Normal and Shear Stress Distribution Under a Rigid Wheel in Dry Sand
STEVENS INST OF TECH HOBOKEN NJ DAVIDSON LAB
Pagination or Media Count:
A very sensitive transducer was developed in order to measure the normal pressure and the shear stresses simultaneously on the rim of a rigid wheel moving in fine sand. Four of these transducers were installed across the wheel width to measure the lateral stress distribution as well. A series of tests were conducted for a driven wheel on soft sand. The tests were performed at both positive and negative slip rates. For each slip rate, the wheel load, the wheel sinkage, the torque due to the soil on the wheel rim, and the stress distribution in the soil were measured and recorded. In order to validate the results, the recorded stresses were integrated to yield the forces and moments acting on the wheel-soil interface. These forces and moments were then compared to the actual measured forces and torque. The measured stress distribution was compared to calculated stresses using Bekkers and Selas equations for pressure sinkage relationships.
- Soil Mechanics
- Surface Transportation and Equipment