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Fatigue assessment of high-frequency mechanical impact (HFMI)-treated welded joints subjected to high mean stresses and spectrum loading
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2015 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 38, no 10, 1167-1180 p.Article in journal (Refereed) Published
Abstract [en]

The fatigue strength of welded joints can be improved with various post-weld treatment methods. High-frequency mechanical impact treatment is a residual stress modification technique that creates compressive residual stresses at the weld toe. However, these beneficial residual stresses may relax under certain loading conditions. In this paper, previously published fatigue data for butt and fillet welded joints subjected to high stress ratios and variable amplitude cyclic stresses were evaluated in relation to the current International Institute of Welding (IIW) recommendations on fatigue strength improvement and a proposed IIW design guideline for high-frequency mechanical impact-treated welded joints. The evaluation showed that the current IIW recommendations resulted in both non-conservative and overly conservative fatigue strength estimations depending on the applied stress level, whereas the proposed fatigue assessment guideline fitted the current data well.

Place, publisher, year, edition, pages
[Mikkola, E.; Marquis, G.] Aalto Univ, Dept Appl Math, Espoo 02150, Finland. [Dore, M.] TWI, Integr Management Grp, Cambridge CB21 6AL, England. [Khurshid, M.] KTH, Dept Aeronaut & Vehicle Engn, SE-10044 Stockholm, Sweden., 2015. Vol. 38, no 10, 1167-1180 p.
Keyword [en]
fatigue improvement, high-frequency mechanical impact (HFMI), mean stress, variable amplitude loading
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-174212DOI: 10.1111/ffe.12296ISI: 000360763400003ScopusID: 2-s2.0-84940874255OAI: diva2:861361

QC 20151016

Available from: 2015-10-16 Created: 2015-10-02 Last updated: 2015-10-16Bibliographically approved

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