Abstract
Prediction of traction and compaction in the soil profile based upon two-dimensional (2D) and three-dimensional (3D) representations of the dynamic soil-tyre contact area and an assumed pressure distribution over the profile are presented for two tyre sizes at two inflation pressures, two levels of dynamic load and two slip levels in a tilled Yolo Loam soil condition. A soil model based upon a semi-logarithmic porosity-stress relationship was used to obtain the pressure distribution. Traction predictions based upon the 3D surface were significantly better than those based upon the 2D surface. Compaction predictions were similar for both surfaces except for immediately below the soil surface.
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