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WEI Guoqian, YUE Xudong, DANG Zhang, HE Yibin. S-N and IEFM combined fatigue life analysis for welded structures[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(2): 23-27.
Citation: WEI Guoqian, YUE Xudong, DANG Zhang, HE Yibin. S-N and IEFM combined fatigue life analysis for welded structures[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(2): 23-27.
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S-N and IEFM combined fatigue life analysis for welded structures

  • 1.

    Key Laboratory of Metallurgical Equipment and Control Technology(WUST), Ministry of Education, Wuhan 430081, China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering(WUST), Wuhan 430081, China;Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety, Wuhan 430205, China

  • 2.

    Key Laboratory of Metallurgical Equipment and Control Technology(WUST), Ministry of Education, Wuhan 430081, China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering(WUST), Wuhan 430081, China

  • 3.

    Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety, Wuhan 430205, China

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  • Received Date: February 04, 2015
    Graphical Abstract
    • Abstract
  • According to the evolution of fatigue cracks in welded structures, the fatigue life of welded structures was defined as the sum of crack initiation life Ni and crack propagation life Np, and the SN curve and fracture mechanics combined with fatigue life evaluating method was proposed. Equivalent structural stress method and the lower 99% boundary of master SN curve were utilized to evaluate the crack initiation life, and cracks at the end of the initiation stage was regarded as semi-elliptical surface crack. Paris Equation and the stress intensity factor range of semi-elliptical surface cracks were utilized to evaluate the crack propagation life. Fatigue test data of 5 crane runway girder specimens from a reference were utilized to the comparisons and Validation investigation. Result showed that equivalent structural stress can characterize the crack initiation state of complex welded structures well, and there is a good consistency between the calculating fatigue life and the test life.
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    • References (12)
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