A DIMENSIONAL ANALYSIS OF THE PERFORMANCE OF PNEUMATIC TIRES ON SOFT SOILS.
Final technical rept.,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Treadless pneumatic tires were tested in specially prepared soft soils with a single-wheel dynamometer that was instrumented to measure horizontal and vertical forces, torque, slip, and sinkage. The test tires were of different sizes so that the effects on performance of tire width and diameter could be determined, and the tires were tested at three different degrees of tire deflection. The load on the tire was varied, but the speed of the test wheels was held constant. Two different soils were studied--a wet, frictionless clay and a dry, cohesionless sand. The soil strength was varied over the full practicable range, but with a minimum of variation within a test section. The cone penetrometer was used to measure the resistance of the soil in each case. The experimental results showed, both for the clay and the sand, that the cone penetrometer measurement was a satisfactory means of describing the consistency of the soil, and that true scaled systems could be achieved. The data also showed the influence of each of the independent parameters. A single term was developed for each of the soils that combined all of the independent parameters and this term was shown to be related to the dependent parameters.