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Solid Earth An interactive open-access journal of the European Geosciences Union

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doi:10.5194/se-2017-24
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
17 Mar 2017
Review status
This discussion paper is under review for the journal Solid Earth (SE).
Strain heterogeneities at the ductile to brittle transition; a case study on ice
Thomas Chauve1, Maurine Montagnat1, Cédric Lachaud1, David Georges1, and Pierre Vacher2 1IGE, Université Grenoble Alpes / CNRS F-38041 Grenoble, France
2Laboratoire SYMME, Université de Savoie Mont Blanc, BP 80439, 74944 Annecy le Vieux Cedex, France
Abstract. This paper presents, for the first time, the evolution of local strain fields around intragranular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by Digital Image Correlation indirectly shows the redistribution of stresses during crack opening, but also driven by crack tip plasticity mechanisms and recrystallization. Such redistribution induces modifications in the local strain deformation bands, and crack closure during deformation. A strong interaction between cracking and dynamic recrystallization is therefore evidenced at the ductile to brittle transition in ice deformed at high homologous temperature.

Citation: Chauve, T., Montagnat, M., Lachaud, C., Georges, D., and Vacher, P.: Strain heterogeneities at the ductile to brittle transition; a case study on ice, Solid Earth Discuss., doi:10.5194/se-2017-24, in review, 2017.
Thomas Chauve et al.
Thomas Chauve et al.
Thomas Chauve et al.

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Short summary
For the first time, Digital Image Correlation was used to follow strain field development during micro cracking, at the ductile to brittle transition in polycrystalline ice. Owing to the high temperature conditions of the tests, dynamic recrystallization mechanisms (nucleation and sub-grain rotation) efficiently participate to the stress redistribution during and after crack opening, and even lead to local crack closure.
For the first time, Digital Image Correlation was used to follow strain field development during...
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