Finite element analysis method based on influences of matrix cracks for gear engagement features

A finite element and crack technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inaccurate calculations, errors, ignoring the influence of substrate cracks and gear strain, etc., to achieve accurate calculation results and reduce effect of error

Active Publication Date: 2017-12-08
NORTHEASTERN UNIV
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Problems solved by technology

However, there are the following deficiencies: (1), the analytical method is mainly aimed at the study of tooth root cracks, due to the complexity of non-penetrating matrix cracks, the analytical method cannot effectively calculate the damage of the matrix crack to the gear matrix; (2), the same , the finite element method mainly focuses on the research on tooth root crack

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  • Finite element analysis method based on influences of matrix cracks for gear engagement features
  • Finite element analysis method based on influences of matrix cracks for gear engagement features
  • Finite element analysis method based on influences of matrix cracks for gear engagement features

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[0051] Example 1

[0052] A finite element analysis method of gear meshing characteristics considering the influence of matrix cracks, such as figure 1 As shown, including the following steps:

[0053] Step 1: Obtain the basic parameters of the gear pair of the driving wheel and the driven wheel and the crack parameters of the gear with the matrix crack; in this embodiment, the basic parameters of the gear pair and the crack parameters of the gear with the matrix crack are obtained as shown in Table 1:

[0054] Table 1 Basic parameters of gear pairs and crack parameters of gears with matrix cracks

[0055]

[0056] In this embodiment, the crack starting position angle ψ and the crack width L c Keep unchanged, crack depth q 0 Change in 5mm~25mm, crack width L c Change between 5mm~25mm;

[0057] Step 2: Establish a finite element model of the gear with matrix cracks, the crack form is a parabolic non-penetrating matrix crack;

[0058] Step 2.1: Use the APDL function of ANSYS software to bu...

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Abstract

The invention relates to a finite element analysis method based on influences of matrix cracks for gear engagement features. The method includes the steps of obtaining basic parameters of gear pairs of a driving gear and driven gears and crack parameters of matrix crack gears; according to the basic parameters of the gear pairs, building a three-dimensional finite element model of a well functioning gear, incising a gear matrix to generate a finite element gear model containing matrix cracks; conducting mesh refinement on the crack surfaces, and creating a surface-to-surface contact unit Conta 174 and a surface-to-surface contact unit Targe 170 on the crack surfaces under the interaction among the crack surfaces; according to the crack parameters, calculating the gear engagement features and the difference between the calculation results, wherein the difference is resulted from whether or not the contact units are created on the crack surfaces. The finite element method based on the influences of the matrix cracks for the gear engagement features can make the calculation results of engagement stiffness and tooth root strain of the crack gears more accurate and is conducive to understanding of interaction between engagement features of non-penetrable matrix crack gears and crack surfaces, and the researching results can provide certain reference for gear design.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and in particular relates to a finite element analysis method for gear meshing characteristics considering base cracks. Background technique [0002] Gear is an important mechanical transmission part, but due to manufacturing errors, poor lubrication, overload, stress concentration and other reasons, cracks will appear on the gear. Cracks will propagate not only along the teeth, but also along the gear matrix. In the prior art, a large number of studies on the meshing characteristics of cracked gears have been carried out by using analytical methods and finite element methods. However, there are the following deficiencies: (1), the analytical method is mainly aimed at the study of tooth root cracks, due to the complexity of non-penetrating matrix cracks, the analytical method cannot effectively calculate the damage of the matrix crack to the gear matrix; (2), the same , the finite e...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06
Inventor 马辉段田堂李占伟闻邦椿张学良
Owner NORTHEASTERN UNIV
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