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Transmission gear fatigue life assessment method based on defect modeling

A fatigue life, transmission gear technology, applied in the field of fatigue life evaluation of transmission gears based on defect modeling, can solve the problems of not meeting the actual engineering application standards, and can not reasonably consider the impact of crack fatigue life, etc., to achieve fast remanufacturing Effects of reusability judgment, improvement of fatigue analysis efficiency, and complexity reduction

Inactive Publication Date: 2014-03-05
GUANGXI UNIV
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AI Technical Summary

Problems solved by technology

However, the traditional fatigue life analysis is carried out under the assumption that there are no defects, and the influence of cracks on fatigue life cannot be reasonably considered; while the crack growth life theory of fracture mechanics is still in the initial stage of development, and cannot meet the standards for practical engineering applications.

Method used

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  • Transmission gear fatigue life assessment method based on defect modeling
  • Transmission gear fatigue life assessment method based on defect modeling
  • Transmission gear fatigue life assessment method based on defect modeling

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with accompanying drawing.

[0046] Such as figure 1 As shown, the fatigue life analysis method of transmission gears based on defect modeling in the present invention analyzes the geometric characteristics of cracks, parametrically expresses them and introduces them into the dangerous section of the tooth root, and uses the fatigue life analysis method based on local stress to perform fatigue life evaluation. , the specific steps are as follows:

[0047] (1) Analyze the dangerous cross-section where root cracks are most likely to occur

[0048] The dangerous section of the tooth root described in the present invention is based on the attached figure 2 It is determined by the 30° tangent line theory shown above. A point on the center line of the gear tooth is used as a tangent line to the root fillet, and the direct connection line between the two tangent points is the dangerous section.

[0049] (...

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Abstract

The invention discloses a transmission gear fatigue life assessment method based on defect modeling. The method includes the following steps that (1), crack occurrence rules and reasonable crack forms are analyzed, and the method for introducing cracks into a gear model is researched; (2), material fatigue characteristic parameters are obtained through test data fitting or a numerical value estimation method; (3), a stress spectrum under the condition of working situations of a gear containing the cracks is calculated by using a finite element method, and the stress spectrum is corrected according to obtaining conditions of the material fatigue characteristic parameters; (4), fatigue life under the condition of working situations of a gear containing the cracks is calculated by using the reasonable fatigue damage accumulation theory. The fatigue life assessment method based on defect modeling is provided for the transmission gear, and an effective detection basis is provided for the remanufacturing process of a gear recycled part.

Description

technical field [0001] The invention relates to a method for evaluating the fatigue life of transmission gears with tooth root cracks, in particular to a method for evaluating the fatigue life of transmission gears based on defect modeling. Background technique [0002] During the remanufacturing process of the transmission gear, due to the complex surface profile of the gear, the existing surface repair technology cannot meet its repair needs. Therefore, the key to the remanufacturing of the gear is to evaluate the reusability of the recovered gear parts and screen out the remaining life through non-destructive testing. Recycled parts with more than one working cycle are processed in the remanufacturing process. [0003] In practice, the non-destructive testing technology of remanufacturing engineering can only obtain the distribution of defects and geometric characteristic parameters through testing, and cannot directly estimate the remaining life of the recovered gear par...

Claims

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Application Information

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IPC IPC(8): G01M13/02
Inventor 余清
Owner GUANGXI UNIV
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