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Erschienen in: Metallurgical and Materials Transactions A 9/2012

01.09.2012

On the Distinction Between Plasticity- and Roughness-Induced Fatigue Crack Closure

verfasst von: Sotomi Ishihara, Yuya Sugai, Arthur J. McEvily

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 9/2012

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Abstract

A series of experiments has been carried out to determine why some alloys display plasticity-induced fatigue crack closure (PIFCC), whereas other alloys display roughness-induced crack closure (RIFCC). Two alloys were studied, the aluminum alloy 6061-T6 (PIFCC) and a steel of comparable yield strength, S25C (RIFCC). The experiments included the determination of the crack-opening levels as a function of ΔK, da/dN as a function of ΔK eff – ΔK effth, removal of the specimen surface layers, removal of the crack wake, the determination of crack front shapes, crack surface roughness profiles, and the degree of lateral contraction in the plastic zone at a crack tip. Based on crack tip opening displacement (CTOD) considerations, it is concluded that PIFCC is favored in alloys of low modulus and relatively low yield strength. In addition, a low strain-hardening rate such as for the 6061 alloy will favor PIFCC. Steels with a higher modulus and a higher strain-hardening rate than 6061 will, in general, exhibit RIFCC, even at comparable yield strength levels. In ferritic steels, the fracture surface roughness and consequently the crack-opening level will increase as the coarseness of the microstructure increases.

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Metadaten
Titel
On the Distinction Between Plasticity- and Roughness-Induced Fatigue Crack Closure
verfasst von
Sotomi Ishihara
Yuya Sugai
Arthur J. McEvily
Publikationsdatum
01.09.2012
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 9/2012
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-012-1121-9

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