Item: Anti-crack nucleation in snowpacks without assuming initial defects: modeling dry snow slab avalanches
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Title: Anti-crack nucleation in snowpacks without assuming initial defects: modeling dry snow slab avalanches
Proceedings: International Snow Science Workshop Proceedings 2018, Innsbruck, Austria
Authors:
- Philipp L. Rosendahl [ 2phi, www.2phi.de, Darmstadt, Germany ] [ Technische Universtität Darmstadt, Fachgebiet Strukturmechanik, Darmstadt, Germany ]
- Vera Lübke [ Technische Universtität Darmstadt, Fachgebiet Strukturmechanik, Darmstadt, Germany ]
- Philipp Weißgraeber [ 2phi, www.2phi.de, Darmstadt, Germany ] [ Robert Bosch GmbH, Corporate Research and Advance Engineering, Renningen, Germany ]
Date: 2018-10-07
Abstract: To improve modeling of slab avalanche release we propose a new mechanical snowpack model and a novel criterion for anticrack nucleation. The model allows to analyze skier-loaded slopes as well as PST experiments. We obtain closed-form analytical expressions for shear and normal stresses in the weak layer as well as for the energy release rate of cracks, which are in very good agreement with finite element analyses. In this work, a new conceptual understanding of the fracture initiation process of dry snow slab avalanches is developed. It makes use of the coupled stress and energy criterion in the framework of finite fracture mechanics. No assumption of initial flaw size is required. The initiation of defects and subsequent crack propagation is covered by a single criterion containing both a strength of materials and a fracture mechanics condition.
Language of Article: English
Presenters:
Keywords: slab avalanche release, fracture mechanics, predictive modeling, snowpack model
Page Number(s): 880-884
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Digital Abstract Not Available
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