Abstract
ABSTRACT MEASUREMENT of the tangential stress distribution at the soil-wheel interface is necessary for study of the factors influencing the tractive effort developed by a wheel. The split wheel technique for measurement of tangential stress at the interface of a rigid, smooth wheel in soil was re-ported by Burt and Schafer (1972). Since that report the split wheel technique has been used successfully at the National Tillage Machinery Laboratory (NTML) in several studies (Burt and Bailey, 1974; Bailey, Burt and Taylor 1975) and a study not yet published. This paper reports the concepts that were developed for ex-tension of the split wheel technique for lugged wheels and for comparison of wheel surfaces. Since 1972 the analog data process-ing described by Burt and Schafer (1972) has been eliminated and the data are now analyzed with an on-line digital computer system. The use of the digital system facilitates data manipulation, and the information gained from the digital analysis is much improved. Details of the digital analysis can be requested from the NTML.
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