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Date of Publication:2014-01-01

Journal:船海工程

Issue:4

Page Number:38-42,46

ISSN No.:1671-7953

Abstract:Based on the self-equilibrium feature of nonlinear distribution stress in welding , the equivalent hot spot stress can be defined at a point ( called zero point ) in plate thickness direction where nonlinear distribution stress due to the notch effect of the weld is equal to zero .With the combination of MWCM ( Modified W?hler Curves Method ) based on principle of critical plane, a new approach for the multi-axial fatigue strength assessment of complex welded joints is proposed .The change trend of zero point is investigated by numerical calculation to get a fitting equation for determining the zero point position .The published fatigue tests data and numerical stress results of some welded joints are used for accuracy verification of the proposed equivalent hot spot stress approach .The equivalent hot spot stress approach is verified to be consistent with the current hot spot stress ap -proach and also have higher accuracy for being able to consider the thickness effect on the fatigue strength to a certain extent .It can be used to estimate the multi-axial fatigue strength of welded joints .

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