Modeling of Residual Stresses when Calculating the Strength of Lock Joint Elements. Part 2. The Effect of Residual Stresses on the Stress-Strain State of the Turbine Blade Root

Shot peening is used to increase the life of crucial parts of modern gas turbine engines and ground-based industrial engines. Currently, rational shot peening parameters are selected based on empiric methods. In this work, a computational technique for evaluating the influence of shot peening parameters on the stress-strain state of lock joint elements is presented. The results of calculations of the stress-strain state and cyclic durability of the turbine blade root are presented. A model of the turbine working wheel loaded with a nonuniform temperature field and centrifugal forces is calculated taking into account component-by-component graphs of residual stresses obtained using the technique described in Part 1 of this paper. To generate residual stress graphs, modeling of the shot peened area of the part is performed according to the manufacturing process used in the aircraft engine industry. The influence of the type of the residual stress graphs calculated at various shot peening parameters on the stress-strain state and cyclic durability of the turbine blade root is estimated. The application of the developed modeling technique will allow designers to choose the most favorable plot of the residual stresses and assign parameters of the turbine blade root strengthening based on the operating conditions of the working wheel.

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