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Soil inertia in wheel-soil interaction
Journal of Terramechanics, 1973, Vol. 10, No. 3, pp. 5 to 7. Pergamon Press Printed in Great Britain.
SUMMARIES A Proposed Soil Classification System for Soil-Vehicle and Tillage Mechanics by S. J, CLARK. A soil classification system is proposed for use in tillage and soil-vehicle mechanics research that is a combination of the USDA Textural Classification system and the Unified Soil Classification system. In addition to the classification specification it is proposed that several soil values or relationships should be specified. These include shear strength parameters, Atterberg limits, dry density profiles, cone index vs depth plot, moisture content, liquidity index and clay activity, grain sizedistribution and void ratio. These values and relationships should be expressed as statistics with specified confidence limits. Scale-Model Tire Tests in Clay by G. D. SWANSON. Results of a study at the Waterways Experiment Station conducted with a scale-model (2.50-4) tire are reported. The first objective was to establish a level of performance for the 2.50-4 tire for several combinations of wheel load and tire deflection on a homogeneous soil at two strength levels. A base-line test series was conducted to establish this datum. This paper describes the base-line test equipment soil, procedures and results. The Simulation of Vehicle Performance in Surf II by J. DALZELL. This study is part of an overall program on the interpretation of performance tests of amphibious vehicles in surf. Part lI is a presentation of results of initial experiments on model surf generation at the Davidson Laboratory. Soil Inertia in Wheel-Soil Interaction by H. J. HOVLAND. A theory is developed, for a rigid cylindrical wheel, from which the influence of soil inertia forces acting on a wheel can be estimated. A concept of equivalent cohesion is introduced which allows a convenient experimental comparison for both cohesive and frictional soils. The theory compares favourably with previous analyses and experimental data. The study shows that soil inertia forces influencing the motion of a rolling wheel can be significant.
SUMMARIES A Proposed Soil Classification System for Soil-Vehicle and Tillage Mechanics by S. J, CLARK. A soil classification system is proposed for use in tillage and soil-vehicle mechanics research that is a combination of the USDA Textural Classification system and the Unified Soil Classification system. In addition to the classification specification it is proposed that several soil values or relationships should be specified. These include shear strength parameters, Atterberg limits, dry density profiles, cone index vs depth plot, moisture content, liquidity index and clay activity, grain sizedistribution and void ratio. These values and relationships should be expressed as statistics with specified confidence limits. Scale-Model Tire Tests in Clay by G. D. SWANSON. Results of a study at the Waterways Experiment Station conducted with a scale-model (2.50-4) tire are reported. The first objective was to establish a level of performance for the 2.50-4 tire for several combinations of wheel load and tire deflection on a homogeneous soil at two strength levels. A base-line test series was conducted to establish this datum. This paper describes the base-line test equipment soil, procedures and results. The Simulation of Vehicle Performance in Surf II by J. DALZELL. This study is part of an overall program on the interpretation of performance tests of amphibious vehicles in surf. Part lI is a presentation of results of initial experiments on model surf generation at the Davidson Laboratory. Soil Inertia in Wheel-Soil Interaction by H. J. HOVLAND. A theory is developed, for a rigid cylindrical wheel, from which the influence of soil inertia forces acting on a wheel can be estimated. A concept of equivalent cohesion is introduced which allows a convenient experimental comparison for both cohesive and frictional soils. The theory compares favourably with previous analyses and experimental data. The study shows that soil inertia forces influencing the motion of a rolling wheel can be significant.