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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。
In order to obtain the high-cycle fatigue life of a MW class turbine hub QT350-22LT. The fatigue limit of the QT350-22LT is obtained by the pull-pull high-cycle fatigue test and the numerical simulation method is used to determine whether the QT350-22LT can be used as the hub material. The fatigue test was carried out in the PW3-10 program controlled high-frequency universal fatigue testing machine, and the pull-pull high-cycle fatigue test was carried out by using the actual cast test block. The experimental results show that the fatigue limit of QT350-22LT is about 250 MPa, and the inflection point of SN curve is 290 MPa based on the data. The location of the fatigue source is different, The difference. Finite element analysis of the maximum stress that the wheel itself can bear, the maximum stress is 156 MPa. The value of the stress concentration point does not exceed the fatigue limit of the material, which proves that the ductile iron QT350-22LT can meet the stress requirements of the fan hub design.