Strain hardening by sediment transport

Author(s)

Cunez, Fernando D. ; Franklin, Erick M. ; Houssais, Morgane ; Arratia, Paulo ; Jerolmack, Douglas J.

• Document type: Journal article
• Source: PHYSICAL REVIEW RESEARCH; v. 4, n. 2, p. 6-pg., 2022-06-08.

Abstract

The critical fluid-shear stress for the onset of sediment transport, theta(c), 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 theta/theta(c) < 4. 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." (AU)

• FAPESP's process: 16/18189-0 - Liquid-fluidized beds in narrow pipes: dynamics and instabilities
• Grantee: Fernando David Cúñez Benalcázar
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/23838-3 - Bed load and creep flow within a bidisperse granular bed under laminar flow
• Grantee: Fernando David Cúñez Benalcázar
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 18/14981-7 - Modeling of dense granular flows: experiments, numerical simulations and stability analyses
• Grantee: Erick de Moraes Franklin
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2