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WHEELS ON SOFT SOILS AN ANALYSIS OF EXISTING DATA.
Final technical rept., Sep 61-Aug 62,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Wheel performance data from almost 3000 tests are tabulated and analyzed. Principally these tests were conducted on two general soil groups that are termed frictional and nonfrictional. Rigid-tired and pneumatic-tired wheels are represented. The force required to tow transport wheels and the maximum pull developed by traction wheels are considered to be measures of performance. The data are analyzed to show the effects of load, tire geometry, and soil strength on wheel performance. Among the tire geometry variables examined are diameter, width, deflection, carcass construction, and tread pattern. It is shown that wheel performance varied systematically with the test variables. Much of this variation is described closely by mathematical expressions that are derived. In both soil groups load and soil strength always have an important influence on performance. In frictional soils tire diameter, width, and deflection are very influential while tread pattern and carcass construction are not. In nonfrictional soils tire diameter, width, and deflection have some influence and tread pattern can be very important under particular circumstances. Very little benefit is derived from dual tires and for traction on frictional soils duals are relatively inefficient. Author
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