Experimental study and simulation analysis on friction behavior of a mechanical surface sliding on hard particles

Abstract

Considering the experimental research on a mechanical surface sliding on hard particles, a friction equipment has been designed and developed to study the frictional behavior between work piece surface and granular matter. Velocity, attack angle, surface morphology, and particle size are considered in our experiments. The measured shearing force and normal force, which are transmitted by the force chain, reveals the effect of these input parameters on force transmission behavior. Results show that a rougher surface and a smaller granular size decrease the measured forces. The effects of velocity and angle of attack are discussed as well. Force transmission is directly affected by the granule–granule contact in this friction pair. The friction coefficient is dependent on the friction angle of granules and may exceed 1 here. Based on the parameter selection of experiment, simulations have been conducted to verify the experimental results by discrete element method. In this article, the direct links between the experimental results and the optimization of granular lubrication are provided.

Keywords

Particulates surface sliding granular lubrication stress analysis

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