METHOD OF DETERMINING COEFFICIENT OF STATIC FRICTION OF SURFACE LAYERS OF MATERIAL Russian patent published in 2025 - IPC G01N19/02 

FIELD: measuring.

SUBSTANCE: invention relates to investigation of physical and mechanical properties of materials and coatings, in particular to investigation of their tribological parameters. Hinge mechanism is installed on top of the sample located on the support surface, and the hinged support is installed in the vertical plane, they are connected by means of the first traction mechanism with length l₀. By means of the second traction mechanism, the length of which is l>l₀, a load is suspended on the hinged support, the weight m of which depends on the value of specific pressure, which must be created over the entire area S of the analysed surface of the sample. By means of the third traction mechanism made of material, the Poisson ratio of which is higher than that of traction mechanisms of length l₀ and l, created load is balanced. Pressure on sample from load is calculated by formula

where g is free fall acceleration, then external pressure P₁ is applied to the end surface of the sample in order to move it along the support surface, and as a result, using the values of pressures, the static friction coefficient is determined.

EFFECT: high accuracy of determining the rest friction coefficient of surface layers of the material and enabling direct determination of the friction coefficient at given contact pressures per sample.

1 cl, 1 dwg