- Letter
- Open Access
Strain hardening by sediment transport
Phys. Rev. Research 4, L022055 – Published 8 June, 2022
DOI: https://doi.org/10.1103/PhysRevResearch.4.L022055
Abstract
The critical fluid-shear stress for the onset of sediment transport, , varies with the history of applied shear. This effect has been primarily attributed to compaction; the role of shear jamming is less explored. We examine the response of a granular bed to fluid-shear stress cycles of varying magnitude and direction, and determine isotropic and anisotropic contributions. Creep and bed-load transport result in direction-dependent strain hardening for . Dilation-induced weakening, and memory loss, occur for larger stresses that fluidize the bed. Our findings provide a granular explanation for the formation and breakup of hard-packed riverbed “armor.”
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Supplemental Material
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