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Fatigue design of axially-loaded high frequency mechanical impact treated welds by the effective notch stress method
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2014 (English)In: Materials and Design, ISSN 0261-3069, Vol. 58, 543-550 p.Article in journal (Refereed) Published
Abstract [en]

The effective notch stress method (ENS) as defined by the International Institute of Welding is widely used by design engineers to assess the fatigue strength of welded components. This paper provides a comprehensive evaluation of published data for welded joints improved by high frequency mechanical impact (HFMI) treatment. The goal is to verify already-known fatigue classes for the ENS with the available axially-loaded fatigue data. In total, 280 experimental test results obtained from longitudinal, cruciform and butt welds subject to stress ratio of R = 0.1 axial loading are evaluated. Notch stress concentration factors (K-n) for each joint geometry are analysed based on the finite element method. Calculated K-n and reported nominal stress values are used to determine local stresses. Fatigue strength assessment of the all available data is performed by the previously-proposed and verified correction procedure for yield strength (f(y)). A formerly-defined minimum K-n values as a function of f(y) is used for butt welds. The already-known fatigue classes are found to be conservative with respect to available fatigue test data.

Place, publisher, year, edition, pages
2014. Vol. 58, 543-550 p.
Keyword [en]
High frequency mechanical impact, Weld toe improvement, Fatigue strength improvement, High strength steels, Effective notch stress
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-144923DOI: 10.1016/j.matdes.2014.02.001ISI: 000333423900067ScopusID: 2-s2.0-84896509630OAI: diva2:715477

QC 20140505

Available from: 2014-05-05 Created: 2014-05-05 Last updated: 2014-05-05Bibliographically approved

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Marquis, Gary B.
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