Abstract
A stress analysis in the draw- bar during the tillage operation in two different types of soils and speeds has been carried out. The analysis of the soil types was conducted in the laboratory of Civil Engineering, University of Mosul. This analysis revealed two types of soils : clay and mixed, The material of the draw-bar and its mechanical properties were obtained. Then the stresses generated in small scale modelwere obtained using the finite element analysis using the “Ansys Release 14.0” program.Three dimensional stresses together with the equivalent Von-Mises and principal stresses have been obtained. The percentage deformation in the x,y and z direction were also obtained. During the operational stage, the stresses were measured using a number of electrical resistance strain gauges type PL-15-11 fixed on both sides of the draw-bar while the tractor was driven in two different soils at varies speeds (2.39, 3.37, 6.35) km/h. It was observed that the stresses were higher in clay soil more than those in a mixed soil due to the different composition in soil this will create different resistance in both types of soil . It was also observed that stresses increased with increasing speeds due to increase in momentum
