fill the gap between friction pairs,and the workpiece surface and tool were used as the first body to apply normal force and shear force to the granular flow system.The polishing process was numerically simulated.The results show that the shear dilatancy process of a single particle can be divided into rising stage,peak stage and falling stage.The weak chain direction in different stages is inclined to the x axis.In the rising stage,the weak chain direction is stable and can improve the machining efficiency and surface quality of the workpiece.When the load is large,the distribution law and the bearing rate of strong and weak force chains are stable.When the load is small,the shear dilatancy rate decreases and the strong chain direction is inclined to the x axis.This study numerically simulates the force chain and shear dilatancy that are not easily detected,thus providing a theoretical basis for the use of granular flow under the condition of grinding and polishing.
grinding and polishinggranular flowdiscrete element methodforce chainshear dilatancy
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