Study of the static strength of a ceramic blade inserted in a gas turbine metal disk

The use of ceramic turbine blades can increase the efficiency of gas turbine engines due to the increased operating gas temperature at the combustion chamber outlet and the reduced air consumption for cooling the blades, as well as significantly reduce the weight of parts due to the low density of ceramics. The main disadvantage of ceramic parts is the fragility of the material, which limits their durability. In this study, the static strength of a herringbone-type interlock between a low-pressure turbine wheel and hot-pressed OTM-914 blades is studied. Two designs of blades made of high-strength hot-pressed silicon nitride and a heat-resistant nickel alloy are analyzed. To evaluate the bearing capacity of a ceramic blade root, a calculation method based the finite element method and the brittle fracture criterion is proposed. The results of research show that the interlock structure must be optimized to ensure the required strength of ceramic blades. This study improves our knowledge about the application of ceramic materials in advanced gas turbine engines.

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