Dynamic fluidization behavior has been generally identified as a result of irreversible grain sliding and dominates the strain time evolution in granular materials in presence of vibrations. From vibration-induced strain evolution
experiments performed in a triaxial configuration, we provide direct evidences that fluidity of granular packing is enhanced with vibration amplitude and frequency within low frequency dynamics. It is verified that a simple fluidity model based on standard Maxwell viscoelastic rheology can be used to account for the strain time
evolution in presence of low frequency vibrations. The proposed configuration reveals that the frequency has a completely contrary effect on aging and rejuvenation of the granular system comparing with vibration amplitude.Weakening of effective viscosity induced by increasing vibration amplitude and frequency is well elucidated by a statistical model, in which both parameters considering potential energy stored in the system and distribution of grain-contact orientations are introduced.
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