Method for analyzing damage tolerance of turbine blade interval

Abstract

The invention provides a method for analyzing the damage tolerance of a turbine blade interval in the case of lack of samples. Due to the correlation between some parameters in the crack structure, such as two crack propagation rate constants, and some parameters are independent parameters, such as load and crack size, a novel parallelepiped model was introduced into the method to measure the casewhere both the relevant interval parameters and the independent interval parameters were included. Through the parallelepiped model, most of the relevant interval parameters will be uniformly normalized into the independent standard hypercube. In the standard space, the subinterval analysis method is used to predict the upper and lower boundaries of the fatigue crack propagation life of the turbine blade. This method for analyzing the damage tolerance of a turbine blade interval can consider independent and related interval variables at the same time, solves the large uncertainty problem of parameters, and promotes the practical application of the uncertainty analysis of the damage tolerance of the turbine blade.

Description

technical field [0001] The invention relates to a turbine blade of an aero-engine, in particular to a damage tolerance analysis method for a turbine blade section based on a sub-interval method. Background technique [0002] Turbine blades are the core components of aero-engines, gas turbines, etc. They rotate at high speed under the action of high-temperature and high-velocity gas. The turbine blades are subjected to strong gas thrust and bending stress. Repeated frequent start-stop and variable-condition operation make Turbine blades are prone to fatigue fractures in an alternating stress environment, and it is very important to conduct damage tolerance analysis to ensure their safe operation. In the service environment, the blade is usually affected by uncertain factors, and the crack growth life is no longer a definite value. These uncertain factors must be taken into account in the damage tolerance analysis to ensure the safety of the structure. Probabilistic damage to...

AI Technical Summary

Problems solved by technology

Probabilistic damage tolerance can better make up for this defect, especially when it comes to the high-precision and high-cost structure of aero-engine turbine blades, but due to the lack of experimental data, it is usually difficult to construct an accurate probability density function of parameters for probabilistic damage tolerance analysis

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