Gear contact fatigue life prediction method based on load spectrum

A contact fatigue and life prediction technology, applied in instruments, complex mathematical operations, calculations, etc., can solve the problem of not considering the multi-axial stress state, and achieve the effect of saving test costs, improving accuracy, and improving efficiency

Active Publication Date: 2019-08-20
CHONGQING UNIV
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Problems solved by technology

[0008] Aiming at the existing fatigue life prediction technology, which uses the S-N curve of the material and does not consider the shortcomings of the multi-axis str

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  • Gear contact fatigue life prediction method based on load spectrum
  • Gear contact fatigue life prediction method based on load spectrum
  • Gear contact fatigue life prediction method based on load spectrum

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0026] Such as figure 1 Shown, the present invention comprises the following steps:

[0027] Step 1. Compile the load spectrum for the finite load-time history obtained from the measurement. Based on the statistical results of the rainflow counting method, use the parameter extrapolation method to perform function fitting on the load of the entire life cycle to obtain the second load of the entire life cycle. dimensional load spectrum;

[0028] Step 1.1. Perform rainflow counting processing on the load-time history, remove small loads, divide the loads into a rainflow matrix with an amplitude-average value of 20×20, and obtain the frequency relationship between the average load value and the load amplitude value.

[0029] Taking the automobile reducer as an example:

[0030] Perform rainflow counting processing on the load-time history at the output end, r...

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Abstract

The invention discloses a gear contact fatigue life prediction method based on a load spectrum. The gear contact fatigue life prediction method comprises the following steps: 1, compiling a load spectrum for limited load-time history obtained by measurement, and performing function fitting on the load of the whole life cycle by utilizing a parameter extrapolation method through a statistical result of a rain flow counting method to obtain a two-dimensional load spectrum of the whole life cycle; 2, converting the two-dimensional load spectrum into a one-dimensional load spectrum; 3, simulatingthrough a finite element method to obtain a time-varying stress-strain process of the gear, predicting the contact fatigue life under a constant load by combining a multi-axis fatigue criterion, and drawing the contact fatigue S-N curve of the gear; 4, calculating the contact fatigue life of the gear under the load spectrum according to the Palmgmn-Miner fatigue damage accumulation criterion. Themethod has the advantages that the accuracy of predicting the contact fatigue life of the gear is improved, the test cost is saved, and the efficiency is improved.

Description

technical field [0001] The invention belongs to a method for predicting the fatigue life of mechanical components. Background technique [0002] The failure of gear transmission is mainly the failure of gear teeth. Among all the failure modes of gear teeth, fatigue and broken teeth account for the largest proportion, followed by surface contact fatigue. Therefore, fatigue damage is one of the most important forms of gear failure. Due to the long test period Moreover, the cost is high, and with the development of computer technology, the future development trend of gear life prediction is to use virtual fatigue analysis to predict fatigue life. [0003] Document "Finite element analysis of contact fatigue and bending fatigue of a theoretical assembling straight bevel gear pair[J]". Deng S, Hua L, Han XH, et al. Journal of Central South University, 2013,20(2):279- 292. (“Finite Element Analysis of Contact Fatigue and Bending Fatigue of Spur Bevel Gear Pairs under Theoretical ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/18
CPCG06F17/18G06F2119/04G06F30/17G06F30/23
Inventor 刘怀举贾攀朱才朝
Owner CHONGQING UNIV
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