Gravitary Free Surface Flows Used as a Rheometrical Tool: The Case of Viscoplastic Fluids

Ghemmour, Assia; Chambon, Guillaume; Naaïm, Mohamed

doi:10.1063/1.2964460

Cited by 6 publications

(1 citation statement)

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“…We use Carbopol, an acrylate cross-polymer gel, as an analog material for investigating the impact of a discrete wing-crack set on creep dynamics. Carbopol has previously been applied as an analog for various geodynamic investigations including mid-crustal dynamics , the hydraulic properties of gravity-driven (Chambon et al, 2013;Ghemmour et al, 2008), and mantle dynamics (Balmforth and Rust, 2009;Davaille et al, 2013;Dubash and Frigaard, 2004;Massmeyer et al, 2013). In our experiments, we vary the strain rate and flaw length in a homogeneous layer of Carbopol.…”

Section: Experimental Methodsmentioning

confidence: 99%

Experimental analysis of semi-brittle deformation: Implications for deformation dynamics

Birren

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Faults can release energy via a variety of different slip mechanisms ranging from steady creep to fast and destructive earthquakes. Tying the rheology of the crust to various slip dynamics is important for our understanding of plate tectonics and earthquake generation. Here, we propose that the interplay of fractures and viscous flow leads to a spectrum between stick-slip and creep. We use an elasto-visco-plastic rock analog (Carbopol U-21) where we vary the yield stress to investigate its impact on slip dynamics in shear experiments. The experiments are performed using a simple shear apparatus, which provides distributed shear across the entire width of the experiment and allows in situ observations of deformation. We record force and displacement during deformation and use time lapse photography to document fracture development. A low yield stress (25 Pa) leads to creep dynamics in the absence of fractures. An intermediate yield stress (144 Pa) leads to the development and interaction of opening (mode I)and shear (mode II) fractures. This interaction leads to a spectrum in slip dynamics ranging from creep to stick-slip. A high yield stress (357 Pa) results in the development of many mode I fractures and a deformation signal dominated by stick-slip. These results show that bulk yield stress, fracture formation, and slip dynamics are closely linked and can lead to a continuum between creep and stick-slip. We suggest that rheology should be considered as an additional mechanism to explain the broad range of slip dynamics in natural faults.

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Section: Experimental Methodsmentioning

confidence: 99%

Experimental analysis of semi-brittle deformation: Implications for deformation dynamics

Birren

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Risk analysis of a dam rupture scenario on adjacent zones using ANSYS FLUENT: case study of Sélingué reservoir dam, Mali

Drame

Zhang

Wang

2020

Int. J. Environ. Sci. Technol.

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Obtaining flow curve for viscoplastic fluids through inclined open-channel apparatus

Sáo

Pereira

Fiorot

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Gravitary Free Surface Flows Used as a Rheometrical Tool: The Case of Viscoplastic Fluids

Cited by 6 publications

References 1 publication

Experimental analysis of semi-brittle deformation: Implications for deformation dynamics

Experimental analysis of semi-brittle deformation: Implications for deformation dynamics

Risk analysis of a dam rupture scenario on adjacent zones using ANSYS FLUENT: case study of Sélingué reservoir dam, Mali

Obtaining flow curve for viscoplastic fluids through inclined open-channel apparatus

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