An experimental study on global contact stiffness of sandy particle layers under high loads in three-body contact Online publication date: Tue, 20-Aug-2024
by The Yen Doan
International Journal of Abrasive Technology (IJAT), Vol. 12, No. 2, 2024
Abstract: In this work, the stress-strain behaviour of particle layers, namely, global contact stiffness is investigated by a series of uniaxial compressing tests. In our experiment, one up to three layers of quartz sand grade HB 34 are pressed between a block of steel and a rotating steel disk with the applied load varying from 0.03 kN up to 20 kN. The stiffness of abrasive layers depends on different parameters such as the applied loads, the thickness of the layers and the loading-unloading process. The dependency of the contact stiffness on normal loads and on different compression test conditions is studied. Based on the global stiffness of the particle layer, the local contact pressure in the contact zone can be estimated. We have built a uniaxial spindle tester and carried out various experiments. Accordingly, some mathematical expressions of contact stiffness in terms of applied loads in the loading, and unloading processes, were derived by regression algorithms.
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