Waveform and frequency effects on corrosion-fatigue crack growth behaviour in modern marine steels

Simple item page
dc.contributor.authorIgwemezie, Victor C.
dc.contributor.authorMehmanparast, Ali
dc.date.accessioned2020-02-06T20:08:53Z
dc.date.available2020-02-06T20:08:53Z
dc.date.issued2020-01-25
dc.description.abstractThe primary focus of this work is to investigate the sensitivity of cyclic waveform, frequency (f), load level and microstructure on the corrosion-fatigue crack growth rate (CFCGR) in modern normalised-rolled (NR) and thermomechanical control process (TMCP) ferrite-pearlite steels in the Paris Region of the da/dN vs. ΔK log-log plot. Constant amplitude sinewave (si) and trapezoid waveform (generally referred to here as hold-time (h-t)) were used under frequencies of 0.2 Hz, 0.3 Hz and 0.5 Hz and stress ratio of 0.1. Comparison is also made between the crack path in the S355 TMCP steel under si and h-t in seawater (SW). The role of microstructure in retarding or accelerating fatigue crack growth in SW is also discussed. Experimental results showed that the CFCGR corresponding to the si is higher than that of the h-t for all the load levels and frequencies examined. It was observed that reduction in the f and fatigue load level increased the CFCGR for the h-t but had little effect on the si. Generally, f in the range 0.2–0.5 Hz had little effect; and for a given f an increase in load led to a reduction in the CFCGR, in the Paris Region (PR) for both si and h-t in SW. Under both si and h-t, the CFCGR in the TMCP steels (e.g. S355G8 + M, S355G10 + M) is lower than that of the normalised steels (e.g. S355J2 + N). Metallurgical analyses on the fractured surface of corrosion-fatigue specimens show that the main active crack tip blunting process is the primary factor controlling the CFCGR of steel at high stress intensity factor range (SIFR) and low f in SW. The results obtained from this study have been discussed in terms of the potential impact on the structural design and integrity of offshore wind turbine foundations.en_UK
dc.identifier.citationIgwemezie V, Mehmanparast A. (2020) Waveform and frequency effects on corrosion-fatigue crack growth behaviour in modern marine steels, International Journal of Fatigue, Volume 134, May 2020, Article number 105484en_UK
dc.identifier.cris26124886
dc.identifier.issn0142-1123
dc.identifier.urihttps://doi.org/10.1016/j.ijfatigue.2020.105484
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/15106
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectS355 steelen_UK
dc.subjectCorrosion-fatigueen_UK
dc.subjectSinewaveen_UK
dc.subjectHold-timeen_UK
dc.subjectSeawateren_UK
dc.subjectMicrostructureen_UK
dc.titleWaveform and frequency effects on corrosion-fatigue crack growth behaviour in modern marine steelsen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
corrosion-fatigue-modern_marine_steels-2020.pdf
Size:
16.38 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)