Studies on the Cultivating Action of Rotary Tines (1)

The Static Experiment of Pulverizing Action

Abstract

The author studied experimentally the pulverizing action by a rotary tine revolved slowly, and the pulverizing mechanics, the deformation of soil and the shape of slip line were observed in a small soil tank with a glass side window.
The results were obtained as follows:
(1) The pulverization by a ordinary tine is the ductile shear fracture, by a flat knife tine (Natatume) is the brittle tension and ductile shear fracture.
(2) The pulverization and the cultivating resistance are influenced by the form of tine.
(3) The shape of slip line in a part of circular arc and varies with the revolution of tine.
(4) The radius of the slip line is represented by S=R⋅cos(α-θ)/cos(φ+θ-α)