Fatigue life analysis method for disc-shaft integrated blisk structure

A technology of fatigue life analysis and integral blisk, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of operability, accuracy and applicability, and meet the requirements of strong versatility, guaranteed life, Applicable effect

CN114139276APending Publication Date: 2022-03-04NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-04

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Abstract

The invention discloses a method for analyzing the fatigue life of a disc-shaft integrated blisk structure. The method comprises the following steps: obtaining a dangerous part, stress distribution and stress gradient distribution of the disc-shaft integrated blisk structure through a simulation analysis method; carrying out standard smooth sample and standard notch sample fatigue tests and normal-temperature and high-temperature material static tensile tests, and combining simulation analysis results and an influence factor correction method to obtain a material stress-fatigue life relationship considering average stress, stress gradient, temperature and other influence factors; and performing fatigue damage accumulation through a structural fatigue life analysis method to obtain the fatigue life of the disc-shaft integrated blisk structure. According to the method, test results, simulation analysis and a traditional fatigue analysis method are combined, and the method is simple, visual, clear in step and high in applicability. According to the invention, the service life requirements of the air turbine starter and the aero-engine can be ensured, and a sufficient and scientific service life assessment basis is provided for design and manufacturing of similar complex working components.
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Description

technical field

[0001] The invention belongs to the technical field of fatigue life analysis of engineering structures, and in particular relates to a fatigue life analysis technology of a disc-shaft integrated blisk structure, which provides a technical basis for fatigue damage analysis and fatigue life assessment of engineering machinery components under actual loads. An important step in the design and strength assessment of engineering complex structural components under actual service loads. Background technique

[0002] Air turbine starter is an important component of aircraft auxiliary power system. From the perspective of structural integrity and reliability, its safety will have an important impact on the overall safety performance of aeroengines. With the continuous development of aviation manufacturing technology, disc components gradually adopt the disc-shaft integrated structure, that is, the disc body, blades and wheel shaft are integrally processed and manufac...

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Embodiment Construction

[0062] The present invention will be further explained below in conjunction with the accompanying drawings.

[0063] The fatigue life analysis technology of the disc-shaft integrated blisk structure of the present invention obtains the dangerous parts, stress distribution and stress gradient distribution of the disc-shaft integrated blisk structure through the simulation analysis method; standard smooth samples, standard notch Specimen fatigue test and normal temperature, high temperature material static tensile test, combined with the simulation analysis results and the correction method of influencing factors, the material stress-fatigue life relationship considering the average stress, stress gradient, temperature and other influencing factors is obtained; and then through the structural fatigue life The analysis method is used to accumulate fatigue damage to obtain the fatigue life of the integral blisk structure.

[0064] The present invention will be further described be...