Analysis of primary creep of S2 fresh-water and saline ice

Abdel-Tawab, Khaled; Rodin, Gregory J.

doi:10.1016/s0165-232x(97)00010-4

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…The time-dependent behavior of freshwater ice has been addressed with great attention, and several constitutive mod-els were developed (Michel, 1978;Sinha, 1978;Le Gac and Duval, 1980;Ashby and Duval, 1985;Sunder and Wu, 1989;Mellor and Cole, 1983;Cole, 1990;Duval et al, 1991;Sunder and Wu, 1990;Abdel-Tawab and Rodin, 1997;Santaoja, 1990). Constitutive laws can be phenomenological or micromechanical.…”

Section: Introductionmentioning

confidence: 99%

“…Constitutive laws can be phenomenological or micromechanical. Micromechanical modeling in ice faces challenges because the characterization of the microscopic mechanisms of ice deformation is still inadequate (Abdel-Tawab and Rodin, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…The second group of phenomenological models starts from physically based models involving internal state variables (dislocation density, internal stresses reflecting hardening, etc. ); they develop differential equations for the evolution of these variables with time and quantify the dependence of these variables on stress, temperature, and strain (Le Gac and Duval, 1980;Wu, 1989, 1990;Abdel-Tawab and Rodin, 1997). These models provide insights into the microscopic mechanisms taking place, and the state variables describe the deformation resistance offered by changes in the microstructure of the material.…”

Section: Introductionmentioning

confidence: 99%

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Creep and fracture of warm columnar freshwater ice

et al. 2021

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Abstract. This work addresses the time-dependent response of 3 m×6 m floating edge-cracked rectangular plates of columnar freshwater S2 ice by conducting load control (LC) mode I fracture tests in the Aalto Ice Tank of Aalto University. The thickness of the ice plates was about 0.4 m and the temperature at the top surface about −0.3 ∘C. The loading was applied in the direction normal to the columnar grains and consisted of creep/cyclic-recovery sequences followed by a monotonic ramp to fracture. The LC test results were compared with previous monotonically loaded displacement control (DC) experiments of the same ice, and the effect of creep and cyclic sequences on the fracture properties were discussed. To characterize the nonlinear displacement–load relation, Schapery's constitutive model of nonlinear thermodynamics was applied to analyze the experimental data. A numerical optimization procedure using Nelder–Mead's (N-M) method was implemented to evaluate the model functions by matching the displacement record generated by the model and measured by the experiment. The accuracy of the constitutive model is checked and validated against the experimental response at the crack mouth. Under the testing conditions, the creep phases were dominated by a steady phase, and the ice response was overall elastic–viscoplastic; no significant viscoelasticity or major recovery was detected. In addition, there was no clear effect of the creep loading on the fracture properties at crack growth initiation: the failure load and crack opening displacements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Creep and fracture of warm columnar freshwater ice

et al. 2021

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“…This behavior is described by a creep formalism. Conceming poiycrystaiiine S2 fresh-water ice, Abdel-Tawab and Rodin [4] consider a deformation composed of an elastic part and a creep part based on primary creep. The creep behavior takes into account recovery effects.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Primary Creep in Modeling the Mechanical Behavior of Polycrystalline Ice

Aryanpour¹,

Farzaneh

2013

Journal of Offshore Mechanics and Arctic Engineering

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In most of the models proposed for deformation of ice, in addition to instantaneous elastic and viscoelastic parts, a viscoplastic part is also considered. An expression used for material secondary creep is usually employed to describe the viscoplastic component. In this study, however, another viscoplastic deformation of primary creep type is also considered in addition to the secondary creep. Therefore the permanent contribution of deformation is suggested to consist of primary and secondary creep parts. The existence of the primary creep contribution is investigated and characterized by using experimental results reported in the literature. The identified primary creep contribution is then validated by other available experimental results. Finally, the significance of primary creep in the inelastic behavior will be discussed.

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