Abstract
Abstract : Tests were conducted with one wheeled vehicle to determine effects of soil surface conditions on drawbar pull and to relate optimum drawbar pull to soil strength as measured by a number of instruments. One hundred and six drawbar pull-slip tests were conducted with an M37 3/4-ton truck at a gross weight of 7240 lb. One tire size (9.00-16, 8-PR), two tread patterns (smooth and nondirectional military), and two tire deflections (15% and 35%) were tested. Surface conditions varied from dry and firm to wetted with small amounts of water to flooded. Asphalt surfaces also were tested. Measurements of soil strength were made with the standard cone penetrometer, multiprobe penetrometer, sheargraph, soil truss, and friction wheel. Analysis of data indicated that the multiprobe penetrometer and sheargraph show the most promise as instruments for measuring surface conditions and predicting vehicle performance. Equations were developed for predicting drawbar pull based on deflection and soil measurements with the sheargraph and multiprobe penetrometer.
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