Sliding friction of shale rock on dry quartz sand particles

• Published in: Friction Vol. 7; no. 4; pp. 307 - 315
• Main Authors: Zhang, Huijie, Liu, Shuhai, Xiao, Huaping
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.08.2019; Springer Nature B.V; SpringerOpen
• Subjects: Coefficient of friction; Contact stresses; Corrosion and Coatings; Engineering; frictional performance; Hydraulic fracturing; Industrial applications; Mechanical Engineering; Nanotechnology; Physical Chemistry; Quartz; quartz sand; Research Article; Sand; Sand & gravel; Seismic engineering; shale rock; Sliding friction; Surfaces and Interfaces; Thin Films; Tribology; Ultrasonic testing; hydraulic fracturing; frictional performance; quartz sand; shale rock
• ISSN: 2223-7690; 2223-7704
• DOI: 10.1007/s40544-018-0213-y

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.