Modelling the ice single-crystal viscoplastic behaviour

Mansuy, Philippe; Meyssonnier, Jacques; Philip, Armelle

doi:10.1007/bfb0104184

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…However, these experiments are expected to provide some indication of the mechanisms involved in the deformation of ice, notably as regards the grain-to-grain interaction which is a crucial matter for modelling the macroscopic behaviour of anisotropic polar ice. Interpretation of the experimental results (Figs 7 and 8), in terms of a constitutive model for the grain, is given in more detail by Mansuy and others (1999).…”

Section: Discussionmentioning

confidence: 99%

Identification of strain heterogeneities arising during deformation of ice

2000

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Creep tests carried out on specimens of isotropic ice containing a monocrystalline inclusion allow us to observe some strain heterogeneities that develop during the deformation of polycrystalline ice. Different kinds of heterogeneities, some of them leading to strain localization, are observed and described, and mechanisms are proposed to explain how they arise. However, when the inclusion has a very regular shape with no geometric singularity (e.g. circular shape) and is embedded in a fine-grained isotropic matrix, the observations lead us to assume homogeneous deformation of the inclusion, with no strain localization except that associated with basal glide.

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Section: Discussionmentioning

confidence: 99%

Identification of strain heterogeneities arising during deformation of ice

2000

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“…Observations of the intragranular deformation of ice was already presented in [42,43,44,45] on 2-D microstructures, some of them including ellipsoidal inclusions. The DIC technique was not applied at that time and strain heterogeneities were characterized indirectly through lattice misorientation measurements.…”

Section: Strain Distributionmentioning

confidence: 99%

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

Grennerat¹,

Montagnat²,

Castelnau³

et al. 2012

Acta Materialia

112

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International audienceA digital image correlation (DIC) technique has been adapted to polycrystalline ice specimens in order to characterize the develop- ment of strain heterogeneities at an intragranular scale during transient creep deformation (compression tests). Specimens exhibit a columnar microstructure so that plastic deformation is essentially two-dimensional, with few in-depth gradients, and therefore surface DIC analyses are representative of the whole specimen volume. Local misorientations at the intragranular scale were also extracted from microstructure analyses carried out with an automatic texture analyzer before and after deformation. Highly localized strain patterns are evidenced by the DIC technique. Local equivalent strain can reach values as much as an order of magnitude larger than the macroscopic average. The structure of the strain pattern does not evolve with strain in the transient creep regime. Almost no correlation between the measured local strain and the Schmid factor of the slip plane of the underlying grain is observed, highlighting the importance of the mechanical interactions between neighboring grains resulting from the very large viscoplastic anisotropy of ice crystals. Finally, the experimental microstructure was introduced in a full-field fast Fourier transform polycrystal model; simulated strain fields are a good match with experimental ones

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“…The results presented were obtained by fixing the value of a at 1 and varying the value of (3, which characterizes the relative resistance to glide in the basal plane, from (3 = 1 (isotropy) to (3 = 0.001 which seems to be a lower bound for the single crystal (Duval and others, 1983; Mansuy and others, 1999). In the linear case, five computations were performed for each value of β on five polycrystals with different random distributions of the grain orientations.…”

Section: Finite-element Simulationsmentioning

confidence: 99%

Comparison of finite-element and homogenization methods for modelling the viscoplastic behaviour of a S2–columnar-ice polycrystal

Meyssonnier

Philip

2000

Ann. Glaciol.

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The main homogenization schemes used to model the behaviour of polycrystalline ice are assessed by studying the particular case of a two-dimensional polycrystal which represents natural S2–columnar ice. The results of the uniform-stress, uniform-strain-rate and one-site self-consistent models are compared to finite-element computations. The comparisons were made using the same model of grain, described as a continuous transversely isotropic medium, in the linear and non-linear cases. The uniform-stress and uniform-strain-rate models provide upper and lower bounds for the macroscopic fluidity which are too far from each other to be useful when a degree of anisotropy relevant to ice is considered. Although the self-consistent model gives a weak representation of the interaction between a grain and its surroundings, due to the strong anisotropy of the ice crystal, the resulting macroscopic behaviour is found to be acceptable when compared to the results from finite-element computations.

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Modelling the ice single-crystal viscoplastic behaviour

Cited by 8 publications

References 13 publications

Identification of strain heterogeneities arising during deformation of ice

Identification of strain heterogeneities arising during deformation of ice

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

Comparison of finite-element and homogenization methods for modelling the viscoplastic behaviour of a S2–columnar-ice polycrystal

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