Athermal granular creep in a quenched sandpile
arxiv(2024)
摘要
Creep is a generic descriptor of slow motions – in the context of materials,
it describes quasi-static deformation of a solid when subjected to stresses
below the global yield, at which all rigidity collapses and the material flows.
Here, we experimentally investigate creep, flow, and the transition between the
two states in a granular heap flow. Within the surface flowing layer the
dimensionless strain rate diminishes with depth, there is an absence of spatial
correlations, and there is no aging dynamics. Beneath this layer, the bulk
creeps via localized avalanches of plasticity, and there is significant aging.
The transition between fast surface flow and slow bulk creep and aging is
observed to be in the vicinity of a critical inertial number of I = 10^-5.
Surprisingly, at the cessation of surface flow and the `quenching' of the pile,
creep persists in the absence of the flowing layer; albeit with significant
differences for a pile that experiences a long duration of surface flow
(strongly annealed) and one where flow during preparation does not last long
(weakly annealed). Our results contribute to an emerging view of athermal
granular creep, showing similarities across dry and submerged systems. Quenched
quiescent heaps that creep indefinitely, however, present a challenge to
granular rheology, and open new possibilities for interpreting and casting
creep and deformation of soils in nature.
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