Notched test piece based meshing gear bending fatigue limit evaluation method and device

A technology of bending fatigue and meshing gears, which is applied in the calculation of bending fatigue strength of gears and the evaluation of bending fatigue limit of meshing gears, which can solve the problems of complex gear processing procedures, long production cycle, large time and cost, etc.

Inactive Publication Date: 2015-01-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the gear processing process is complicated, the production cycle is long, and the geometric parameters such as

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  • Notched test piece based meshing gear bending fatigue limit evaluation method and device
  • Notched test piece based meshing gear bending fatigue limit evaluation method and device
  • Notched test piece based meshing gear bending fatigue limit evaluation method and device

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Embodiment Construction

[0081] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0082] Such as figure 1 As shown, the present invention provides a method for estimating the bending fatigue strength of meshing gears based on notched specimens, the method comprising:

[0083] S101: Create a gear solid model according to gear-related parameters including gear modulus, number of teeth, and width, assign elastic-plastic material properties to the gear, perform mesh division, establish contact properties of the gear opposite surfaces, apply bou...

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Abstract

The invention discloses a notched test piece based meshing gear bending fatigue limit evaluation method and device. The method includes the steps of 1), establishing meshing gear pair finite element models; 2), establishing finite element models of notched test pieces; 3), determining stress concentration factors of model root portions in the step 1), and establishing relation curves of the stress and the depth of tooth surfaces; 4), determining stress concentration factors at the positions of notches of the test pieces in the step 2), and establishing relation curves of the stress and the depth of notched surfaces; 5), comparing consistency of the stress concentration factors in the steps 3) and 4) with the overlap ratio of the relation curves, repeating the step 4) and determining final geometric parameters and fatigue limit load of the notched test pieces; 6), determining the length of inherent cracks of materials; 7), performing modeling on gears of optional dimensions, repeating the steps of 3), 4) and 5), and determining the geometric parameters and load features of the corresponding notched pieces; 8), establishing gear bending fatigue limit estimation models; 9), establishing equivalent stress relation of the notched test pieces and the gears and determining gear bending fatigue lives.

Description

technical field [0001] The invention relates to a calculation technology for gear bending fatigue strength, in particular to a method for evaluating the bending fatigue limit of meshing gears based on a notch test piece, and belongs to the field of structure evaluation and test testing. Background technique [0002] Gears are the main body of power transmission, and tooth bending fatigue is the most common fatigue failure mode in gears. Determining the bending fatigue strength of gears has become an important basis for gear anti-fatigue design. [0003] The existing methods for evaluating the bending fatigue limit of gears mainly include the traditional method and the finite element method. The traditional method is mainly based on the calculation method of bending stress in material mechanics, and evaluates the tooth root stress from the perspective of cantilever beam equivalent and coefficient correction, which has a great approximation. The conventional finite element me...

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Application Information

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IPC IPC(8): G06F19/00G01M13/02
Inventor 李伟邓海龙孙振铎张震宇张晓航
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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