Fatigue crack tip automatic detection method and system capable of adapting to various surface states
A technology for automatic detection of fatigue cracks, applied in image analysis, instruments, calculations, etc., can solve problems such as difficult automatic detection of crack tips, and achieve the effect of overcoming the high requirements and limitations of the surface state of materials
Pending Publication Date: 2022-08-09
DALIAN UNIV OF TECH
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[0005] The purpose of the present invention is to provide an automatic detection method and system for fatigue crack tips that can adapt to various surface states, and solve the problem that it is difficult to automatically detect crack tips under different surface states during fatigue crack growth experiments.
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[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0038] The purpose of the present invention is to provide a fatigue crack tip automatic detection method and system that can adapt to various surface states, so as to solve the problem that it is difficult to automatically detect the crack tip under different surface states during the fatigue crack propagation experiment.
[0039] In order to make the above objects, features and advantages of the present invention more clearly understo...
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The invention relates to a fatigue crack tip automatic detection method and system capable of adapting to various surface states, and relates to the field of crack detection.The method comprises the steps that an initial image of the surface of a to-be-detected material is acquired and recorded as a first image; acquiring a fatigue crack propagation image of the surface of the to-be-detected material as a second image; performing pixel point subtraction on each image of the second image and the first image to obtain a difference value set; obtaining a threshold value of each group of difference values in the difference value set; obtaining crack growth points at different moments according to the threshold value; acquiring a main direction and an auxiliary direction of crack propagation; and the crack growth points at different moments are screened in the main direction and the auxiliary direction, and crack tip coordinates are obtained. According to the invention, the problem that crack tips are difficult to automatically detect in different surface states in the fatigue crack propagation experiment process can be solved.
Description
technical field [0001] The invention relates to the field of crack detection, in particular to a fatigue crack tip automatic detection method and system which can adapt to various surface states. Background technique [0002] Metal fatigue means that under the action of alternating stress, after a period of time, tiny cracks are formed in local high stress areas, and then the tiny cracks expand and break. It is of great significance to study the mechanical properties of materials and optimize the structural design of components to carry out fatigue crack growth experiments, observe and record the crack growth status in real time, and know the position of the crack tip. Among the existing technical methods, traditional manual detection methods such as direct reading method, flexibility method, potentiometric method, and flaw detection method are widely used, but such methods have low degree of automation and low detection efficiency. [0003] The basic principle of the stati...
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CPCG06T7/001G06T2207/10004G06T2207/30136
Inventor 李佳琦朱殿立赵延广阎军张崴孙士勇樊俊铃杨鹏飞
Owner DALIAN UNIV OF TECH