Surface fatigue crack detecting method based on CCD image characteristic

A technology of fatigue cracks and image features, which is applied in the direction of optical testing for defects/defects, can solve the problems of cumbersome implementation, expensive equipment, and the need to contact samples, and achieve the effects of fast detection speed, low cost, and improved accuracy

Inactive Publication Date: 2009-04-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The purpose of the present invention is to propose a surface fatigue crack detection method based on CCD image features in view of the problems of expensive equipment, cumbersome implementation, and the need to contact samples in the existing fatigue crack detection method

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  • Surface fatigue crack detecting method based on CCD image characteristic
  • Surface fatigue crack detecting method based on CCD image characteristic
  • Surface fatigue crack detecting method based on CCD image characteristic

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] Such as Figure 1-4 shown.

[0046] A kind of image detection method of surface fatigue crack, it comprises the following steps:

[0047] Step 1: Carry out fatigue crack growth test on the sample and collect digital images;

[0048] Sample such as figure 1 As shown, the clamping scheme is as follows figure 2 shown. Using self-designed image acquisition system (such as image 3 (shown) to collect (continuously collected during the whole test process or regularly collected at regular intervals) images of the surface fatigue crack growth process, and analyze the surface fatigue cracks using the surface replica method to obtain the length of each stage of the surface fatigue crack growth, according to The number of vibrations of the fatigue testing machine and the corresponding surface fatigue crack length, the length growth curve (a-N curve and...

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Abstract

The invention discloses a method used for detecting surface fatigue crack with CCD image characteristic, aiming at the defects that the existing fatigue crack detection method has low precision, needs the contact with the samples, needs expensive equipment and is troublesome to execute, and the like. The method utilizes the MATLAB image processing technology to research the characteristic parameters (length and width) used for characterizing the surface fatigue crack extension, compares two characterization methods, and validates the precision of the method used for detecting the surface fatigue crack images. The method has the advantages of high precision, non-contact type, simple equipment, easy execution, and the like, can realize the intellectualized malfunction diagnosis, and provides guiding suggestions for practical production.

Description

technical field [0001] The invention relates to a detection method for surface fatigue cracks, in particular to a detection method for surface fatigue cracks which combines digital image technology and MATLAB analysis technology, specifically a detection method for surface fatigue cracks based on CCD image features. Background technique [0002] With the rapid development of modern science and technology, there are more and more occasions where industrial equipment is required to be used under conditions such as high temperature, high pressure, and high speed, and the alternating stress it bears is getting higher and higher, and the problem of fatigue damage is becoming more and more prominent. The fatigue damage of mechanical parts is the main factor leading to the damage of its structural strength, and the fatigue crack is the main form of fatigue damage. Under the action of alternating stress, microscopic cracks will initiate in components, especially the main stressed co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
Inventor 左敦稳莫国影丁子昀黎向锋陈兴峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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