The difficulty of providing the required strength characteristics of wheel locking joints is due to a complex stress state, the presence of stress concentrators, differences in contacting-part materials’ characteristics, and possible deviations in sizes from nominal values [1]. Providing stable strength characteristics and a low mass are important requirements. This paper suggests an approach to the strength-mass optimization of a disc and fir-tree joint of a high-pressure turbine and considers the scattering of dimensions within tolerances.
The main stages of optimization are shown, criteria for evaluating the robustness of the structure are proposed, and recommendations for the practical robust optimization of a real design are given. The results of various optimization approaches and strength-parameter dispersions of various configurations’ locking joints are compared. It is shown that decreasing the number of teeth increases the stability of the strength parameters.
