利用Workbench软件，只考虑叶片受到的离心力,忽略气动力和轴的作用力，对实际叶轮进行有限元模拟，得到了正常加载和超速预加载过程的应力与应变分布规律，并与X射线衍射仪测定的真实叶片残余应力分布规律进行对比。结果表明: 两种加载情况下最大应力都出现在叶轮边缘，经过超速预加载后叶轮的最大应力减少了325 MPa,同时在整个超速预加载过程中等效塑性应变均不变。

The stress and strain distribution of actual centrifugal impeller under normal and over-speed preloading condition were obtained by Workbench software and compared with those measured by XRD, on condition that the aerodynamic and shaft force were ignored, and only the centrifugal force was considered. The results show that the maximum stress appeared on the edge of the impeller in both loading cases. The maximum stress of impeller under over-speed preloading condition decreased by 325 MPa, while the equivalent plastic strain didn’t change in the whole over-speed preloading process.