Intermittent crack growth in fatigue

R. Kokkoniemi, A. Miksic*, M. Ovaska, L. Laurson, M. J. Alava

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Fatigue occurs under cyclic loading at stresses below a material's static strength limit. We consider fatigue crack growth as a stochastic process and perform crack growth experiments in a metal (copper). We follow optically cracks propagating from initial edge notches. The main interest is in the dynamics of the crack growth - the Paris' law and the initiation phase prior to that - and especially the intermittency this is discovered to display. How the sampling of the crack advancement, performed at regular intervals, influences such measurement results is analysed by the analogy of planar crack dynamics in slow, driven growth.

Original languageEnglish
Article number073401
Pages (from-to)1-16
JournalJournal of Statistical Mechanics: Theory and Experiment
Volume2017
Issue number7
DOIs
Publication statusPublished - 4 Jul 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • avalanches
  • fracture
  • heterogeneous materials
  • stochastic processes

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