Observing Load Sequence Effects on Simulated and Experimental Fatigue Crack Growth Occurrence

Abstract:

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Load cycle interactions can have a significant effect in fatigue crack growth (FCG) under variable amplitude loading. Studying of FCG and fatigue life calculation under spectrum loading is important for the reliable life prediction of engineering structures. Many models have been proposed, but yet no universal model exists. In this paper, a fatigue life predicted under various load spectra, using three different fatigue crack growth models namely, the Austen, modified Forman and NASGRO models. These models are validated with fatigue crack growth test data under various amplitude loadings. This application is performed with aids of three-point bend specimens of ASTM A533 steel material. The results clearly show the load sequences effect and the predicted results agree with some discrepancies between the different models as well as with the test data. Thus, neglecting the effect of cycle interaction in fatigue calculations under variable amplitude loading can lead to invalid life predictions.

Info:

Periodical:

Key Engineering Materials (Volumes 462-463)

Edited by:

Ahmad Kamal Ariffin, Shahrum Abdullah, Aidy Ali, Andanastuti Muchtar, Mariyam Jameelah Ghazali and Zainuddin Sajuri

Pages:

489-494

DOI:

10.4028/www.scientific.net/KEM.462-463.489

Citation:

S.M. Beden et al., "Observing Load Sequence Effects on Simulated and Experimental Fatigue Crack Growth Occurrence", Key Engineering Materials, Vols. 462-463, pp. 489-494, 2011

Online since:

January 2011

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Price:

$35.00

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