摘要
大型金属结构在高频动载作用下易发生疲劳破坏,影响结构的疲劳寿命。文中结合Miner线性累积损伤理论建立大型金属结构的疲劳寿命预测模型,以桥式起重机为研究对象,运用Ansys有限元软件对其主梁结构进行参数化建模,通过瞬态动力学分析获得随机应力谱,估算出主梁不同截面上的疲劳寿命,用有限截面上的若干代表性疲劳核算点处的寿命构成金属结构的疲劳寿命特征线,作为金属结构疲劳破坏路径的预判依据。
Large metal structures are prone to fatigue damage at high frequency dynamic loading, thus affecting the fatigue life. Combining Miner linear Cumulative damage theory, the study builds large metal structure＇ s fatigue life predic- tion model. Taking a bridge crane in a workshop for an example, the girder structure＇ s parametric modeling is carried out by using Ansys finite element software. Carrying on transient dynamics analysis to gain the random stress spectrum, the fa- tigue life of different cross-sections on the main girder can be obtained. Taking the fatigue life of a number of representative accounting point of limited cross-section into a curve, the fatigue life curve of metal structures is drawn, which can be the pre-estimation basis of metM structure fatigue damage path.
出处
《起重运输机械》
2016年第6期75-79,共5页
Hoisting and Conveying Machinery
基金
山西省自然科学基金(2015011059)
山西省研究生创新项目(2015SY66)
高等学校博士启动基金项目(20132006)资助
关键词
桥式起重机
高频动载
金属结构
随机应力谱
疲劳寿命特征线
bridge crane
high frequency dynamic load
steel structure
random stress spectrum
fatigue life curve
