Abstract
ABSTRACT DIRECT shear tests were performed to study fric-tional behavior of wheat on aluminum, galvanized steel, plywood and concrete. The results showed that the conventional coefficient of friction concept defines the upper bound of tangential force along the contacting surfaces. The magnitude of tangential force is dependent on both the normal force and relative displacement between grain and structural material surfaces. An exponential function was proposed to model the wheat-structural material frictional behavior. Tests were performed to determine the frictional behavior of 10.2% moisture content (w.b.) wheat on four structural materials. Model simulations compare favorably with test data. The average relative differences between model simulations and experimental data are 15.96%, 9.76%, 11.78% and 9.54% for wheat-aluminum, wheat-galvanized steel, wheat-plywood and wheat-concrete interfaces.
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