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Gear PSN curve drawing method considering material inclusions and residual stress

A technology of PSN curve and residual stress, applied in instrumentation, geometric CAD, design optimization/simulation, etc.

Pending Publication Date: 2020-02-18
CHONGQING UNIV
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  • Description
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  • Application Information

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Problems solved by technology

This patent can determine the contact fatigue failure position of the gear under the condition of considering the crystal microstructure mechanics, but it fails to solve the problem that material inclusions and residual stress affect the contact fatigue life of the gear

Method used

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  • Gear PSN curve drawing method considering material inclusions and residual stress
  • Gear PSN curve drawing method considering material inclusions and residual stress
  • Gear PSN curve drawing method considering material inclusions and residual stress

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Experimental program
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Embodiment

[0046] Select gears such as Figure 5 Shown are the gears of the gearbox of a 2-megawatt wind turbine in service. This gear is an intermediate gear pair pinion, and the fatigue failure probability of this gear pair is significantly greater than other gears. Figure 5 On the right is the situation when fatigue failure occurs. The gear material is 18CrNiMo7-6 steel, which has been carburized, quenched and ground.

[0047] The material parameters of this material are as follows:

[0048]

[0049] The main parameters of the gear pair are as follows:

[0050]

[0051] Step 1. According to formula (1) and the main parameters of the gear pair, the radius of curvature in the two-dimensional circular contact model can be calculated as: pinion r 1 =50mm, big gear r 2 = 250.3mm, according to the radius of curvature, a two-dimensional circle contact model is established.

[0052] Step 2. Use the X-ray diffractometer to obtain the residual stress distribution of the gear along the depth direction...

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Abstract

The invention discloses a gear PSN curve drawing method considering material inclusions and residual stress. The gear PSN curve drawing method comprises: 1, establishing a two-dimensional plane strainfinite element model; 2, obtaining the distribution condition of residual stress in the depth directio is obtained through experiments; performing sampling through a Monte Carlo method to obtain a characteristic sample containing inclusions and residual stress characteristics on the sub-surface of the gear material; 3, importing the characteristic sample into a two-dimensional plane strain finiteelement model, and performing calculating by using ABAQUS to obtain a model sample stress-strain field of the rolling process under the same load; 4, calculating the predicted fatigue life of the model sample; and 5, repeating the step 3 and the step 4 by adopting at least four different loads to obtain model samples under the corresponding loads, and carrying out statistical analysis on the lifeprediction result of the samples to obtain a PSN curve. According to the method, tests are not needed, and the PSN curve of the gear material under different failure rates can be analyzed with low cost.

Description

Technical field [0001] The invention belongs to a method for predicting contact fatigue life of mechanical parts, and specifically relates to a gear PSN curve drawing considering material inclusions and residual stress. Background technique [0002] Contact fatigue failure is an important factor that restricts the performance of mechanical parts, and fatigue failure has become a key issue that needs to be resolved or improved in the development of the machinery industry. The problem of fatigue failure has been extensively studied. In order to reveal the law of fatigue failure, researchers have conducted extensive fatigue experiments, but fatigue experiments are time-consuming and laborious, and sufficient samples cannot be obtained. [0003] The SN curve is the basic fatigue performance curve of the material, and the PSN curve is the SN curve corresponding to different failure rates P drawn in consideration of the dispersion of fatigue life. To obtain the SN curve or PSN curve of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/17G06F119/14
CPCY02P10/20
Inventor 刘怀举张文博朱才朝
Owner CHONGQING UNIV
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