兆瓦级风电轮毂球铁高周疲劳寿命研究  

Investigation of High Cycle Fatigue Life of MW Grade Wind Turbine Ductile Iron Hub

作　　者：刘佳[1] 曲迎东[1] 李荣德[1] 马广辉[1] 白彦华[1] 姜珂[1] 邱克强[1] 尤俊华[1] 王瑞春[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110178

出　　处：《铸造》2012年第5期461-463,470,共4页Foundry

基　　金：辽宁省教育厅创新团队项目(LT2010075);辽宁省科技计划项目(NO.2009221005);沈阳市科技攻关项目(F10-035-2-00);沈阳市科技攻关项目(F11-069-2-00)

摘　　要：为了获得MW级风机轮毂QT350-22LT的高周疲劳寿命。通过拉-拉高周疲劳试验获得其疲劳极限,并通过数值模拟的方法确定QT350-22LT是否能够作为轮毂材料。疲劳试验在PW3-10程序控制高频万能疲劳试验机进行,采用实际生产的附铸试块进行拉-拉高周疲劳试验。试验结果表明:获得的兆瓦级风电轮毂QT350-22LT的疲劳极限值为250 MPa,根据数据绘制的S-N曲线的拐点在290 MPa;疲劳源的位置不同,所产生的瞬断区断口形貌也有所差别。对轮毂本身所能承受的最大应力进行有限元分析,得到最大应力为156 MPa。应力集中部位的值没有超过材料的疲劳极限,这证明球铁QT350-22LT能够满足风机轮毂设计的应力要求。The main purpose of this paper is to obtain high cycle fatigue life of MW grade the wheel hub（QT350-22 LT）.Through the pull-pull high cycle fatigue tests,the fatigue limit is determined.The numerical simulation method was used to determine whether QT350-22 LT is able to be the hub material or not.The fatigue test equipment and materials are PW3-10 program control high frequency universal fatigue test machine and the practical production casting blocks,respectively.The results show that fatigue limit of the MW grade wind turbine hub QT350-22 LT is 250 MPa and inflection point of S-N curve draw according to data is 290 MPa;the morphologies of the transient breaking fracture are different due to the different crack sources.The maximum tensile stress of the hub is 156 MPa,which is obtained by the finite element analysis.The value of tensile stress concentration position is no more than the fatigue limit of the material,which proves that the ductile iron hub（QT350-22 LT） can satisfy the design requirement of stress.

关 键 词：风电轮毂 球墨铸铁 S-N曲线 疲劳极限 有限元分析 

分 类 号：TG255[金属学及工艺—铸造]