An ellipse-based Discrete Element Method (DEM) numerical computer code is validated by simulating experimental shear tests on systems of photoelastic rods with circular cross sections. Initial test simulations were performed using the starting positions of the photoelastic particles with ideal, or assumed boundary conditions and particle diameters. Results of the initial test simulations show good agreement with the global behavior of the physical tests including sample shear strength and particle kinematics. Somewhat less agreement is observed in the inter-particle contact force and inclination angles (micro-level response). Small changes to the wall positions and particle diameters were introduced to the DEM sample in all attempt to increase the accuracy of the shear test simulations. Results of the simulations with both modified wall positions and a normal distribution consisting of five particle diameters show excellent agreement in both the global and micro-level response.; The DEM numerical model was then applied to the investigation of the pressures and flow patterns of granular materials within static and discharging storage silo structures. (Abstract shortened by UMI.)
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