A rate- and state-dependent ductile flow law of polycrystalline halite under large shear strain and implications for transition to brittle deformation

Details A rate- and state-dependent ductile flow law of polycrystalline halite under large shear strain and implications for transition to brittle deformation A rate- and state-dependent ductile flow law of polycrystalline halite under large shear strain and implications for transition to brittle deformation

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709310n&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 9, CiteID L09310

Physics

2

Structural Geology: Rheology: Crust And Lithosphere (8159), Structural Geology: Rheology And Friction Of Fault Zones (8163), Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Plasticity, Diffusion, And Creep

Scientific paper

We have conducted double-shear biaxial deformation experiments in layers of NaCl within its fully-plastic (FP) regime up to large shear strains (γ < 50) with velocity steps. From this, we have empirically formulated a rate- and state-dependent flow law which explains the transient mechanical behavior. The steady state flow stress in the FP regime can be explained by a power-law with a stress exponent ˜8.5 and an activation enthalpy of ˜1.3 eV, with the instantaneous response having a higher stress exponent (13 ± 8), although there is data scatter. The transition to brittle regime is associated with weakening from the ductile flow law. In FP regime, the mechanical response is characterized by a monotonic decay to a new steady state while in the transitional regime, by a peak-decay behavior. The transient flow law obtained here is of considerable importance in the study of the brittle-ductile transition in rocks.

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