Fatigue strength evaluation of Q460 weld joints based on energy dissipation

WEI Wei; SUN Yibo; YANG Guang; SUN Yang; YANG Xinhua

doi:10.12073/j.hjxb.20200907001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(4): 49-55. > DOI: 10.12073/j.hjxb.20200907001

WEI Wei, SUN Yibo, YANG Guang, SUN Yang, YANG Xinhua. Fatigue strength evaluation of Q460 weld joints based on energy dissipation[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(4): 49-55. DOI: 10.12073/j.hjxb.20200907001

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Fatigue strength evaluation of Q460 weld joints based on energy dissipation

WEI Wei^{1, 2,},
SUN Yibo^{1, 2},
YANG Guang^{1, 2},
SUN Yang^{1, 2},
YANG Xinhua^{1, 2, ,}

1.
Materials Science Institute of Dalian Jiaotong University, Dalian 116028, China
2.
Liaoning Key Laboratory of Welding and Reliability of Rail Transportation Equipment, Dalian 116028, China

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Received Date: September 06, 2020
Available Online: March 28, 2021

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Abstract

Abstract

Traditional temperature-based fatigue strength prediction method, fail to reveal the irreversible energy dissipation behind the fatigue evolution. For the fatigue strength evaluation of Q460 welded joints, a new fatigue strength prediction method, which is based on the energy dissipation of different load levels that exists the turning point, was proposed, i.e. maximum slope method. The energy dissipation was firstly established based on the obtained real-time thermographic data of the specimen surface, and then the energy dissipation value of Q460 welded joints were calculated. Based on the theory of the energy dissipation turning point exists when the load level increases, the energy dissipation was set as an index for rapid fatigue strength estimation. To verify the accuracy of the developed model, the fatigue strength value estimated by the maximum slope method was compared with the predicted value by the traditional bi-linear and staircase methods. The results show that a good agreement is reached between the predicted fatigue strength by the maximum slope method and the traditional bi-linear and staircase methods, and the errors are 0.04% and 4.76%, respectively, which may provide a certain reference for fatigue strength prediction of welded joints.
- maximum slope method,
- welded joints of Q460,
- energy dissipation,
- fatigue strength

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References (25)

References

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