Q345钢管焊接件的高周疲劳性能及多轴疲劳寿命预测

刘晖; 陈世超; 周飘

doi:10.13204/j.gyjzG201906200004

Q345钢管焊接件的高周疲劳性能及多轴疲劳寿命预测

doi: 10.13204/j.gyjzG201906200004

武汉理工大学道路桥梁与结构工程湖北省重点实验室, 武汉 430070

详细信息

作者简介:
刘晖,女,1972年出生,教授。电子信箱:drliuh@263.net

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出版历程
- 收稿日期: 2020-08-20
- 网络出版日期: 2021-06-04

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

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

摘要

摘要: 为了研究钢管焊接件的多轴高周疲劳性能，设计了钢管焊接试件的单轴拉伸和扭转高周疲劳试验，分析获得了钢管焊接件应力寿命曲线（S-N曲线）和疲劳参数，并在此基础上采用基于临界面理论的修正Wöhler曲线（MWCM）法对焊接件进行了多轴高周疲劳性能分析。结果表明：钢管焊接件的单轴高周疲劳性能远低于同等强度母材的疲劳性能；随着疲劳临界面正应力幅值和剪应力幅值比不断增大，疲劳寿命曲线不断下移，疲劳强度不断降低；当临界面上正应力幅值和剪应力幅值比不变时，多轴疲劳寿命随着临界面上剪应力幅值增大而降低；当临界面上剪应力幅值保持不变时，多轴疲劳寿命随着临界面上正应力幅值增大而降低。
- 钢管焊接件 /
- 拉伸高周疲劳试验 /
- 扭转高周疲劳试验 /
- 多轴高周疲劳 /
- 临界面法
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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