Arc end tooth structure rotor rupture rotation speed evaluation method

The invention provides an arc end tooth structure rotor rupture rotation speed evaluation method, which comprises the following steps of 1, performing linear elasticity finite element analysis by adopting a three-dimensional model at a reference rotation speed to obtain a finite element result; step 2, according to a result of the step 1, extracting a first principal stress, a temperature and a node coordinate of each node of the stress concentration part in the maximum principal stress gradient direction at the stress concentration part; 3, according to the sampling test data of the same batch of dissected parts at different temperatures, the actually measured tensile property and the actually measured material fracture toughness of the arc end tooth at the working temperature are obtained, and the characteristic length is determined; step 4, calculating effective stress in the characteristic length according to the characteristic length determined in the step 3 and a result in the step 2; and step 5, compar