Fatigue crack growth in an aluminum alloy

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-11-19
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Mcode
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Language
en
Pages
6
1-6
Series
PHYSICAL REVIEW RESEARCH, Volume 3, issue 4
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.
Description
| openaire: EC/H2020/857470/EU//NOMATEN
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Citation
Lomakin , I V , Mäkinen , T , Widell , K , Savolainen , J , Coffeng , S , Koivisto , J & Alava , M J 2021 , ' Fatigue crack growth in an aluminum alloy : Avalanches and coarse graining to growth laws ' , PHYSICAL REVIEW RESEARCH , vol. 3 , no. 4 , L042029 , pp. 1-6 . https://doi.org/10.1103/PhysRevResearch.3.L042029