This paper has shown that in Region I crack growth test data reveals the similitude hypothesis to be invalid. It has also outlined recent work on the generalised Frost-Dugdale crack growth law and revealed how it relates to dislocation based models and fractal fatigue concepts, as well as to crack growth models where the notch tip is not assumed to be sharp. We have shown that crack growth test data obtained from a range of materials characterisation programs, and full-scale fatigue tests are often consistent with the generalised Frost-Dugdale crack growth law. Variants of this law have been used to predict crack growth in a range of full-scale aircraft fatigue tests and coupon tests. The various examples presented show that this approach: (i) is generally consistent with experimental results, (ii) provides a reasonable representation of macroscopic observations of crack growth in a range of alloys, (iii) has the potential to accurately predict crack growth in real aircraft structures under complex load spectra, and (iv) can be related to fractal and dislocation based growth laws as well as to the two parameter crack growth law.
The generalised Frost-Dugdale approach to modelling fatigue crack growth
Die verallgemeinerte Frost-Dugdale-Methode zur Modellierung des Wachstums von Ermüdungsrissen
Engineering Failure Analysis ; 15 , 8 ; 1130-1149
2008
20 Seiten, 23 Bilder, 5 Tabellen, 64 Quellen
Article (Journal)
English
Crack growth at low Delta K's and the Frost-Dugdale law
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