Main description (English)

Abstract: The article studies the coefficients of friction during sliding and at rest with a tendency to slide of wool-type fabrics - with different wool content, with different weave and with different thickness of the warp and weft threads. The aim of the study is to establish the trend of the graph of the coefficients of friction in relation to the pressure and in relation to the direction of testing - warp by warp and warp by weft for the two layers of frictional fabrics. The study shows that a logarithmic function - close to the linear or exponential - close to the linear function ideally describes the friction of wool-type fabrics. Out of a total of 16 graphs, 15 are ideally described by a logarithmic function, and 1 - by an exponential one, which can be summarized that the graphical dependence of the coefficients of friction for wool-type fabrics is logarithmic, as with increasing pressure, the coefficient of friction also increases. Twelve out of sixteen graphs are logarithmic with a high confidence coefficient R2 > 0.99. The values of the confidence coefficient R2, which are visible under the graphical equations in graphs Nos. 1 ÷ 16, characterize the approximation as a model with very good and ideal quality, with a confidence rate above 0.85. In the experimental study, results were obtained for friction coefficients (at rest and during sliding) close to 1 and even greater than 1. Keywords: Wool type fabrics, friction, coefficients of friction