Finite element analysis of fatigue crack growth with interspersed mode I and mixed mode overloads

The fatigue crack growth in components or structures is influenced by the service loading. In contrast to a uniform fatigue crack growth during a constant amplitude loading, an overload for instance, which is interspersed into this constant amplitude loading, leads to a retardation effect. Within th...

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Bibliographic Details
Published in:International journal of fatigue 2005-08, Vol.27 (8), p.905-913
Main Authors: Sander, M., Richard, H.A.
Format: Article
Language:English
Subjects:
Applied sciences
Crack closure
Exact sciences and technology
Fatigue
Fatigue crack growth
Finite element simulation
Interaction effects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Mixed mode
Stress distribution
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Summary:The fatigue crack growth in components or structures is influenced by the service loading. In contrast to a uniform fatigue crack growth during a constant amplitude loading, an overload for instance, which is interspersed into this constant amplitude loading, leads to a retardation effect. Within the scope of this paper fatigue crack growth under variable amplitude loading in a real structure is modelled using an elastic–plastic finite element analysis. It can be shown that due to an overload depending on the overload ratio R ol and the mode I/mode II ratio plastic deformations occur, which on the one hand reduce the near-tip closure and cause a far-field closure. On the other hand, the plastic deformations change the stress distribution along the crack flanks as well as along the ligament. A comparison of the numerically determined fatigue crack growth rates with the experimental data shows a good agreement.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2004.10.008