Abstract
The sliding friction of rock, involving all kinds of particles at the contact surface, is relevant to many problems, ranging from those in artificial engineering to earthquake dynamics. In this work, the frictional performance of the shale rock–dry quartz sand contact was investigated using a self-developed testing device. The study showed that the coefficient of friction of the contact increases with nominal stress and that the corresponding friction force increases approximately linearly with nominal stress, which is directly related to the contact stress between each single sand particle and rock shale. An overall dynamic coefficient, γ, reflecting the response of friction force to nominal stress, first decreases and then increases with area ratio, which is determined by not only the contact stress but also the interparticle friction force. These have important repercussions for a preliminary understanding of the frictional properties of the shale rock–dry quartz sand contact in hydraulic fracturing and related industrial applications.
Highlights
Sliding friction of rock is relevant for many problems ranging from artificial engineering to earthquake dynamics [1]
The goal of this study was to research the frictional behavior of the shale rock–dry quartz sand contact and present a possible explanation for the results obtained, which would provide a preliminary understanding of the shale rock–dry quartz sand contact
The surface roughness of the cleaned shale rock measured by the surface profilometer was 11.47 ± 2.28 μm
Summary
Sliding friction of rock is relevant for many problems ranging from artificial engineering to earthquake dynamics [1]. In many practical situations, such as drilling, mining processes, or rock processing, rock is commonly mated with metal/ceramic or other artificial materials [2]. Both the contact surfaces are rock in earthquake or other natural processes of rock movement, which are part of the green tribology [3]. The particle size distribution and inter-particle friction influence the nature of deformation and mechanical behavior of granular fault gouges [15, 16]
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