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HU Xin, YAN Renjun, SHEN Wei, HU Yaoyu, HE Feng. Research on ⅡW multiaxial fatigue criterion based on notch stress approach[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185
Citation: HU Xin, YAN Renjun, SHEN Wei, HU Yaoyu, HE Feng. Research on ⅡW multiaxial fatigue criterion based on notch stress approach[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185

Research on ⅡW multiaxial fatigue criterion based on notch stress approach

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  • Received Date: January 03, 2019
  • Multiaxial fatigue strength evaluation of welded joints is a complex subject for engineering. Based on ⅡW multiaxial criterion, experimental data from published literatures were re-evaluated using notch stress approach. The results reveal that the uniaxial fatigue assessment S-N curve recommended by ⅡW is unfit for multiaxial fatigue. Whereas, the data points of proportional loading and non-proportional loading have good coincidence under notched stress system. The assessment result is dangerous when the number of cycles is in the range of 1×104 ~1×105, and it is too conservative over 1×105 times. Based on this, the S-N curve (FAT=430 MPa, m=5.8) with the probability of survival Ps=97.7% is proposed for both proportional and non-proportional loading. This work can provide useful references for fatigue life prediction of engineering welded structures.
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