Creep dynamics of viscoelastic interfaces
The movement of a purely elastic interface driven on a disordered energy potential is characterized by a depinning transition: when the pulling force σ is larger than some critical value o1 the system is in a flowing regime and moves at a finite velocity. On the other hand, if o < o1 the interfac...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2014 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/24543 |
| Acceso en línea: | http://hdl.handle.net/11336/24543 |
| Access Level: | acceso abierto |
| Palabra clave: | Creep https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | The movement of a purely elastic interface driven on a disordered energy potential is characterized by a depinning transition: when the pulling force σ is larger than some critical value o1 the system is in a flowing regime and moves at a finite velocity. On the other hand, if o < o1 the interface remains pinned and its velocity is zero. We show that in the case of a one-dimensional interface, the inclusion of viscoelastic relaxation produces the appearance of an intervening regime between the pinned and the flowing phases in a well-defined stress interval o0 < o < o1, in which the interface evolves through a sequence of avalanches that give rise to a creep process. As o - o0+ the creep velocity vanishes as a power law. As o < o0+ the creep velocity increases as a power law due to the increase of the typical size of the avalanches. The present observations may serve to improve the understanding of fatigue failure mechanisms. |
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