Issue |
EPL
Volume 105, Number 4, February 2014
|
|
---|---|---|
Article Number | 46003 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/105/46003 | |
Published online | 26 February 2014 |
Creep dynamics of viscoelastic interfaces
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (8400) Bariloche, Argentina
Received: 31 October 2013
Accepted: 5 February 2014
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 the system is in a flowing regime and moves at a finite velocity. On the other hand, if
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
, in which the interface evolves through a sequence of avalanches that give rise to a creep process. As
the creep velocity vanishes as a power law. As
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.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 07.05.Tp – Computer modeling and simulation / 62.20.mm – Fracture
© EPLA, 2014
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