The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Victor Igwemezie; Ali Mehmanparast; Feargal Brennan

doi:10.1111/ffe.13312

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Victor Igwemezie^*, Ali Mehmanparast, Feargal Brennan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

27 Downloads (Pure)

Abstract

This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

Original language	English
Pages (from-to)	2416-2440
Number of pages	25
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	43
Issue number	10
Early online date	28 Jul 2020
DOIs	https://doi.org/10.1111/ffe.13312
Publication status	Published - 1 Oct 2020

Funding

This work was supported by grant EP/L016303/1 for Cranfield University, University of Oxford and University of Strathclyde Centre for Doctoral Training in Renewable Energy Marine Structures (REMS; http://www.rems-cdt.ac.uk/ ) from the UK Engineering and Physical Sciences Research Council (EPSRC).

Keywords

corrosion fatigue
crack path
crack tip blunting
microstructure
Paris Region
S355 steel

Access to Document

10.1111/ffe.13312Licence: CC BY 4.0

Igwemezie-etal-FFEMS-2020-The-influence-of-microstructure-on-the-fatigue-crack-growthFinal published version, 53.1 MBLicence: CC BY 4.0

Cite this

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title = "The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region",

abstract = "This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.",

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AU - Igwemezie, Victor

AU - Mehmanparast, Ali

AU - Brennan, Feargal

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Y1 - 2020/10/1

N2 - This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

AB - This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

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KW - crack path

KW - crack tip blunting

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KW - S355 steel

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The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Abstract

Funding

Keywords

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REMS EPSRC Centre for Doctoral Training in Renewable Energy Marine Structures

Cite this

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Projects

REMS EPSRC Centre for Doctoral Training in Renewable Energy Marine Structures

Cite this