A method for predicting that detail life of a structure under high-low cycle fatigue load

A low-cycle fatigue and structural detail technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as unreliable fatigue life analysis results, personal injury, property loss, etc., to shorten the development cycle and reduce Development cost and the effect of expanding the scope of application

Active Publication Date: 2019-02-15
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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Problems solved by technology

In traditional research, the high-low-cycle composite load fatigue problem of the structure is generally simply decomposed into high-cycle fatigue problem or low-cycle fatigue problem for research, which will get an unreliable fatigue life analysis result, which may cause serious property damage. loss or personal injury
During the working process of aircraft and engine, the structure is alternately subjected to

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  • A method for predicting that detail life of a structure under high-low cycle fatigue load
  • A method for predicting that detail life of a structure under high-low cycle fatigue load
  • A method for predicting that detail life of a structure under high-low cycle fatigue load

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Embodiment Construction

[0024] In order to make the purpose, technical solution and advantages of the application more clear, the technical solution in the embodiment of the application will be described in more detail below in conjunction with the drawings in the embodiment of the application.

[0025] The life prediction method of structural details under high-low cycle composite fatigue loads proposed in this application is based on the Ye Duyi model of cumulative damage theory, and the high-cycle influence term is introduced to realize the life prediction of structural details under high-low cycle composite fatigue loads and solve the high-cycle influence Items should satisfy basic boundary conditions and have the required parameters for the problem.

[0026] Such as Figure 1 to Figure 4 , the life prediction method of structural details under high and low cycle composite fatigue loads of the present application includes the following steps:

[0027] Step 1: Determine the structure or material ...

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Abstract

The invention discloses A method for predicting that detail life of a structure under high-low cycle fatigue load which includes such steps as determining the low cycle fatigue stress level of the structure material, obtain the S-N curve, and one of the low cycle fatigue stress levels is selected as the low cycle fatigue stress level sigma L; determining Then the high and low cycle fatigue test conditions, and the S-N curve, acquiring the relationship curve between high cycle fatigue life and amplitude. Then, setting up the fatigue life prediction model of the modified parameters to be determined, and obtaining the modified parameters in the model are determined and the fatigue life prediction model. Finally, determining the fatigue life under the load conditions that need to be evaluated.The present application is independent of the specific form of the structure and the loading condition, and can be used for fatigue life prediction of key structural details in aircraft structures, shortening model development cycles, and reducing development costs.

Description

technical field [0001] The application belongs to the technical field of material fatigue life prediction, and in particular relates to a method for predicting the life of structural details under the action of high-low cycle composite fatigue loads. Background technique [0002] Fatigue is one of the most important causes of aircraft structure failure and damage, and it widely exists in machinery, vehicles, welded structures, aircraft engines and other structures. The loss of personnel and economic loss caused by the failure of engineering structures caused by fatigue problems is huge. Therefore, the study of fatigue problems can not only improve the reliability and economy of engineering structures, but also ensure the safety of personnel. In traditional research, the high-low-cycle composite load fatigue problem of the structure is generally simply decomposed into high-cycle fatigue problem or low-cycle fatigue problem for research, which will get an unreliable fatigue li...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F2119/04Y02P90/30
Inventor 刘璟琳单兴业何刚
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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