Abstract
Experiments were conducted to determine the nature of the stress field and the 2-dimensional deformation pattern generated in front of model rectangular tillage tools at different moisture levels of the experimental clay soil. Stress in soil was sensed by diaphragm-type transducers and recorded by photographing the liquid level in the indicator tubes of the manometer-type transducers. The variation of stress with the distances along the 3 co-ordinate axes was determined and the empirical relationship arrived at was found to represent a quadric surface. The stress field was found to be a regular surface of revolution unlike the one predicted by the existing theory, wherein its section is a composite of a logarithmic spiral and a straight line. The angle of intersection of the failure surface with the horizontal surface was found to be different from 45-θ/2 except in a few cases. The 0.20-m wide tool was found to give the minimum draft per unit width of the cutting edge.
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