Fatigue crack growth in an aluminum alloy: Avalanches and coarse graining to growth laws
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors
Lomakin, Ivan V.
Mäkinen, Tero
Widell, Kim
Savolainen, Juha
Coffeng, Sebastian
Koivisto, Juha
Alava, Mikko J.
Date
2021-11-19
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en
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6
1-6
1-6
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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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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