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A turbine blade probability damage tolerance analysis method

A turbine blade, damage tolerance technology, applied in the field of aero-engine structural safety

Active Publication Date: 2019-06-14
HUNAN UNIV
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Problems solved by technology

Aiming at the strong nonlinearity of the blade crack growth life model and the large uncertainty and correlation between parameters, the present invention proposes a probabilistic damage tolerance analysis method for turbine blades to predict the fatigue growth life distribution

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  • A turbine blade probability damage tolerance analysis method
  • A turbine blade probability damage tolerance analysis method
  • A turbine blade probability damage tolerance analysis method

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Embodiment Construction

[0074] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0075] Step 1: Firstly, a deterministic three-dimensional crack growth analysis is carried out on the turbine blade. The overall finite element model of the blade and the local sub-model after the crack is introduced are as follows: figure 1 Shown: The model is 75.8mm long, 43.6mm wide, and 15.4mm thick. The finite element model contains 96287 C3D10 elements, 143824 nodes, the initial crack size is 0.5mm, the thrust is 544.1N, and the bending moment is 400Nm. The blade material is AISI450 steel, the crack growth rate constant C is 2.0349e-8, m is 3.45, and the fracture toughness is K IC for The invention uses the combination of Abaqus and Franc3d to analyze the deterministic crack growth of the turbine blade. Firstly, the global model of the blade is analyzed by Abaqus to ...

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Abstract

The invention provides a turbine blade probability damage tolerance analysis method. According to the method, the problems of strong nonlinearity of a blade crack propagation life model, large uncertainty and correlation among parameters and the like are solved, and the fatigue crack propagation life distribution of the turbine blade can be predicted only according to the parameter distribution. The method comprises that firstly, a crack propagation life model is logarithmic; Nataf change and orthogonal change are utilized to convert the related random variables into independent normal randomvariables, then two-dimensional dimension reduction integration is utilized to solve the first four-order moment of the crack propagation life, and finally the probability density function (PDF) and the cumulative distribution function (CDF) of the crack propagation life are solved based on the maximum entropy principle (MEP). The method can predict the fatigue crack propagation life distributionof the turbine blade and guide the evaluation of the detection period of the turbine blade.

Description

technical field [0001] The invention belongs to the field of aero-engine structural safety, and in particular relates to a probabilistic damage tolerance analysis method for turbine blades. Background technique [0002] Turbine blades are the core components of gas turbines and aero-engines. They rotate at high speed under the action of high-temperature, high-pressure, and high-velocity gas. The turbine blades are subjected to strong gas thrust and bending stress. Fatigue fracture is prone to occur in an alternating stress environment, and damage tolerance analysis is crucial to ensure its safe operation. In the service environment, the blade is usually affected by uncertain factors, and the damage tolerance analysis based on deterministic fracture mechanics is often difficult to describe the crack growth behavior in the real crack structure. In order to evaluate the reliability of the remaining strength of the blade structure more accurately and ensure the safety of the bl...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 龙湘云刘凯姜潮
Owner HUNAN UNIV
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