A Modified Loading Method for Separating the Effect of Residual Stress on Fatigue Crack Growth Rate of Welded Joints

Yaowu Xu, Rui Bao, Hao Liu, Xiang Zhang

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    10 Citations (Scopus)
    91 Downloads (Pure)

    Abstract

    A novel loading method is proposed to remove the effect of residual stress on measured fatigue crack growth rate in welded joint, using which the influence of empirical crack growth rate correlation equations on the results can be avoided. The total stress intensity factor range and the effective stress ratios corresponding to the combined effect of applied and residual stress are kept constant during the fatigue crack growth test, by changing the applied maximum and minimum loads with the increase of crack length and changes in residual stress based on the superposition rule. The feasibility of the proposed method was validated by tests of compact tension specimens containing residual stresses introduced by four-point bending. The loading method was then applied to a test of welded compact tension specimen with coupled effect of residual stress and microstructure change on fatigue crack growth rate. The fluctuation in the separated crack growth rate reflects the effect of microstructure change on fatigue crack growth rate.
    Original languageEnglish
    Pages (from-to)1227–1239
    Number of pages13
    JournalFatigue and Fracture of Engineering Materials and Structures
    Volume40
    Issue number8
    Early online date8 May 2017
    DOIs
    Publication statusPublished - Aug 2017
    Event16th International Conference on New Trends in Fatigue and Fracture - Dubrovnik, Croatia
    Duration: 24 May 201627 May 2016
    Conference number: 16

    Bibliographical note

    This is the peer reviewed version of the following article: Xu, Y, Bao, R, Liu, H &
    Zhang, X 2017, 'A Modified Loading Method for Separating the Effect of Residual
    Stress on Fatigue Crack Growth Rate of Welded Joints' Fatigue and Fracture of
    Engineering Materials and Structures, vol 40 (8), 1227–1239, which has been published in final form at http://dx.doi.org/10.1111/ffe.12617. This
    article may be used for non-commercial purposes in accordance with Wiley Terms
    and Conditions for Self-Archiving.

    Keywords

    • Fatigue crack growth
    • weld joints
    • superposition rule
    • residual stress

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