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A micromechanics model for predicting dynamic loads during discharge in bulk solids storage structures Q. Zhang and M.G. Britton Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba, Canada R3T 5V6 . Zhang, Q. and Britton, M.G. 2003. A micromechanics model for apparent that the frictional behaviour of bulk solids is the key to predicting dynamic loads during discharge in bulk solids storage understanding dynamic loads. Of the above mentioned three structures. Canadian Biosystems Engineering/Le génie des hypotheses, the dilation hypothesis is founded on a fundamental biosystèmes au Canada 45: 5.21 - 5.27. A two-dimensional micro- frictional characteristic of bulk solids -- dilatancy. structure mechanics model has been developed for predicting dynamic pressures during discharge in bulk solids storage bins. The model It is a well known fact that particulate materials generally assumes that the bulk solids consist of elastic discs of equal size and dilate when subjected to shearing because of interlocking dynamic lateral pressures on the bin walls are induced by dilation of between particles (Das 1983). When bulk solids are discharged the stored bulk solids. Dilation during discharge is calculated from the from storage bins shearing occurs in the mass of stored materials change in the microscopic structure of bulk solids. A micromechanics causing bulk solids to dilate. However, dilation is restricted by theory is used to transfer microscopic dilation to macroscopic stresses, bin walls, and consequently loads on bin walls increase. Various or dynamic pressures, on the bin walls. Predicted dynamic pressures dilat