Method for analyzing damage tolerance of turbine blade interval

A technology of turbine blades and analysis methods, applied in the field of turbine blades, can solve problems such as lack of experimental data

Inactive Publication Date: 2018-11-23
HUNAN UNIV
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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

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  • Method for analyzing damage tolerance of turbine blade interval
  • Method for analyzing damage tolerance of turbine blade interval

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Embodiment Construction

[0056] Aiming at the lack of samples, the invention proposes an interval analysis method for the crack propagation life. Since in the crack structure, some parameters are correlated, such as two crack growth rate constants, while some parameters are independent parameters, such as load and crack size, etc., a novel parallelepiped model is introduced in the method to simultaneously contain It is measured when the relevant interval parameters contain independent interval parameters. Through the parallelepiped model, most of the relevant interval parameters will be unified and normalized into an independent standard hypercube. In this standard space, the upper and lower boundaries of the fatigue crack growth life of the turbine blade are predicted by using the subinterval analysis method.

[0057] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0058] Step 1: Firstly, a deterministic three-dimensional...

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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...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/04G06F30/20Y02T90/00
Inventor 姜潮龙湘云刘凯李玮鹏
Owner HUNAN UNIV
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