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Contribution à l'étude de l'endommagement de la glace columnaire S2 en compression uniaxiale

Abstract : This work is based on the study of the nucleation of micro cracks in polycrystalline ice. A large part of it consisted in designing a process to grow artificial "model" columnar ice. This structure controlled ice is very close to a two-dimensional material and could be used to connect experimental studies and theoretical analysis. Brick shaped specimens of "model" and "regular" columnar ice have been tested under uniaxial compression (constant load between -1 and -0.5 MPa). The largest face of the specimen was filmed continuously to localise each nucleation site in relation with the local microstructure. By following this experimental procedure, we have obtained a set of data on the number of cracks, their length and orientation together with strain measurements. The comparison between experimental results and theoretical analyses allows a better understanding of the mechanical behaviour of columnar S2- ice which experiences microcracking. Finally, by using the Eshelby's inclusion model in the case of a Newtonian viscoplastic material, which describes the microstructural stress concentrations, we have developed a model of crack initiation based on the stress intensity factor in mode 1.
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https://theses.hal.science/tel-00716389
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Submitted on : Tuesday, July 10, 2012 - 2:30:20 PM
Last modification on : Friday, March 25, 2022 - 11:10:22 AM
Long-term archiving on: : Thursday, December 15, 2016 - 10:17:16 PM

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  • HAL Id : tel-00716389, version 1

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Olivier Ple. Contribution à l'étude de l'endommagement de la glace columnaire S2 en compression uniaxiale. Glaciologie. Université Joseph-Fourier - Grenoble I, 1998. Français. ⟨NNT : ⟩. ⟨tel-00716389⟩

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