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基于XFEM钢桥面板-U肋焊缝疲劳裂纹扩展规律及其影响因素分析 被引量:1

Fatigue Crack Propagation and Influencing Factors of Steel Bridge Deck and U-rib Weld Based on XFEM
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摘要 目的研究正交异性钢桥面板与U肋焊缝在循环荷载作用下萌生于焊趾、焊跟处的疲劳裂纹扩展规律及影响因素。方法基于扩展有限单元法(XFEM),利用ABAQUS有限元软件建立了3U肋正交异性板数值分析模型,通过引入初始裂纹长度、面板厚度、应力比三个变量参数,分析评价这些参数变化对焊趾、焊跟处的疲劳裂纹扩展规律及疲劳寿命影响程度。结果初始裂纹长度由0.5 mm增加至1.5 mm、面板厚度由14 mm增加至20 mm、应力比由0.1增加至0.8时,焊趾处裂纹疲劳寿命分别减少46.6%、提高797%、提高364%,焊跟处裂纹疲劳寿命分别减少51.2%、提高425%、提高351%。结论XFEM能准确预测面板与U肋焊缝疲劳细节的疲劳裂纹扩展路径及其疲劳寿命;初始裂纹长度越长、面板厚度和应力比越小,疲劳裂纹的扩展速率愈快、相应的疲劳寿命越小。 The fatigue crack propagation and influencing factors of the weld between orthotropic steel bridge deck and U-rib initiated at the weld toe and heel under cyclic load is studied.Based on the extended finite element method(XFEM),the numerical analysis model of 3U rib orthotropic plate is established by using ABAQUS finite element software.By introducing three variable parameters of initial crack length,panel thickness and stress ratio,the influence of these parameters on fatigue crack propagation law and fatigue life at weld toe and heel is analyzed and evaluated.When the initial crack length increases from 0.5 mm to 1.5 mm,the panel thickness increases from 14 mm to 20 mm,and the stress ratio increases from 0.1 to 0.8,the crack fatigue life at the weld toe decreases by 46.6%,797% and 364%respectively,and the crack fatigue life at the weld heel decreases by 51.2%,425% and 351% respectively.XFEM can accurately predict the fatigue crack propagation path and fatigue life of the fatigue details of the panel and U-rib weld;The longer the initial crack length and the smaller the panel thickness and stress ratio,the faster the fatigue crack propagation rate and the smaller the corresponding fatigue life.
作者 王占飞 韩迎秋 何志成 王维 WANG Zhanfei;HAN Yingqiu;HE Zhicheng;WANG Wei(School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Zhuhai Communication Engineering Technology Co.Ltd.,Zhuhai,China,519060;China State Construction Railway Investment&Engineering Group Co.Ltd.,Beijing,China,102627)
出处 《沈阳建筑大学学报(自然科学版)》 CAS 北大核心 2023年第4期689-698,共10页 Journal of Shenyang Jianzhu University:Natural Science
基金 国家自然科学基金重点项目(51938009)。
关键词 正交异性钢桥面板 疲劳细节 扩展有限元 疲劳裂纹扩展 疲劳寿命 orthotropic steel bridge deck fatigue details extended finite element method(XFEM) fatigue crack propagation fatigue life
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