Numerical DEM analyses under simple shear conditions: the steady state for granular matters under large strain rates
| Autor: | Di Prisco, C., Rinaldi, G., stefano utili |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Granular materials
DEM simple plane shear tests shear rate rheology Finite element method Granular materials Computational methods in mechanics Particle methods (Numerical analysis) simple plane shear tests Elements finits Mètode dels DEM rheology Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC] |
| Zdroj: | Scopus-Elsevier UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The comprehension of the mechanical behaviour of granular materials under a wide range of strain rates is nowadays considered to be essential for the understanding of the mechanisms of both inception and evolution of large and catastrophic landslides. In this perspective, the authors have decided to perform a large series of DEM numerical analyses on an ideal granular specimen loaded under simple shear conditions. In fact, this is judged to be the unique suitable numerical tool to be used for mechanically interpreting the transition of this class of materials from the solid-like to thefluid-like phase: the first one being dominated by long lasting chains of forces within the so-called solid-skeleton, the second one being governed by semi-instantaneous impacts among particles characterized by a generalized state of agitation. In this paper, the steady state is the main focus of investigation. The main fundamental issues explored are: (i) the size of the representative elementary volume, (ii) the perturbation necessary for the steady state to be reached. In fact, according to the authors, all these information are quite useful for conceiving new constitutive relationships, based on the classical continuum mechanics and capable of describing the previously cited phase transition |
| Databáze: | OpenAIRE |
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