钢桥面板疲劳裂纹全寿命周期扩展特性研究
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1.长沙理工大学;2.湖南工业大学

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基金项目:

国家重点研发计划项目(2021YFB2600900);国家自然科学基金(51908068、52178108);湖南省自然科学基金项目(2021JJ30720);长沙理工大学专业学位研究生“实践创新与创业能力提升计划”(SJCX202121)


Study on fatigue crack life cycle growth characteristics of steel bridge deck
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Affiliation:

1.Changsha University of Science &2.Technology;3.Hunan University of Technology

Fund Project:

National key research and development plan project (No.2021YFB2600900), National Natural Science Foundation of China (No. 51908068, 52178108), Hunan Natural Science Foundation Project (No.2021JJ30720), "Practice Innovation and Entrepreneurship Improvement Plan" for Professional Degree Postgraduates of Changsha University of Technology (No. SJCX202121)

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    摘要:

    正交异性钢桥面板的焊缝处微裂纹萌生,初始焊接缺陷是影响该类构造细节疲劳性能的关键因素。为研究正交异性钢桥面板顶板与纵肋连接焊缝的裂纹萌生与扩展的全寿命周期动态特性,基于断裂力学理论与ABAQUS-FRANC3D交互技术,研究了焊缝埋藏缺陷至疲劳断裂全过程应力强度因子的动态演化特征,揭示了裂纹的形状发展规律,分析了敏感参数对裂纹扩展速率与疲劳寿命的影响,明确了疲劳裂纹的全寿命扩展行为,并通过钢桥面板足尺节段疲劳试验验证研究结果的可靠性。分析结果表明:钢桥面板疲劳裂纹扩展行为可分为三个阶段:即埋藏阶段、萌生阶段、扩展阶段,沿裂纹不同路径的埋藏萌生阶段与扩展阶段的应力强度因子分布正好相反;任意初始形状的埋藏裂纹,随着不断扩展形状都趋近于圆形,任意形状的表面裂纹形状逐渐扁平,合理解释了表面裂纹持续扩展至贯穿顶板时吴扁平形态;埋藏阶段的裂纹沿上表面的扩展速率较下表面增大了54%,裂纹从埋藏萌生阶段进入扩展阶段后向顶板方向扩展速率较大;裂纹形态比a/c、埋藏深度对萌生寿命影响较大,其中萌生寿命在疲劳总寿命中占绝大部分。

    Abstract:

    The initial welding defect is the key factor that affects the fatigue performance of the structural details of the orthotropic steel bridge deck. In order to study the whole life cycle dynamic characteristics of crack initiation and propagation of the joint weld between the top plate and the longitudinal rib of the orthotropic steel bridge deck, based on the fracture mechanics theory and ABAQUS-FRANC3D interactive technology, the dynamic characteristics of the stress intensity factor in the whole process from the weld buried defect to the fatigue fracture were studied, the crack shape development law was revealed, and the influence of sensitive parameters on the crack growth rate and fatigue life was analyzed, The full life propagation behavior of fatigue crack is clarified, and the reliability of the research results is verified by the full scale segment fatigue test of steel bridge deck. The analysis results show that the fatigue crack growth behavior of steel bridge deck can be divided into three stages: burial stage, initiation stage, and propagation stage. The distribution of stress intensity factors in the buried initiation stage and the propagation stage along different crack paths is exactly opposite; Buried cracks of any initial shape tend to be round with continuous expansion, and surface cracks of any shape gradually flatten, which reasonably explains the flat shape of surface cracks when they continue to extend to the roof; The crack propagation rate along the upper surface of the buried stage is 54% higher than that on the lower surface. The crack propagation rate from the buried initiation stage to the roof direction is larger; The crack shape ratio a/c and buried depth have a great influence on the initiation life, and the initiation life accounts for the majority of the total fatigue life.

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  • 收稿日期:2022-12-23
  • 最后修改日期:2023-02-28
  • 录用日期:2023-03-15
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