Turbine disc fatigue-creep reliability life evaluation method

Abstract

The invention relates to a method for evaluating the fatigue-creep reliability life of a turbine disc. The method comprises the following steps: S1, determining material attribute parameters, geometric parameters and a dispersity rule of the turbine disc; s2, sampling the material attribute parameters and the geometric parameters to generate M groups of samples; s3, performing finite element analysis to obtain a turbine disc stress-strain field; s4, obtaining the total fatigue-creep life of each group of samples; s5, establishing an XGBoost agent model; s6, re-sampling to obtain an expanded sample, and outputting the total fatigue-creep life of the expanded sample by using the XGBoost proxy model; and S7, carrying out reliability analysis on the fatigue-creep total life of all the samples to obtain the failure probability of the turbine disc. According to the method for evaluating the fatigue-creep reliability life of the turbine disc, the uncertainty of the material attribute of the turbine disc and the geometric dimension of the key position is considered, and therefore the failure probability of the turbine disc under the steady-state cycle number is obtained.

Description

technical field [0001] The invention relates to the field of material performance evaluation, and more particularly to a fatigue-creep reliability life evaluation method of a turbine disk. Background technique [0002] With the rapid development of the aerospace field, there is a higher demand for the comprehensive properties of materials. Aero-engine as the "heart" has a decisive influence on the success or failure of aerospace equipment development. The long-life and high-reliability structural design technology of high-temperature hot-end components such as turbine disks is one of the key technical bottlenecks restricting the development of aero-engines. [0003] The life and reliability of the high-temperature complex structures of major mechanical equipment (such as gas turbines and aero-engine hot-end components) are one of the main factors restricting the life and reliability of the whole machine. During the service process of major machinery and equipment, due to th...

AI Technical Summary

Problems solved by technology

However, in the actual structure, due to the inhomogeneity of the material, different batches of materials or turbine disks cannot guarantee complete and consistent material properties; at the same time, due to many uncertain factors such as the structural size, working load and external environment of the high-pressure turbine disk The impact makes it impossible to make accurate life predictions, so it is prone to biased results in practical applications

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