Optimization design and validation of ceramic matrix composite turbine dovetail strength process

We research the optimal design method of SiC_f/SiC ceramic matrix composite (CMC) turbine dovetail. Firstly, the geometrical shape optimization is carried out based on the multiscale damage analysis and the stress distribution characteristics of the turbine dovetail. The optimization results indicated a 31.8% improvement in the strength performance of the CMC dovetail. Then, considering the fibre distribution in the platform and dovetail regions, three corresponding lay-up design schemes were proposed. Based on the simulation results and performance preparation methods, the optimal lay-up scheme was determined. The experimental result showed the maximum tensile strength of the dovetail is 147.18 MPa, and the error is 5% compared with the simulation result, which indicates the accuracy of the optimized design method.