Three-dimensional fatigue cracking under elastic–plastic deformation

Aircraft engine structures can contain small cracks, which have developed from defects induced during material processing. Advanced structural materials such as nickel-based superalloys undergo extensive plastic deformation prior to failure, therefore, these small cracks can be subjected to localize...

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Bibliographic Details
Published in:International journal of fatigue 2001, Vol.23, p.65-70
Main Authors: Staroselsky, A, Vestergaard, L, Annigeri, B, Favrow, L, Walls, D
Format: Article
Language:English
Subjects:
Applied sciences
Crack
Elastic plastic
Exact sciences and technology
Fatigue
Finite elements
J-integral
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Superalloy
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Summary:Aircraft engine structures can contain small cracks, which have developed from defects induced during material processing. Advanced structural materials such as nickel-based superalloys undergo extensive plastic deformation prior to failure, therefore, these small cracks can be subjected to localized damage with significant amount of plasticity. We have conducted a combined computational/experimental study of fatigue crack growth at room temperature and at 260°C. The experimental results have been correlated with three-dimensional finite element calculations. Material constitutive equations and a computational procedure to calculate energy release rate along the crack front are developed. It is shown that the fatigue crack growth rate is related to a power function of J max.
ISSN:0142-1123
1879-3452
DOI:10.1016/S0142-1123(01)00120-7