Friction Coefficient of Oven-Dry Spruce Pine on Steel, as Related to Temperature and Wood Properties

Abstract

The coefficient of friction ranged from 0.10 to 0.25 and was negatively correlated with tempc~nture for tangential earlywood, tangential latewood, and radial surfaces pulled parallcl and perpendicular to the grain and for transverse surfaces pulled parallel and perpendicular to the annual rings.For transverse surfaces pulled parallel to the annual rings, tangential latewood surfaces pulled parallel or perpendicular to the grain, and tangential earlywood surfaces pulled parallel to the grain, the coefficient also increased with increasing extractive content for a given temperature.No significant relationships were detected between the coefficient and wood specific gravity after the effects of temperature and extractive content had been accounted for.