A Discrete Element-Finite Element Coupling Multiscale Simulation Method for Turbine Tenon and Groove Shot Peening

Abstract

The invention relates to a discrete element-finite element coupling multi-scale simulation method for turbine tenon-groove shot peening. The steps are as follows: (1) cutting the to-be-researched tenon-groove structure according to the symmetry of the tenon-groove structure, and endowing it with a high strain rate constitutive model ; (2) Set the relative position of the nozzle and the groove according to the actual process, define the size of the nozzle and the angle of the nozzle, and complete the modeling of the groove and the nozzle; (3) Obtain the parameters of the dislocation evolution model based on the stress-strain data under high strain rate, Establish the dislocation evolution model of the tenon and groove material, and correlate the grain size, dislocation density and macroscopic stress and strain; (4) use the DEM module to define the particle generator *Particle, set the projectile parameters, combine the tenon and groove with the nozzle, and set the projectile (5) Carry out numerical simulation to obtain the surface integrity parameters after strengthening of the tenon and groove structure.

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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