Abstract
Silo-quake can be observed in granular bodies during silo emptying in the form of dynamic effects as pulsations or shocks. Measurements were carried out in full-scale aluminium silos containing potato powder and polymer granulates, and in a model perspex silo containing different fills to investigate this phenomenon. Theoretically, dynamic effects in silos were analysed with a finite element method developed in the frame of a polar (Cosserat) continuum using an elastoplastic and a hypoplastic approach. The onset of a dynamic silo flow with controlled and free outlet velocity in a plane strain model silo was simulated. A reliable, practical method to significantly reduce dynamic effects and to suppress resonance effects in mass flow during silo emptying was proposed. It was verified with experiments and FE-calculations.
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