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Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method

An electromechanical impedance and ultrasonic guided wave technology, applied in material impedance and other directions, can solve the problems of damage location, the difficulty and disadvantage of quantitative damage detection, achieve flexible detection and diagnosis, and improve damage detection capabilities.

Active Publication Date: 2015-05-06
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] However, there are some problems in the above two methods: due to the characteristics of multi-mode and dispersion of ultrasonic guided wave or Lamb wave, the echo signal in a complex structure will be more complicated, and it is difficult to analyze and process the signal. Quantitative detection of damage is difficult; for the impedance method, the higher the scanning frequency, the more sensitive it is to damage, but the detection area is correspondingly smaller, which is not conducive to damage location

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  • Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method

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[0039] Step 1: Take a piece such as figure 2 The shown aluminum plate specimen (dimensions: 1000mm×1000mm×3mm), respectively set a hole and a notch on it, and the coordinates of the two are as follows: figure 2 shown. Among them, the diameter of the hole is 20mm, while the length of the notch is 30mm and the width is 1.5mm. Select N (24 in this example) different positions (L1, L2, ..., L24) on the aluminum plate as detection points, and their distribution is as follows figure 2 shown;

[0040] Step 2: According to the embodiment steps in the Chinese invention patent (application number 201410020701.1) applied by the inventor, a large-area structural damage detection method based on Lamb wave, the image of the test result of the guided wave method of the test piece is obtained, as shown in image 3 shown;

[0041] Step 3: According to the image of the damage diagnosis result of the guided wave, adjust the threshold and select the area E to be detected as the fine inspec...

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Abstract

The invention discloses an ultrasonic guided wave and electromechanical impedance-based mobile damage detection method. The method comprises the following steps: based on the ultrasonic guided wave and electromechanical impedance technologies, firstly scanning and positioning a structural damage by adopting a wave guiding method, and evaluating the damage status by adopting an electromechanical impedance method. The damage detection method combines an ultrasonic guided wave damage detection method and an electromechanical impedance-based damage detection method so as to give play to the advantages of the two and make up the disadvantages of each other; and the method comprises the following steps: firstly, scanning and positioning a structural damage based on guided wave to determine the non-destructive area and a to-be-detected area E, then respectively moving a probe to the non-destructive area and the to-be-detected area E, so that the details of the damage status can be obtained by dry coupling electromechanical impedance characteristic of a mobile probe, and the detection capability of the damage can be greatly improved.

Description

technical field [0001] The invention relates to a structural damage detection method, in particular to a mobile damage detection method based on ultrasonic guided waves and electromechanical impedance. Background technique [0002] Engineering structures such as aircraft, civil engineering, and heavy machinery are subjected to complex load conditions for a long time and may even suffer unexpected impacts during their service. It is necessary to detect structural damage in time and regularly evaluate the integrity of the structure to prevent huge losses caused by structural failure. . In recent years, damage detection methods based on guided waves (usually called Lamb waves in plate and shell structures) and electromechanical impedance have been widely used in the field of nondestructive testing. The above two methods are sensitive to damage on the surface or inside of the structure, and each has its own characteristics. For the damage detection method based on guided waves...

Claims

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Application Information

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IPC IPC(8): G01N27/02
Inventor 武湛君郑跃滨刘科海高进王奕首
Owner DALIAN UNIV OF TECH
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