Turbine mortise shot blasting discrete element-finite element coupling multi-scale simulation method

Abstract

The invention relates to a turbine mortise shot blasting discrete element-finite element coupling multi-scale simulation method which comprises the following steps: (1) cutting a mortise structure tobe researched according to the symmetry of the mortise structure, and endowing a constitutive model with a high strain rate; (2) setting the relative positions of a nozzle and the mortise according tothe actual process condition, defining the size and angle of the nozzle, and completing the modeling of the mortise and the nozzle; (3) acquiring dislocation evolution model parameters based on the stress-strain data under the high strain rate, establishing a dislocation evolution model of the mortise material, and associating the grain size, the dislocation density and the macroscopic stress-strain; (4) defining a particle generator * Particle by using a DEM module, setting bullet parameters, combining the mortise with the nozzle, and setting contact characteristics between pellets and the mortise; and (5) carrying out numerical simulation, and obtaining surface integrity parameters after mortise structure strengthening.

Description

technical field [0001] The invention is a discrete element-finite element coupling multi-scale simulation method for turbine tenon and groove shot peening, which is a method capable of efficiently and accurately simulating the shot peening strengthening effect of a turbine tenon and groove structure, and belongs to the technical field of aerospace engines. Background technique [0002] Shot peening technology is currently the most mature and widely used surface strengthening technology in the aviation industry. It uses high-speed projectile jets to collide with the surface of the structure, introduces a considerable residual stress field, changes the surface morphology and produces controllable plastic deformation. The tenon and groove of the turbine has been in high temperature, high pressure and high speed environment for a long time, and the service environment is harsh, which can easily induce fatigue problems. Therefore, the application of shot peening on the tenon and g...

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Problems solved by technology

[0003] At present, the research on the shot peening of the turbine tenon and groove is basically based on the test, but if the residual stress, roughness and microstructure are detected for the geometrically complex structure of the turbine tenon and groove, the test cost is relatively high

Moreover, the number of tests is limited, and it is impossible to test all shot peening parameters

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