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| Titel |
A new mixed-mode fracture criterion for large-scale lattice models |
| VerfasserIn |
T. Sachau, D. Koehn |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 1 ; Nr. 7, no. 1 (2014-01-29), S.243-247 |
| Datensatznummer |
250115540
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| Publikation (Nr.) |
 copernicus.org/gmd-7-243-2014.pdf |
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| Zusammenfassung |
| Reasonable fracture criteria are crucial for the modeling of dynamic failure
in computational lattice models. Successful criteria exist for experiments on
the micro- and on the mesoscale, which are based on
the stress that a bond experiences. In this paper, we test the applicability
of these failure criteria to large-scale models, where gravity plays an
important role in addition to the externally applied deformation. Brittle
structures, resulting from these criteria, do not resemble the outcome
predicted by fracture mechanics and by geological observations. For this
reason we derive an elliptical fracture criterion, which is based on the
strain energy stored in a bond. Simulations using the new criterion result in
realistic structures. It is another great advantage of this fracture model
that it can be combined with classic geological material parameters: the
tensile strength σ0 and the shear cohesion τ0. The proposed
fracture criterion is much more robust with regard to numerical strain
increments than fracture criteria based on stress (e.g., Drucker–Prager). While
we tested the fracture model only for large-scale structures, there is strong
reason to believe that the model is equally applicable to lattice simulations
on the micro- and on the mesoscale. |
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