Design method of low-contact-stress tenon connection structure under size constraint

The invention relates to the technical field of turbine blade tenon connection structures, and discloses a low-contact-stress tenon connection structure design method under size constraint, which comprises the following steps of: determining a tooth crest arc under the size constraint of a tenon connection structure size boundary, a working face contour and a non-working face contour; and according to the determined tooth crest arc, a working face switching arc and a non-working face switching arc are determined. The design method is easy to understand, the operation process is simple, under the condition that it is guaranteed that the length of the linear section of the contact face is not changed, the three-section arc switching and arc radius matching design is adopted, the more and more prominent contradiction between the tenon connection structure size constraint and the low contact stress requirement is solved, and the advanced aero-engine development requirement can be met. Under the condition that the