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Fatigue crack three-dimensional expansion comparative analysis method for off-line CT detection condition

A technology for fatigue crack detection and detection conditions, which is applied in the direction of testing material strength by applying stable bending force and testing material strength by applying repetitive force/pulsation force, and can solve problems such as inconsistency

Active Publication Date: 2015-08-26
NANCHANG HANGKONG UNIVERSITY
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the current situation that rapid, accurate and continuous comparison and analysis of detection results cannot be performed due to inconsistencies in reconstructed images such as geometric scaling, rotation angle, and translation during offline CT detection in the process of fatigue crack growth, and to provide a CT scan A positioning device and a CT image registration method for different crack growth stages, on this basis, the single-pixel thickness crack growth surface incremental graphics are extracted to realize the comparative analysis of crack growth

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  • Fatigue crack three-dimensional expansion comparative analysis method for off-line CT detection condition
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  • Fatigue crack three-dimensional expansion comparative analysis method for off-line CT detection condition

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, the fatigue crack growth three-point bending fatigue sample 1 is processed by mechanical processing method, and the sample size is 60mm (length) × 5mm (width) × 5mm (height). A V-shaped notch 2 with a length of 5 mm × width of 1 mm × depth of 0.5 mm is processed by the spark method. The surface is polished with fine sandpaper, and the smoothness reaches above 7.

[0021] Such as figure 2 As shown, the CT scanning positioning device includes a disc 4 with a diameter of 40 mm, a disc 5 with a diameter of 20 mm, and a square hole 6 with a flat bottom. The center position of the upper surface of , the size is 5mm (length) × 5mm (width) × 10mm (depth), and the CT scanning positioning device is fixed at the center of the CT rotating table.

[0022] The three-point bending fatigue test was carried out on the three-point ben...

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Abstract

The invention discloses a fatigue crack three-dimensional expansion comparative analysis method for off-line CT detection condition. The fatigue crack three-dimensional expansion comparative analysis method comprises the following steps: (1) designing a three-point bending fatigue crack expansion test sample, processing, and performing three-point bending fatigue experiment; (2) designing a CT scanning positioning device; (3) performing microscopic CT scanning and reestablishment of the fatigue sample for different fatigue cycles under off-line conditions; (4) performing CT image registration alignment and image conversion on the fatigue sample in different fatigue cycles; (5) extracting crack body characteristics and extracting curved surfaces of middle positions of a crack body; (6) performing imaging and visualization on the increment of the crack expansion curved surface. The fatigue crack three-dimensional expansion comparative analysis method has the advantages that three-dimensional fatigue crack expansion comparative analysis can be achieved. The processing method is applicable to CT data comparative analysis in different expansion periods under off-line CT three-dimensional imaging detection conditions, can also be used for representing fatigue crack expansion behavior, and has significant guide meanings for advanced structural material crack expansion analysis and service life prediction.

Description

technical field [0001] The invention relates to a comparative analysis method for three-dimensional growth of fatigue cracks under off-line CT detection conditions, which analyzes the initiation and growth of fatigue cracks from three-dimensional situations, and belongs to the technical field of three-dimensional imaging representation of fatigue cracks. Background technique [0002] The essence of material fatigue is the initiation and growth of fatigue cracks. Fatigue cracks have the characteristics of easy growth, strong damage, great harm, and difficulty in detection. They have always been an important research content in the field of fatigue research. The determination of the location, size, distribution, shape and other information of fatigue cracks is the premise of crack growth analysis. Fatigue cracks have complex three-dimensional structure characteristics of thin layers, and their three-dimensional shape affects their propagation behavior. In order to obtain detail...

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Application Information

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IPC IPC(8): G01N3/20G01N3/32
Inventor 敖波卢鹏邓翠贞肖辉
Owner NANCHANG HANGKONG UNIVERSITY
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