A unified method of design for fatigue crack growth resistance in structural materials

► A novel design method was developed based on the two parameter approach. ► The relative roles of Kmax and ΔK were identified for a wide range of materials. ► The method accounts for the effects of closure, R, Kmax, and residual stress. ► Long and physically small fatigue crack growth data can be s...

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Bibliographic Details
Published in:International journal of fatigue 2013-02, Vol.47, p.58-70
Main Authors: Gavras, Anastasios G., Lados, Diana A., Keith Donald, J.
Format: Article
Language:English
Subjects:
Applied sciences
Closure
Crack propagation
Cracks
Driving
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue failure
Fracture mechanics
Kmax and ΔKth parameters
Long and physically small fatigue crack growth
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Philosophy
Residual stress
Stress ratio
Structural materials
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Summary:► A novel design method was developed based on the two parameter approach. ► The relative roles of Kmax and ΔK were identified for a wide range of materials. ► The method accounts for the effects of closure, R, Kmax, and residual stress. ► Long and physically small fatigue crack growth data can be successfully predicted. It is well established that there are two fatigue crack tip driving forces – the cyclic, ΔK, and the static, Kmax. In this study, the effects of each crack tip driving force on crack growth were evaluated for various structural materials. A unified method of design that allows for predicting the response of long and physically small fatigue cracks at positive stress ratios is introduced. Good agreement between predicted and experimental long and physically small fatigue crack growth data was obtained. The importance of this method in material and component design is discussed as part of a contemporary design philosophy.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2012.07.009