Affiliation:
1. Institut für Mechanik Technische Universität Darmstadt Franziska-Braun-Straße 7 64287 Darmstadt Germany
2. Alfred-Wegener-Institut, Helmholtz Zentrum für Polar- und Meeresforschung Bremerhaven Germany
3. University of Bremen Department of Geosciences Bremen Germany
Abstract
AbstractIce shelves are large floating ice masses, that are formed when glaciers are becoming afloat at the margin of ice sheets. One dominating mass loss mechanism of ice shelves is calving, describing the detachment of icebergs at the front. Ice shelves stabilize inland ice glaciers due to buttressing. If the stabilizing effect of an ice shelf vanishes because of disintegration or thinning, the corresponding glacier accelerates resulting in sea level rise.To describe calving and disintegration of ice shelves, it is important to investigate fracture propagation in ice. A powerful method in fracture mechanics is the phase field method which is based on Griffith's theory. It approximates cracks in a diffuse manner by using a continuous scalar field. We propose a phase field fracture model for ice considering its characteristic material properties. The material behavior of ice depends on the considered time scales. On short time scales it behaves like a solid and while it acts like a fluid on long time scales, which classifies it as a viscoelastic material of Maxwell type. This has been verified by observations. The phase field method allows us to simulate typical fracture situations of ice shelves in Antarctica and Greenland.
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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1. Phase Field Modeling of Cracks in Ice;Progress in Structural Mechanics;2024