Fluctuations and Scaling in Creep Deformation

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2010
Major/Subject
Mcode
Degree programme
Language
en
Pages
100601/1-4
Series
Physical Review Letters, Volume 105, Issue 10
Abstract
The spatial fluctuations of deformation are studied in the creep in Andrade’s power law and the logarithmic phases, using paper samples. Measurements by the digital image correlation technique show that the relative strength of the strain rate fluctuations increases with time, in both creep regimes. In the Andrade creep phase characterized by a power-law decay of the strain rate ϵt∼t−θ, with θ≈0.7, the fluctuations obey Δϵt∼t−γ, with γ≈0.5. The local deformation follows a data collapse appropriate for a phase transition. Similar behavior is found in a crystal plasticity model, with a jamming or yielding transition.
Description
Keywords
condensed matter, statistical physics, material science, spatial fluctuations, deformation, paper samples, strain rate
Other note
Citation
Rosti, Jari & Koivisto, Juha & Laurson, Lasse & Alava, Mikko J. 2010. Fluctuations and Scaling in Creep Deformation. Physical Review Letters. Volume 105, Issue 10. 100601/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.105.100601.