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Citation: WANG Xudong, HUANG Zhenghua, HAN Han. Prediction of Fatigue Crack Initiation Life of Unstiffened CHS Steel Tube X-Joints Under Quasi-Static Loading[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(5): 83-89,225. doi: 10.13204/j.gyjzG21070802

Prediction of Fatigue Crack Initiation Life of Unstiffened CHS Steel Tube X-Joints Under Quasi-Static Loading

doi: 10.13204/j.gyjzG21070802
  • Received Date: 2021-07-08
    Available Online: 2022-07-23
  • Publish Date: 2022-07-23
  • To obtain the fatigue crack initiation life of unstiffened CHS X-joints under quasi-static loading, nine groups of unstiffened joints with different geometric parameters were numerically simulated. The hybrid strengthening model of steel and the cyclic hole growth model (CVGM) were used to predict the fatigue crack initiation life of unstiffened X-joints under quasi-static loading and various equal amplitude reciprocating loads. According to the orthogonal design test theory, parametric analysis was carried out on the influencing factors of fatigue crack initiation life (diameter ratio of branch pipe to main pipe β, diameter-thickness ratio of main pipe γ) of unstiffened X-joints. The results showed that the larger the diameter ratio of branch pipe to main pipe, the smaller the crack initiation life of unstiffened X-joints. The larger the diameter-thickness ratio of the main pipe, the longer the crack initiation life of the unstiffened X-joints is. Finally, based on the parametric analysis results of crack initiation life, an empirical formula for predicting the fatigue crack initiation life of unstiffened X-joints under quasi-static loading was proposed.
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