| Issue |
EPL
Volume 83, Number 4, August 2008
|
|
|---|---|---|
| Article Number | 46004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/83/46004 | |
| Published online | 06 August 2008 | |
A coarse-grained model of thermally activated damage in heterogeneous media: Time evolution of the creep rate
Department of Applied Mathematics, University of Crete - Heraklion 714 09, Greece, EU
Corresponding author: theocharis@tem.uoc.gr
Received:
4
March
2008
Accepted:
4
July
2008
A coarse-grained mean-field model is proposed where the damage enhanced creep of heterogeneous materials is described by the theory of absolute reaction rates. The dynamics of the proposed model, below a critical load, is characterized by an intensive precursor activity in the form of avalanches of microscopic breaking events that leads to a final catastrophic cascade occurring at a finite strain. Above the critical load, failure is instantaneous. The critical load is the static (elastic) fracture strength; thus the model is consistent with its time-independent analogue. Finally, the proposed model reproduces the experimental observations on the time evolution of the creep rate.
PACS: 62.20.Hg – Creep / 81.40.Np – Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EPLA, 2008
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