PREDICTION OF THE SLOPE - CLIMBING CAPABILITY OF ELASTIC - RIM WHEELS
A NEW SEMIEMPIRICAL APPROACH WAS ATTEMPTED TO PREDICT THE SLOPE-CLIMBING CAPABILITY OF WHEELS. THIS APPROACH CONSISTED OF DETERMINING THE PULL PERFORMANCE OF FLEXIBLE WHEELS ON YIELDING SLOPES BY TWO EXTRAPOLATIONS: ONE STARTING FROM THE THEORETICALLY KNOWN PULL PERFORMANCE OF FLEXIBLE WHEELS ON UNYIELDING SLOPES, AND THE OTHER FROM EXPERIMENTALLY DETERMINED PERFORMANCE OF RIGID WHEELS ON YIELDING, LEVEL GROUND. THE RESULT IS A PREDICTION EQUATION FOR THE AVAILABLE PULL OF ELASTIC-RIM WHEELS (AS A PARTICULARLY SIMPLE CASE OF PNEUMATIC TIRES) ON DEFORMABLE, INCLINED SOILS IN TERMS OF SOIL DEFORMABILITY, COHESION, AND INTERNAL FRICTION; WHEEL FLEXIBILITY AND LOAD; AND SLOPE ANGLE. VARIOUS REDUCTION FACTORS DEVELOPED TO TAKE SINKAGE AND LOAD EFFECTS INTO ACCOUNT WERE ADJUSTED TO SATISFY KNOWN CONDITIONS AND TO MAKE THE TWO EXTRAPOLATIONS COMPATIBLE. BY SOLVING THE PREDICTION EQUATION FOR ZERO PULL, MAXIMUM SLOPE-CLIIMBING CAPABILITY CAN BE DETERMINED; AND BY SOLVING FOR ZERO SLOPE, THE MAXIMUM PULL/LOAD RATIO ON LEVEL GROUND CAN BE OBTAINED. ALTHOUGH THE EQUATION LACKS THEORETICAL RIGOR, IT MATCHES THE EXTREME CONDITIONS ON BOTH ENDS OF THE SOIL AND WHEEL DEFORMABILITY SPECTRA AND IS THOUGHT TO DESCRIBE INTERMEDIATE CONDITIONS WITH A HIGH DEGREE OF CONFIDENCE. THE EQUATION HAS BEEN CHECKED NUMERICALLY ONLY FOR THE TEST CONDITIONS PROVIDED BY ELASTIC-RIM WHEELS (BENDIX LUNAR WHEELS) BECAUSE THEY EXHIBITED THE SIMPLE DEFORMATION CHARACTERISTICS THAT WERE NEEDED FOR THIS FIRST FORMULATION OF A NEW APPROACH. THE MORE COMPLEX BEHAVIOR OF TIRES CAN BE INCLUDED IN AN EXTENSION OF THE STUDY. /AUTHOR/
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Supplemental Notes:
- Tech Rept M-71-6, 42 PP, 11 FIG, 8 REF
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Authors:
- Wiendieck, K W
- Publication Date: 1971-9
Media Info
Subject/Index Terms
- TRT Terms: Cohesion; Deformation; Equations; Forecasting; Internal friction; Slopes; Soils; Wheel loads; Wheels
- Uncontrolled Terms: Soil deformation
- Subject Areas: Geotechnology; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 00219448
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 7 1972 12:00AM