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Evaluation of the criticality of cracks in ice shelves using finite element simulations

Author(s): C. Plate | R. Müller | A. Humbert | D. Gross

Journal: The Cryosphere Discussions
ISSN 1994-0432

Volume: 6;
Issue: 1;
Start page: 469;
Date: 2012;
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The ongoing disintegration of large ice shelf parts in Antarctica raise the need for a better understanding of the physical processes that trigger critical crack growth in ice shelves. Finite elements in combination with configurational forces facilitate the analysis of single surface fractures in ice under various boundary conditions and material parameters. The principles of linear elastic fracture mechanics are applied to show the strong influence of different depth dependent functions for the density and the Young's modulus on the stress intensity factor KI at the crack tip. Ice, for this purpose, is treated as a compressible solid and the consequences of this choice in comparison to the predominant incompressible approaches is discussed. The computed stress intensity factors KI for dry and water filled cracks are compared with critical values KIc from measurements that can be found in literature.
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