Experimental characterization of the intragranular strain field in columnar ice during transient creep

Grennerat, Fanny; Montagnat, Mâurine; Castelnau, Olivier; Vacher, Pierre; Moulinec, Hervé; Suquet, Pierre; Duval, Paul

doi:10.1016/j.actamat.2012.03.025

Cited by 80 publications

(134 citation statements)

References 53 publications

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“…4 via the equivalent strain ε eq at two different spatial resolutions in order to illustrate the structure of strain heterogeneities. Similarly to what was already observed by Grennerat et al (2012), the deformation is organized into bands crossing most of the sample. The main orientation of the bands is about 20 to 30 • E from the compression direction.…”

Section: Stress Temperaturementioning

confidence: 59%

“…1). Details of the procedure for sample preparation can be found in Grennerat et al (2012) and Chauve et al (2015).…”

Section: Methodsmentioning

confidence: 99%

“…The effect of a deformation going out of the plane xOy was estimated in previous analyses performed by Grennerat et al (2012) and shown to remain low, within Figure 1. Scheme of the experimental setup showing the shape of the sample with the direction of imposed stress (red arrow).…”

Section: Methodsmentioning

confidence: 99%

“…During the experiment, DIC analyses were performed over the full surface of the samples by following the procedure adapted to ice by Grennerat et al (2012). DIC provides in situ measurements of the displacement and therefore strain field on the sample surface, from the correlation of surface images of a grey-level speckle that follows the sample deformation.…”

Section: Methodsmentioning

confidence: 99%

“…Strain localization bands may follow grain boundaries, but they also cross entire grains, and there is no statistical link between the crystallographic orientation and the amount of local strain (Grennerat et al, 2012). These first measurements of strain localization during laboratory experiments were restricted to transient (or primary) creep conditions, in ductile conditions (σ < 0.5 MPa and T > 0.97 T m ) and prior to any microstructure modification due to dynamic recrystallization.…”

Section: Introductionmentioning

confidence: 99%

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Strain field evolution at the ductile-to-brittle transition: a case study on ice

et al. 2017

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Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular 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 the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.

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Section: Stress Temperaturementioning

confidence: 59%

“…1). Details of the procedure for sample preparation can be found in Grennerat et al (2012) and Chauve et al (2015).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain field evolution at the ductile-to-brittle transition: a case study on ice

et al. 2017

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Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures

Cyprych

Brune

Piazolo

et al. 2016

Geochem. Geophys. Geosyst.

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We use a centimeter-scale 2-D numerical model to investigate the effect of the presence of a second phase with various volume percent, shape, and orientation on strain localization in a viscoelastic matrix. In addition, the evolution of bulk rheological behavior of aggregates during uniaxial compression is analyzed. The rheological effect of dynamic recrystallization processes in the matrix is reproduced by viscous strain softening. We show that the presence of hard particles strengthens the aggregate, but also causes strain localization and the formation of ductile shear zones in the matrix. The presence of soft particles weakens the aggregate, while strain localizes within the particles and matrix between particles. The shape and the orientation of second phases control the orientation, geometry, and connectivity of ductile shear zones. We propose an analytical scaling method that translates the bulk stress measurements of our 2-D simulations to 3-D experiments. Comparing our model to the laboratory uniaxial compression experiments on ice cylinders with hard second phases allows the analysis of transient and steady-state strain distribution in ice matrix, and strain partitioning between ice and second phases through empirical calibration of viscous softening parameters. We find that the ice matrix in two-phase aggregates accommodates more strain than the applied bulk strain, while at faster strain rates some of the load is transferred into hard particles. Our study illustrates that dynamic recrystallization processes in the matrix are markedly influenced by the presence of a second phase.

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Heterogeneity of inelastic strain during creep of Carrara marble: Microscale strain measurement technique

Quintanilla-Terminel

Evans

2016

JGR Solid Earth

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We combined the split cylinder technique with microfabrication technology to observe strain heterogeneities that were produced during high‐pressure transient creep of Carrara marble. Samples were patterned with a custom‐designed grid of markers spaced 10 µm apart and containing an embedded coordinate system. The microscale strain measurement (MSSM) technique described here allowed us to analyze the local strain distribution with unprecedented detail over large regions. The description of the strain field is a function of the area over which strain is being computed. The scale at which the strain field can be considered homogeneous can provide insight into the deformation processes taking place. At 400–500°C, when twinning production is prolific, we observe highly strained bands that span several grains. One possible cause for the multigrain bands is the need to relieve strain incompatibilities that result when twins impinge on neighboring grains. At 600–700°C, the strain fields are still quite heterogeneous, and local strain varies substantially within grains and near grain boundaries, but the multigrain slip bands are not present. Deformation is concentrated in much smaller areas within grains and along some grain boundaries. The disappearance of the multigrain slip bands occurs when the deformation conditions allow additional slip systems to be activated. At 600°C, when the total strain is varied from 0.11 to 0.36, the spatial scale of the heterogeneity does not vary, but there are increases in the standard deviation of the distribution of local strains normalized by the total strain; thus, we conclude that the microstructure does not achieve a steady state in this strain interval.

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Experimental characterization of the intragranular strain field in columnar ice during transient creep

Cited by 80 publications

References 53 publications

Strain field evolution at the ductile-to-brittle transition: a case study on ice

Strain field evolution at the ductile-to-brittle transition: a case study on ice

Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures

Heterogeneity of inelastic strain during creep of Carrara marble: Microscale strain measurement technique

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