# Intermittent dislocation density fluctuations in crystal plasticity from a phase-field crystal model

Source: [Intermittent dislocation density fluctuations in crystal plasticity from a phase-field crystal model](<https://www.sota2.com/research/paper/68fa2e471e209131ce860fe1>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T16:47:59.415Z

Authors: Jens M. Tarp, Luiza Angheluta, Joachim Mathiesen, Nigel Goldenfeld

Published: 2014-12-30T15:21:41.000Z

## Abstract

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 $1/f^2$ 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 alternate at irregular times with high population 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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1412.8653>)

[PDF](<https://arxiv.org/pdf/1412.8653.pdf>)