Method for predicting fatigue life of material based on wavelet packet analysis

A wavelet packet analysis and fatigue life technology, which is applied in the direction of applying repetitive force/pulsation force to test the strength of materials, can solve problems such as affecting the life result and stress loss, and achieve the effect of accurate estimation results

Active Publication Date: 2017-11-24
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology

[0007] The frequency domain method is mainly the Rayleigh distribution and the Dirlik algorithm. The Rayleigh distribution is suitable for narrowband signals, and the Dirlik algorithm is suitable for broadband signals. However, the frequency domain method must first generate PSD. In the process of generating PSD, some large instantaneous Stresses may be lost, which also affects lifetime results

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  • Method for predicting fatigue life of material based on wavelet packet analysis
  • Method for predicting fatigue life of material based on wavelet packet analysis
  • Method for predicting fatigue life of material based on wavelet packet analysis

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0051] Such as figure 1 Shown is a kind of prediction method of material fatigue life based on wavelet packet analysis provided by the present invention, comprises the following steps:

[0052] 1) Establish a sample model of the material, and calculate the stress power spectral density of the dangerous part in the sample model:

[0053] 11) Establish a sample model of the material, and apply an excitation signal to the sample model;

[0054] 12) Convert the excitation signal applied in step 11) into an acceleration frequency domain signal by Fourier transform;

[0055] 13) Calculat...

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Abstract

The invention relates to a method for predicting the fatigue life of a material based on wavelet packet analysis. The method comprises the following steps: establishing a sample piece model of the material and calculating stress powder spectrum density of a dangerous part in the sample piece model; according to the stress power spectrum density, obtaining time sequence under different frequency bands and the corresponding relation between each time sequence and the stress according to a wavelet packet analysis method; selecting the time sequence, with the maximal transient stress, in the time sequences under different frequency bands, and calculating by combining an S-N curve of the material to obtain the fatigue life of the material. Compared with the prior art, the method has the advantages of accurate prediction result, high practical performance, convenience in implementation and the like.

Description

technical field [0001] The invention relates to the field of fatigue life prediction, in particular to a method for predicting material fatigue life based on wavelet packet analysis. Background technique [0002] Fatigue life is a topic of great concern to designers and engineers. However, the calculation of fatigue life under complex fatigue loads is a very difficult problem. Because to calculate fatigue life, there must be accurate load spectrum, material properties or S-N curve of components, suitable cumulative damage theory, suitable crack growth theory, etc., and at the same time, some main factors affecting fatigue life must be taken into consideration. Up to this point, it is still very difficult. Therefore, at present, there is no very accurate method for fatigue life calculation at home and abroad, and only estimates or budgets can be made. [0003] At present, the calculation of fatigue life is mainly through the time-domain method and the frequency-domain meth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
CPCG01N3/32
Inventor 祁喜全王岩松郭辉赵礼辉刘宁宁王孝兰
Owner SHANGHAI UNIV OF ENG SCI
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