A QUALITATIVE APPROACH TO THE PNEUMATIC TIRE-SOFT SOIL SYSTEM

THIS STUDY WAS DIRECTED TOWARD OBTAINING A FUNDAMENTAL UNDERSTANDING OF THE TIRE-SOIL SYSTEM FROM A QUALITATIVE INVESTIGATION OF THE BEHAVIOR OF PNEUMATIC TIRES OPERATING IN SOFT SOILS, USING FAILURE THEORIES OF CLASSICAL SOIL MECHANICS. A SERIES OF POWERED-WHEEL, PROGRAMMED-SLIP PERFORMANCE TESTS CONDUCTED IN SAND AND CLAY WERE ANALYZED. THE SOIL IN CONTACT WITH THE TIRE IS CONSIDERED TO BE IN A STATE OF FAILURE AT ALL SLIPS, AND IT IS HYPOTHESIZED THAT THE CHARACTERISTIC SHAPE OF THE PULL-SLIP CURVE IS NOT DUE TO THE INCREASE ON SOIL DEFORMATION, BUT TO THE ROTATION OF THE FAILURE PLANE WITH RESPECT TO THE TIRE-SOIL INTERFACE. USING SOME SIMPLE ASSUMPTIONS AND THE APPROXIMATION THAT MEASURED FORCES WERE UNIFORMLY DISTRIBUTED OVER THE TIRE- SOIL CONTACT SURFACE, IT IS DEMONSTRATED THAT THE HYPOTHESIS IS A PLAUSIBLE ONE. A KEY ELEMENT IN THE ANALYSIS IS THE DETERMINATION OF THE ANGLE OF A TIRE CONTACT SURFACE RELATIVE TO THE HORIZONTAL. USING THIS ANGLE AND THE FORCES MEASURED IN A TEST, A RELATION BETWEEN THE RATIO OF TANGENTIAL AND NORMAL STRESSES AND SLIP WAS DEVELOPED. THIS RELATION IS INTERPRETED AS A MEASURE OF THE ROTATION OF THE FAILURE PLANE. THERE APPEARS TO BE A LINEAR RELATION BETWEEN THIS ANGLE AND SLIP IN SAND, AND A HYPERBOLIC RELATION IN CLAY. /AUTHOR/

  • Supplemental Notes:
    • No 4-944, IX + 28 PP, 13 FIG, 2 TAB, 10 REF, 1 APP
  • Authors:
    • Kraft, L M
  • Publication Date: 1967-11

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  • Accession Number: 00234290
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 6 1994 12:00AM