Small fatigue crack growth in aluminium alloy EN-AW 6082/T6

The kinetics of small fatigue crack growth at room temperature was measured using light microscopy observation of the cracks in a shallow notch of a cylindrical specimen. Symmetrical tension–compression cycling was adopted. The growth of the crack was measured within the range of half surface crack...

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Bibliographic Details
Published in:International journal of fatigue 2010-12, Vol.32 (12), p.1913-1920
Main Authors: Jíša, D., Liškutín, P., Kruml, T., Polák, J.
Format: Article
Language:English
Subjects:
Alloy steels
Aluminium alloys
Aluminum
Aluminum base alloys
Applied sciences
Crack growth rate
Crack nucleation
Crack propagation
Cracks
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue failure
Fracture mechanics
Manson-Coffin law
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plastic deformation
Small cracks
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Summary:The kinetics of small fatigue crack growth at room temperature was measured using light microscopy observation of the cracks in a shallow notch of a cylindrical specimen. Symmetrical tension–compression cycling was adopted. The growth of the crack was measured within the range of half surface crack length from ∼10 μm up to ∼2 mm. A linear dependence between the crack growth rate and the crack length, observed in case of steels, was confirmed to be valid in the aluminium 6082/T6 alloy, too. The crack growth coefficient k g increases with plastic strain amplitude; this dependence is well described by a power law. The fatigue life prediction based on the crack growth measurements is compared with the Manson-Coffin law.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2010.06.003