琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
The traveling performance of a wheel depends on a deformation of soils beneath a wheel. In this paper, the deformation and its change accompanied with a rotation of the wheel are analyzed in case of the high slip (41%) on a ground of sand. The magnitude of soil deformation increased remarkably at immediately after the appearance of the maximum drawbar pull. Large displacement vectors concentrated in the zone beneath the wheel and in the rear of it. Typical distribution patterns of normal strains, a shear strain and a volumetric strain are illustrated by schematic graphs. The isobar of the null shear strain started from the slightly front position of the vertical center line of the wheel axle and inclined to backward when the wheel ratated. The zone of positive and negative tangential strain spread in the rear and the front, respectively, of the center line. There were remarkable differences of these distribution patterns before and after the appearance of the maximum drawbar pull.