Analysis of the Mechanism of Soil Cutting : 3rd Report. Distribution of Stresses on Cutting Blade and Cutting Force

Abstract

Distribution of stresses on cutting blade and cutting force in soil cutting are analyzed by experiment. The variable parameters are the kinds of soils (dry quartz sand and plastic loam) and the cutting conditions (cutting angle, depth of cut and cutting speed). Stresses are measured by miniature pressure cells and friction cells which have been developed by authors. In sand cutting, the pressure p and the frictional stress f on the cutting blade both increase in proportion to the depth, and the relation f=up is always valid between p and f. In loam cutting, pressures change according to the cutting conditions, but frictional stresses are always distributed uniformly on the cutting blade regardless of the cutting conditions. Moreover, the relations between cutting-force-application point and the cutting conditions are analyzed. Important things for earth-moving machines are explained from the results of these experiments.