METHOD FOR DETERMINATION OF FRICTION COEFFICIENTS OF REST AND SLIDING Russian patent published in 2020 - IPC G01N19/02 

FIELD: test technology.

SUBSTANCE: invention relates to mechanical testing of materials, in particular, for determination of coefficient of sliding friction during mutual movement of samples. One of the samples is made with rectilinear working surface and fixed, movable sample is installed on working surface of fixed sample with possibility of sliding along it, to movable sample is pivotally connected rod, which second end is also pivotally connected to traction mechanism, capable with necessary force to move connected to it end of traction in direction perpendicular to direction of relative movement of movable sample. Moving the sample relatively to the stationary one by the small steps, gradually increasing the angle ϕ inclination of thrust relative to direction of movement of traction mechanism, after each step removal of force applied for shift of moving specimen and determining maximum value of inclination angle of rod ϕ_st, after which next shift of movable sample is accompanied by its sliding in reverse direction, inclination angle of draft is measured ϕ_sl, at which reverse sliding of movable sample is stopped, by value of angle ϕ_st determine the coefficient of static friction ƒ_st=tgϕ_st, and from angle value ϕ_sl is friction coefficient of sliding ƒ_sl=tgϕ_sl.

EFFECT: ability to determine the slip friction coefficients at any contact pressures, without measuring the friction force, based on the results of measuring the geometrical parameters of the system.

1 cl, 2 dwg