Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Cyprych, Daria; Piazolo, Sandra; Wilson, Christopher J.L.; Luzin, Vladimir; Prior, David J.

doi:10.1016/j.epsl.2016.06.010

Cited by 16 publications

(30 citation statements)

References 46 publications

(70 reference statements)

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“…This is in contrast to laboratory experiments of Cyprych et al . [], where load is applied from one direction only. However, numerical tests of the two setups show identical stresses in both cases (supporting information Appendix C).…”

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 80%

“…From their experimental study, Cyprych et al . [] conclude that, at the applied temperatures and strain rates, in all the tested samples, ice deforms in the dislocation creep regime through slip on basal (0001) planes in the <11–20> direction and, thus, samples deform under power law behavior. Strain is predominantly accommodated by grains oriented favorably for slip, i.e., with c‐axis (pole to (0001)) oriented about 45° to σ 1 .…”

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 98%

“…Set II applies the model to deformation experiments of ice mixtures, including a direct comparison to laboratory experiments by Cyprych et al . [].…”

Section: Model Descriptionmentioning

confidence: 99%

“…In the Set II models, we apply the conditions and matrix‐particle characteristics following those from laboratory experiments of Cyprych et al . []. This allows us to evaluate the robustness of the model results as well as the necessary changes to softening parameters needed to reproduce the experimental results.…”

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 99%

“…[]; ice mixtures: Cyprych et al . []); (b) Numerical Set II results; note modeled stresses were recalculated by dividing the result by R =1.22 (see section 2.4 for further explanation). cg: coarse‐grained, fg: fine‐grained,

\dot{ε} :

‐ starting axial strain rate.…”

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 99%

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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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Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 80%

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 98%

“…Set II applies the model to deformation experiments of ice mixtures, including a direct comparison to laboratory experiments by Cyprych et al . [].…”

Section: Model Descriptionmentioning

confidence: 99%

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 99%

\dot{ε} :

‐ starting axial strain rate.…”

Section: Numerical Set Ii: Application To Deformation Behavior Of Icementioning

confidence: 99%

See 3 more Smart Citations

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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Insights into anisotropy development and weakening of ice from in situ P wave velocity monitoring during laboratory creep

et al. 2017

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Polycrystalline ice weakens significantly after a few percent strain, during high homologous temperature deformation. Weakening is correlated broadly with the development of a crystallographic preferred orientation (CPO). We deformed synthetic polycrystalline ice at −5°C under uniaxial compression, while measuring ultrasonic P wave velocities along several raypaths through the sample. Changes in measured P wave velocities (Vp) and in the velocities calculated from microstructural measurements of CPO (by cryo‐electron backscatter diffraction) both show that velocities along trajectories parallel and perpendicular to shortening decrease with increasing strain, while velocities on diagonal trajectories increase. Thus, in these experiments, velocity data provide a continuous measurement of CPO evolution in creeping ice. Samples reach peak stresses after 1% shortening. Weakening corresponds to the start of CPO development, as indicated by divergence of P wave velocity changes for different raypaths, and initiates at ≈3% shortening. Selective growth by strain‐induced grain boundary migration (GBM) of grains favorably oriented for basal slip may initiate weakening through the formation of an interconnected network of these grains by 3% shortening. After weakening initiates, CPO continues to develop by GBM and nucleation processes. The resultant CPO has an open cone (small circle) configuration, with the cone axis parallel to shortening. The development of this CPO causes significant weakening under uniaxial compression, where the shear stresses resolved on the basal planes (Schmid factors) are high.

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Deformation behavior of migmatites: insights from microstructural analysis of a garnet–sillimanite–mullite–quartz–feldspar-bearing anatectic migmatite at Rampura–Agucha, Aravalli–Delhi Fold Belt, NW India

Prakash

Piazolo

Saha

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Cited by 16 publications

References 46 publications

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

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

Insights into anisotropy development and weakening of ice from in situ P wave velocity monitoring during laboratory creep

Deformation behavior of migmatites: insights from microstructural analysis of a garnet–sillimanite–mullite–quartz–feldspar-bearing anatectic migmatite at Rampura–Agucha, Aravalli–Delhi Fold Belt, NW India

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