A rate- and state-dependent ductile flow law of polycrystalline halite under large shear strain and implications for transition to brittle deformation
- Creators
- Noda, Hiroyuki
- Shimamoto, Toshihiko
Abstract
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.
Additional Information
© 2010 American Geophysical Union. Received 13 January 2010; accepted 5 April 2010; published 15 May 2010. We gratefully appreciate the grammatical check by Tom Mitchell, and comments by Masao Nakatani which improved the manuscript.Attached Files
Published - Noda2010p10155Geophys_Res_Lett.pdf
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Additional details
- Eprint ID
- 18555
- Resolver ID
- CaltechAUTHORS:20100603-152442134
- Created
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2010-06-18Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field