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Determination of Material Constants for Crack Size-Dependence Crack Growth Model

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Abstract:

A crack size-dependence crack growth model was used to characterise the fatigue crack growth in AL 7075-T6 and AL 2024-T351 alloys. It is shown that the crack growth parameters %K and a can be used to linearise the crack growth in regions I (elastic) and II (plastic) by plotting fatigue data linear-linear da/dN×√a versus %K3, where cubic stress dependency is assumed. A theoretical attempt was made to relate this crack size-dependence fatigue crack growth parameters to the strain-life relationship constants. A reasonably good agreement was achieved when comparing between the theoretical predicted and experimental determined material constants.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

2189-2192

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2189

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Online since:

October 2007

Authors:

U.H. Tiong, Rhys Jones, Lorrie Molent

Keywords:

Crack Size-Dependence, Fatigue Crack Growth (FCG), Frost-Dugdale, Non-Similitude

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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