A simplified fatigue assessment method for high quality welded cruciform joints

T. Nykänen, G. Marquis*, T. Björk

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review


    The primary goal of this study was to develop an equation relating the geometric parameters to fatigue strength which can be used is routine design assessment. To attain this, the influence of local geometrical weld variations on the fatigue strength of non-load-carrying cruciform fillet welded joints were systematically studied using plane strain linear elastic fracture mechanics (LEFM). The effects of weld toe radius, flank angle and weld size were considered. Both continuous weld toe cracks and semi-elliptical toe cracks with alternate pre-existing defect depths were considered. A previously developed experimental crack aspect ratio development curve was used for assessing the growth of the semi-elliptical cracks using 2D FE models. A total of 152 experimental fatigue data points from six published studies of welded cruciform joints were evaluated. Details of the actual weld toe radius, flank angle and weld size were available for these joints. For the high quality welds evaluated, an assumed initial crack depth of 0.05 mm was found to correlate best with the experimental data. Of all the geometric parameters considered analytically, weld toe radius was found to have the most dramatic influence on fatigue life. A simple equation is proposed which relates welded joint fatigue strength to the ratio weld toe radius/plate thickness for high quality welds. (C) 2008 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)79-87
    Number of pages9
    Issue number1
    Publication statusPublished - Jan 2009
    MoE publication typeA1 Journal article-refereed
    EventInternational Conference on Fracture and Damage Mechanics - Madeira, Portugal
    Duration: 17 Jul 200719 Jul 2007
    Conference number: 6


    • Welded joints
    • Fatigue strength
    • Fatigue crack growth
    • Weld profile
    • Fatigue assessment
    • CRACKS


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