Intermittent dislocation density fluctuations in crystal plasticity from a phase-field crystal model
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Intermittent dislocation density fluctuations in crystal plasticity from a phase-field crystal model. / Tarp, Jens M.; Angheluta, Luiza; Mathiesen, Joachim; Goldenfeld, Nigel.
I: Physical Review Letters, Bind 113, Nr. 26, 265503, 31.12.2014.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Intermittent dislocation density fluctuations in crystal plasticity from a phase-field crystal model
AU - Tarp, Jens M.
AU - Angheluta, Luiza
AU - Mathiesen, Joachim
AU - Goldenfeld, Nigel
PY - 2014/12/31
Y1 - 2014/12/31
N2 - Plastic deformation mediated by collective dislocation dynamics is investigated in the two-dimensional phase-field crystal model of sheared single crystals. We find that intermittent fluctuations in the dislocation population number accompany bursts in the plastic strain-rate fluctuations. Dislocation number fluctuations exhibit a power-law spectral density 1/f2 at high frequencies f. The probability distribution of number fluctuations becomes bimodal at low driving rates corresponding to a scenario where low density of defects alternates at irregular times with high populations of defects. We propose a simple stochastic model of dislocation reaction kinetics that is able to capture these statistical properties of the dislocation density fluctuations as a function of shear rate.
AB - Plastic deformation mediated by collective dislocation dynamics is investigated in the two-dimensional phase-field crystal model of sheared single crystals. We find that intermittent fluctuations in the dislocation population number accompany bursts in the plastic strain-rate fluctuations. Dislocation number fluctuations exhibit a power-law spectral density 1/f2 at high frequencies f. The probability distribution of number fluctuations becomes bimodal at low driving rates corresponding to a scenario where low density of defects alternates at irregular times with high populations of defects. We propose a simple stochastic model of dislocation reaction kinetics that is able to capture these statistical properties of the dislocation density fluctuations as a function of shear rate.
U2 - 10.1103/PhysRevLett.113.265503
DO - 10.1103/PhysRevLett.113.265503
M3 - Journal article
C2 - 25615353
AN - SCOPUS:84920288202
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 26
M1 - 265503
ER -
ID: 130735381