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| Considering the experimental research on a mechanical surface sliding on hard particles, we have designed and developed a friction equipment to study the frictional behavior between workpiece 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, attack angle are discussed as well. Force transmission is directly affected by 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 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. |
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| Keywords:Particulates; Solid Lubrication Friction; Friction Test Methods; Data Acquisition |
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