Tribological Characteristics between Snow and Steel and in Snow - Development of Annular Shearing Type Experimental Analysis System -

Abstract

Characteristics of friction and adhesion/cohesion between snow and SS400 steel in a shearing velocity range of 2.5-25.4 m/s, as well as in snow itself in a shearing velocity range of 0.5-2.5 m/s, were analyzed by using a specially developed annular shearing type experimental analysis system in a normal stress range of 20-60 kPa. The friction coefficient between melt forms and SS400 was smaller than that between rounded grains and SS400 at the same shearing velocity. The adhesive force per unit area of the rounded grains and the melt forms with respect to SS400 and the cohesive forces per unit area in the rounded grains and the melt forms tended to be larger with smaller shearing velocity in the transient state, whereas those in the steady state showed the opposite tendency, except for the adhesive force of the melt forms in the transient state and that of the rounded grains in the steady state in the case where the shearing velocity was 25.4 m/s. In addition, the friction coefficients in the rounded grains and the melt forms were larger with decreasing shearing velocity.

Keywords

• tribology
• snow
• friction
• adhesion
• cohesion
• steel
• high pressure
• high shearing velocity