HIGH-CYCLE FATIGUE PERFORMANCES AND MULTIAXIAL FATIGUE-LIFE PREDICTION FOR WELDED STEEL PIPES OF Q345

LIU Hui; CHEN Shichao; ZHOU Piao

doi:10.13204/j.gyjzG201906200004

Volume 51 Issue 2

Jun. 2021

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LIU Hui, CHEN Shichao, ZHOU Piao. HIGH-CYCLE FATIGUE PERFORMANCES AND MULTIAXIAL FATIGUE-LIFE PREDICTION FOR WELDED STEEL PIPES OF Q345[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(2): 166-170. doi: 10.13204/j.gyjzG201906200004

Citation:

LIU Hui, CHEN Shichao, ZHOU Piao. HIGH-CYCLE FATIGUE PERFORMANCES AND MULTIAXIAL FATIGUE-LIFE PREDICTION FOR WELDED STEEL PIPES OF Q345[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(2): 166-170. doi: 10.13204/j.gyjzG201906200004

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HIGH-CYCLE FATIGUE PERFORMANCES AND MULTIAXIAL FATIGUE-LIFE PREDICTION FOR WELDED STEEL PIPES OF Q345

doi: 10.13204/j.gyjzG201906200004

Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070, China

Received Date: 2020-08-20
Available Online: 2021-06-04

Abstract

Abstract

In order to explore the multiaxial high-cycle fatigue performances of welded members of steel pipe, the uniaxial tensile and torsional high-cycle fatigue tests of welded members of steel pipe were designed to obtain the stress-life curve (S-N curve) and fatigue parameters of welded members of steel pipe. On this basis, the modified Wöhler curve method(MWCM) based on critical surface theory was adopted to analyze the multiaxial high-cycle fatigue performances of welded members.The results showed that the uniaxial high-cycle fatigue performances of welded members of steel pipe was much lower than that of base metal with the same strength. With the increase of the ratio of normal stress amplitude to shear stress amplitude on fatigue critical plane, the fatigue life curve kept moving downward and the fatigue strength decreased. When the ratio of normal stress amplitude to shear stress amplitude on the critical plane remained constant, the multiaxial fatigue life decreased with the increase of shear stress amplitude on the critical plane. When the shear stress amplitude on the critical plane remained unchanged, the multiaxial fatigue life decreased with the increase of the normal stress amplitude on the critical plane.
- welded members of steel pipe,
- tensile high-cycle fatigue test,
- torsional high-cycle fatigue test,
- multiaxial high-cycle fatigue,
- critical plane method

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References

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