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| Authors: | M. Molenda1, J. Horabik1, I. Ross2 1Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland 2Biosystems and Agricultural Engineering Department, University of Kentucky, 128 Agricultural Engineering Bldg. Lexington, Kentucky 40546-0276, U.S.A. |
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| Abstract : | Abstract. A method was developed and a device constructed to measure the force of internal friction of granular materials. The angle of internal friction of wheat grain was determined for two displacement speeds (0.5 and 5 mm/min) in the normal pressure range from 2.8 to 48 kPa. The angle of internal friction was found to de-crease with an increase in normal pressure. Slip-stick behaviour was observed when the shearing speed equaled 0.5 mm/min. With an increase in displacement the deformation is localised in a shear zone. The thickness of the shear zone stabilised soon after the shear stress reached maximum value. |
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| Keywords : | wheat, friction, direct shear test | ||||||||
| Language : | English | ||||||||