%0 Journal Article
%T Stress and deformation of wheat in direct shear test
%A Molenda M.
%A Horabik J.
%A Ross J.
%J International Agrophysics
%D 1998
%I 
%X 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 decrease 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.
%K wheat
%K friction
%K direct shear test
%U http://www.international-agrophysics.org/artykuly/international_agrophysics/IntAgr_1998_12_2_115.pdf