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• W2029683309 abstract "Abstract A micromechanics based constitutive model is developed to predict the time dependent deformation behavior of ice under compressive load in which creep and microcracking are the two dominant mechanisms. The model is based on the idea that ice crystals undergo shear slip along the basal plane, and the microcracking is caused by the local stress due to the mismatch strain in the polycrystalline ice with randomly oriented basal plane. A single crystal is modeled as a cylindrical homogeneous inclusion embedded in an effective matrix of polycrystal aggregate. Eshelby's solution is used to estimate the local stress due to the mismatch strain. The stress-strain relation of the polycrystalline ice is calculated for arbitrary loading condition on the basis of single crystal property. Microcracking is predicted by assuming that the cracking occurs when the maximum tensile stress just outside a grain reaches the tensile strength of ice. Crack density is predicted as a function of time. The effect of crack formation in the deformation process is modeled as the reduction of the constraint of the surrounding matrix. The model predictions for constant load and constant strain rate tests are shown to demonstrate the validity of the model. The proposed constitutive model is implemented in the finite element analysis code to analyze two-dimensional indentation problems of ice sheet. The present analysis can predict ice forces which act on structures from a moving ice sheet; however, it is applicable only for a limited range of deformation rate of ice where creeping and microcracking are the only dominant mechanisms. As an example, a small scale indentation problem is analyzed and results are compared with existing experimental data with qualitative agreement." @default.
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• W2029683309 date "1994-11-01" @default.
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• W2029683309 title "A micromechanics-based constitutive model of polycrystalline ice and FEM analysis for prediction of ice forces" @default.
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• W2029683309 doi "https://doi.org/10.1016/0165-232x(94)90010-8" @default.
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