A description of crevasse formation using continuum damage mechanics
| Autor: | Antoine Pralong, Martin Funk, Martin P. Lüthi |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Surface (mathematics)
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Continuum (topology) Isotropy Flow (psychology) Glacier 02 engineering and technology Mechanics 01 natural sciences Acceleration 020303 mechanical engineering & transports Crevasse 0203 mechanical engineering Creep Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1727-5644 0260-3055 |
| DOI: | 10.3189/172756403781816077 |
| Popis: | Continuum damage mechanics describes the progressive deterioration of material subjected to loading. Jointly used with a level-set method, it proves to be a promising approach to computing the interface motion of a damaged material. For polycrystalline ice, a local isotropic damage evolution law (generalized Kachanow’s law) applied to Glen’s flow law allows the description of tertiary creep and facilitates the modeling of crevasse opening using a failure criterion based on damage accumulation. The use of a level-set method permits the description, in a continuum approach, of the motion of a fractured glacier surface. Using these methods, a model is developed. The ability of this model to describe phenomena connected to crevasse opening is presented. The rupture of a large ice block from a hanging glacier is computed and analyzed. The regular acceleration of such an unstable ice block prior to its collapse is calculated and compared to the acceleration function obtained from observations. A good agreement between the two acceleration functions was found. |
| Databáze: | OpenAIRE |
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