Measurement and Analysis of Six Direction Stresses under Tractor Tire

Abstract

A transducer was developed to determine the stress state in the soil on a hard pan. Principal stresses, octahedral normal and shearing stresses can be calculated from the data measured with six pressure cells on the transducer in the six predetermined directions. The transducer was buried in three locations in the soil at 25cm depth: under the lug at the centerline and the edge of the tire and under the undertread at the edge of the tire. The effect of changes in the locations of buried transducer on soil stresses indicated that the maximum major principal stress under the lug at the centerline of the tire in was more than twice as those in other locations.