Fatigue crack growth in an aluminum alloy: Avalanches and coarse graining to growth laws

Ivan V. Lomakin, Tero Mäkinen*, Kim Widell, Juha Savolainen, Sebastian Coffeng, Juha Koivisto, Mikko J. Alava

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
59 Downloads (Pure)

Abstract

In fatigue fracture the crack growth is slow and in many materials exhibits apparent self-similarity as expressed by the dependence of the growth velocity on a stress intensity factor that grows with the crack size. We study the intermittency of fatigue crack dynamics in aluminium alloys by optical tracking. A power-law distribution of crack tip jumps is found with an exponent close to two and a cutoff which increases with time or crack propagation. The cutoff is related to the crack velocity. We show how such a distribution evolves or coarse grains with the scale of observation or time window. The correlations of the crack propagation imply short-range memory effects in the underlying dynamics. Our results show universal features of fatigue cracks and how these lead to the crack growth and failure in material samples.

Original languageEnglish
Article numberL042029
Pages (from-to)1-6
Number of pages6
JournalPHYSICAL REVIEW RESEARCH
Volume3
Issue number4
DOIs
Publication statusPublished - 19 Nov 2021
MoE publication typeA1 Journal article-refereed

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