基于等效裂纹法的桥(门)式起重机箱形梁疲劳寿命估算

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英文篇名：FATIGUE LIFE PREDICTION OF BOX GIRDER OF BRIDGE BASED ON EQUIVALENT CRACK APPROACH 作者：罗友红 ; 吴晓 ; 丁正男 ; 冯晓华 英文作者：LUO YouHong;WU Xiao;DING ZhengNan;FENG XiaoHua;School of Mechanical Engineering,Southwest Jiaotong University; 关键词：起重机 ; 箱形梁 ; 等效裂纹 ; 疲劳寿命 ; 估算 英文关键词：Crane;;Box girder;;Equivalent crack;;Fatigue life;;Estimation 中文刊名：JXQD 英文刊名：Journal of Mechanical Strength 机构：西南交通大学机械工程学院; 出版日期：2018-02-08 出版单位：机械强度 年：2018 期：v.40;No.195 基金：四川省科技支撑计划项目(2014HH0022)资助~~ 语种：中文; 页：JXQD201801034 页数：5 CN：01 ISSN：41-1134/TH 分类号：203-207

摘要

针对起重机箱形梁结构及其受力情况复杂的特点,提出了一种以疲劳试验数据为基础的等效裂纹法来估算疲劳寿命。疲劳试验数据能够很好反映结构疲劳危险处的应力集中影响。箱形梁疲劳危险点处的应力集中影响可以大概等效为一未焊接平板上具有一等效裂纹,并用Paris公式计算等效裂纹的扩展寿命。通过将该方法的估算结果与文献中的疲劳试验结果进行对比分析,文中方法对于常幅载荷作用下的疲劳寿命估算是有效可行的,而对于变幅载荷作用下的疲劳寿命估算还有待进一步研究。
        According to the characteristics of structure of the crane box girder and its complex stress condition,an equivalent crack approach based on fatigue test data is presented to estimate the fatigue life. The fatigue test data can be well in reflecting the effect of stress concentration on fatigue risk points. The stress concentration effects at the fatigue dangerous location can be approximately equivalent to having a crack in an unwelded plate. Using paris law calculate the equivalent crack propagation. By comparing estimation results with fatigue test results in the literature,the proposed method is effective and feasible to estimate the fatigue life under constant amplitude loading,but it needs to be further researched for estimation fatigue life under variable amplitude loading.

引文

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