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Published in:
Microscopic Strain Localization of Ti-6Al-4V Alloy Under Uniaxial Tensile Loading Read chapter Read first chapter

2019 | OriginalPaper | Chapter

39. Influence of Microstructural Inhomogeneities on the Fatigue Crack Growth Behavior Under Very Low Amplitudes for Two Different Aluminum Alloys

Authors : T. Kirsten, M. Kuczyk, M. Wicke, A. Brückner-Foit, F. Bülbül, H.-J. Christ, M. Zimmermann

Published in: Mechanical Fatigue of Metals

Publisher: Springer International Publishing

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Abstract

In the present paper the aluminum alloys EN AW-6082 (peak-aged and overaged) and EN AW-5083 (solution annealed) were investigated regarding the long fatigue crack growth behavior in the range of very low amplitudes and therefore very high number of load cycles. The cracks were initiated at micro notches, prepared by means of focused ion beam technology and examined in situ by a long distance microscope. In first experiments the threshold for each material condition was defined. Subsequently the tests were carried out at constant ΔK values. Further analysis such as electron backscatter diffraction (EBSD) and confocal microscopy were executed to analyze the fatigue crack growth behavior. A microstructural barrier function of the primary precipitates could be detected for each material condition. Grain boundaries seem to influence the crack growth only in case of the work hardening alloy (EN AW-5083), which is the material with smaller average grain size compared to EN AW-6082.

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previous chapter Fatigue Testing at 1000 Hz Testing Frequency
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Kirsten T, Bülbül F, Wicke M, Christ H-J, Brückner-Foit A, Zimmermann M (2018) Influence of microstructural discontinuities on the behaviour of long fatigue cracks in the VHCF regime for the aluminium alloys EN AW 6082 and EN AW 5083. In: Matec web of conference, vol 165, p 20005
Metadata
Title
Influence of Microstructural Inhomogeneities on the Fatigue Crack Growth Behavior Under Very Low Amplitudes for Two Different Aluminum Alloys
Authors
T. Kirsten
M. Kuczyk
M. Wicke
A. Brückner-Foit
F. Bülbül
H.-J. Christ
M. Zimmermann
Copyright Year
2019
Book
Mechanical Fatigue of Metals

Print ISBN: 978-3-030-13979-7

Electronic ISBN: 978-3-030-13980-3

Copyright Year: 2019

DOI
https://doi.org/10.1007/978-3-030-13980-3_39

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