On the physical basis for the creep of ice: the high temperature regime

Abstract This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics. An analysis of quasistatic and dynamic cyclic loading data for several ice types leads to the conclusion that high temperatur...

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Bibliographic Details
Published inJournal of glaciology Vol. 66; no. 257; pp. 401 - 414
Main Author Cole, D.M.
Format Journal Article
LanguageEnglish
Published Cambridge Cambridge University Press 01.06.2020
Subjects
Creep rate
Cyclic loading
Cyclic loads
Deformation
Deformation mechanisms
Dislocation density
Dislocation mobility
Experiments
Freshwater
Freshwater ice
Grain boundaries
High temperature
Ice
Ice dynamics
ice physics
ice rheology
Inland water environment
Laboratories
Mechanics
Melting point
Melting points
Solifluction
Temperature
Temperature effects
Temperature regime
Viscoelasticity
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Summary:Abstract This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics. An analysis of quasistatic and dynamic cyclic loading data for several ice types leads to the conclusion that high temperature (e.g. T ≥ −8°C) behavior is the result of a thermally induced increase in the number of mobile dislocations rather than an increase in the activation energy of dislocation glide or the introduction of a new deformation mechanism. The relationship between dislocation density and temperature is quantified and the model is shown to adequately represent the published minimum creep rate vs stress data for isotropic granular freshwater ice for −48 ≤ T ≤ −0.01°C.
ISSN:0022-1430
1727-5652
DOI:10.1017/jog.2020.15