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System and method for positioning fatigue crack in plate like structure based on ipsilateral ultrasonic mixing wavelet

A technology of fatigue cracks and frequency mixing, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and processing detection response signals. It can solve problems such as undiscovered patent documents and achieve Good for reference, improve utilization rate, and reduce waste

Inactive Publication Date: 2020-01-17
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the search of published patent documents, no published patent documents identical to this patent application have been found

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  • System and method for positioning fatigue crack in plate like structure based on ipsilateral ultrasonic mixing wavelet
  • System and method for positioning fatigue crack in plate like structure based on ipsilateral ultrasonic mixing wavelet

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Embodiment Construction

[0030] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0031] A system for locating fatigue cracks in plate structures based on the same-side ultrasonic mixing wavelet. 14, a duplexer 15, a high-pass filter 6 and an oscilloscope 9, the computer is connected to the nonlinear ultrasonic instrument, the nonlinear ultrasonic instrument is provided with two radio frequency output terminals and one radio frequency input terminal 12, and the two radio frequency output terminals include the first The radio frequency output terminal 10 and the second radio frequency output terminal 11, the first radio frequency output terminal and the second radio frequency output terminal are respectively connected with a left side attenuator 1 and a right side attenuator 2, and the left side attenuator and the right sid...

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Abstract

The invention relates to a system for positioning a fatigue crack in a plate like structure based on ipsilateral ultrasonic mixing wavelet, and the system comprises a computer, a non-linear ultrasonicinstrument, an attenuator, a low-pass filter, a signal excitation sensor, a sample piece under test, a duplexer, a high-pass filter and an oscilloscope. The invention also relates to a method for positioning a fatigue crack in a plate like structure based on ipsilateral ultrasonic mixing wavelet, and the method comprises the following steps of 1) system build; 2) regulation of the excitation signal; 3) transmission of the excitation signal; 4) signal processing; and 5) positioning of the fatigue crack. The invention is scientific and reasonable, can fast and accurately determine the locationof the fatigue crack in the plate like structure, reduce the waste caused by early replacement of the material not containing damaged structure, improve the utilization rate of materials, and avoid safety accidents caused by the failure to timely find the existence of the damaged structure, and, in addition, has very good reference value for the research of forecasting residual life of the metal materials.

Description

technical field [0001] The invention belongs to the field of metal non-destructive testing, and relates to a system and method for locating fatigue cracks in plate structures based on same-side ultrasonic mixing wavelets. Background technique [0002] Metal sheets are widely used in military, industrial, medical and aerospace fields. During use, materials will inevitably be affected by external factors such as repeated loads, temperature changes, and corrosion, which will cause fatigue. When fatigue accumulates to a certain extent It will develop into macroscopic cracks, causing safety accidents and major economic losses. [0003] At present, there are four mature methods for non-destructive testing of metals: ultrasonic flaw detection, which mainly detects metallurgical defects, such as slag inclusions, holes, cracks, etc.; X-ray flaw detection, which detects high-density inclusions in parts, such as tungsten inclusions, etc. Defects; fluorescent penetrant testing method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/48G01N29/44G01N29/04G06F30/20
CPCG01N29/041G01N29/4472G01N29/48
Inventor 李一博王晢芮小博綦磊刘嘉玮
Owner TIANJIN UNIV
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