A dislocation-based model for creep recovery in ice

Cole, David M.

doi:10.1080/14786430412331284496

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…The basic stress and strain dependencies of the model satisfactorily simulate granular freshwater ice as demonstrated in a number of studies (Cole and Durell, 2001; Cole, 2003, 2004; Song and others, 2006 a , 2006 b , 2008), given attention to the value of ρ 0 . On the basis of the present effort, however, values of f 0 = 3 × 10 21 m −2 and Q ρ = 4.0054 × 10 −20 J (or 0.25 eV) in Eqn (3) were found for granular freshwater ice vs the above noted values for saline ice.…”

Section: Constitutive Model Summary and Implicationsmentioning

confidence: 75%

“…The constitutive model developed in Cole (1995, 2004) and Cole and Durell (1999, 2001) has elastic, anelastic (viscoelastic) and viscous components of strain. It quantifies two mechanisms of anelasticity (dislocation and grain boundary relaxations), and viscous straining occurs by the irrecoverable motion of basal dislocations.…”

Section: Constitutive Model Summary and Implicationsmentioning

confidence: 99%

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

Cole

2020

J. Glaciol.

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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.

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