Fatigue Crack Propagation Limit Curves for High Strength Steels and their Application for Engineering Critical Assessment Calculations

János Lukács; Marcell Gáspár

doi:10.4028/www.scientific.net/AMR.891-892.563

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 891-892Fatigue Crack Propagation Limit Curves for High...

Fatigue Crack Propagation Limit Curves for High Strength Steels and their Application for Engineering Critical Assessment Calculations

Abstract:

There are different prescriptions containing fatigue crack propagation limit curves and rules for the prediction of the crack growth. The research work aimed (i) to determine fatigue crack propagation limit curves for high strength steels and their welded joints, based on the Paris-Erdogan law; (ii) to use the determined limit curves for engineering critical assessment (ECA) calculations. Experiments were performed on different high strength steels and their welded joints; and the propagating cracks in the specimens represent the different possible locations of the real cracks in the structural elements. Fatigue crack growth tests were executed by ΔK-decreasing and constant load amplitude methods. The evaluation process consists of six steps, and by means of the selected values a statistical method can be proposed for determination of the limit curves. Engineering critical assessment calculations were performed on a welded structural element having crack like defects.

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Periodical:

Advanced Materials Research (Volumes 891-892)

Pages:

563-568

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.891-892.563

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Online since:

March 2014

Authors:

János Lukács*, Marcell Gáspár

Keywords:

Engineering Critical Assessment (ECA), Fatigue Crack Growth (FCG), High Strength Steel (HSS), Limit Curve, Welded Joint

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References

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