METHOD FOR DETERMINING COEFFICIENTS OF FRICTION Russian patent published in 2021 - IPC G01N19/02 

FIELD: material testing.

SUBSTANCE: invention relates to the field of mechanical testing of materials. Essence: the lower sample is made with a straight working surface, a flat stop is installed perpendicular to the working surface of the lower sample, the upper sample is made in the form of a cylindrical rod, it is provided with the possibility of rotation around the axis and horizontally installed on the working surface of the lower sample perpendicular to its axis. The necessary pressure on the contact area of the samples is created by loading the cylindrical sample with a vertically directed force P, distributed into two identical components applied symmetrically relative to the lower sample from its opposite sides. It is possible to rotate the lower sample together with the stop relative to the axis of the cylindrical sample to form an angle of inclination ϕ of the working surface of the lower sample relative to the horizon. The coefficients of friction are determined by the magnitude of the angle of inclination ϕ, the correspondence of which to the angle of friction of rest or sliding between the samples is determined by the occurrence or termination of contact between the cylindrical sample and the stop in the process of changing the angle of inclination ϕ.

EFFECT: possibility to determine the coefficients of sliding and resting friction at any contact pressures, without measuring the friction force, based on the results of measuring the geometric parameters of the system.

5 cl, 2 dwg