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Flaw detection method for corrugated plate

A corrugated plate and fundamental wave technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, instruments, etc., can solve problems such as no flaw detection method, second harmonic cycle change

Active Publication Date: 2022-05-06
CHONGQING IND POLYTECHNIC COLLEGE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Then, during the propagation of the Lamb wave fundamental wave, the newly generated second harmonic will interfere with the previously generated second harmonic, which will lead to the phenomenon of periodic change of the second harmonic on the wave propagation path
[0006] Although the second harmonic detection technology has many advantages, there are also many difficulties that need to be overcome
At present, there is no accurate flaw detection method for this type of corrugated sheet

Method used

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  • Flaw detection method for corrugated plate
  • Flaw detection method for corrugated plate
  • Flaw detection method for corrugated plate

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Embodiment 1

[0039] Introduction to the principle of structural quasi-phase matching technology:

[0040] The present invention is based on the basic principle proposed by the inventor for the first time in this patent, which the inventor calls: Structural Quasi-Phase Matching Technical Principle, referred to as SQPM. Before introducing the embodiments, a related introduction will be made to the structural quasi-phase matching technology.

[0041] According to the literature "X.Sun, X.Ding, F.Li, S.Zhou, Y.Liu, N.Hu., Z.Su, Y.Zhao, J.Zhang, M.Deng, Interaction of Lamb Wave Modes with Weak Material Nonlinearity: Generation of Symmetric Zero-Frequency Mode, Sensors, 18(2018) 2451" shows that the solution of the second harmonic is:

[0042]

[0043] P mn (when m=n) is not zero, indicating that the mth order propagation mode is along direction propagation, and are the energy flow flowing into the m-th order propagating mode from the surface and inside of the thin plate, respectively...

Embodiment 2

[0090]The difference between this embodiment and Embodiment 1 is that the ultrasonic probe in this embodiment (mainly referring to the receiving point) includes: a housing 1, a CMUT sheet 4, an acoustic lens 3 and a controller; the CMUT sheet 4 includes multiple a CMUT element; the acoustic lens 3 is located on the surface of the CMUT sheet 4; the bottom surface of the CMUT sheet 4 is provided with a liner layer 7, the liner layer 7 is bonded to the CMUT sheet 4, and the liner layer 7 and the acoustic lens 3 are respectively Located at the top and bottom of the CMUT sheet 4; the CMUT sheet 4 is connected to the flexible substrate 2 through a wire; the flexible substrate 2 is electrically connected to the controller (the flexible substrate 2 is also connected to the controller with an external power lamp and other equipment); the housing 1 is provided with a piezoelectric ceramic sheet 5, and the piezoelectric ceramic sheet 5 is provided with an electrode 6 with opposite polarit...

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Abstract

The invention belongs to the field of early damage detection of plates, and particularly relates to a flaw detection method for a corrugated plate, which comprises the following steps: S1, acquiring parameters of the corrugated plate; s2, fundamental wave parameters are determined, and the fundamental wave frequency of the corresponding corrugated plate is selected according to the parameters of the corrugated plate; s3, damage detection: transmitting a fundamental wave at a signal excitation point of the corrugated plate, generating a second harmonic in the corrugated plate by the fundamental wave, and receiving a second harmonic signal at a signal receiving point of the corrugated plate; s4, performing damage analysis. According to the scheme, the influence of the boundary of the corrugated plate on the ultrasonic phase is utilized, and the limitation of the phase velocity matching condition is overcome through reasonable frequency selection, so that the secondary harmonic energy is continuously increased on the whole, and further the nonlinear ultrasonic nondestructive testing of the early damage of the corrugated plate structure is realized.

Description

technical field [0001] The invention belongs to the field of early damage detection of plates, and in particular relates to a flaw detection method for corrugated plates. Background technique [0002] Due to internal factors (alternative transfer of energy inside the plate) and external factors (external load, temperature change, corrosion), the plate and shell structure will inevitably gradually degrade in material properties, the bearing capacity will decrease, damage will occur, and the damage will accumulate to a certain extent. Rapid development leads to catastrophic accidents. Therefore, timely prediction and location of material performance changes and damages are crucial to ensure the normal operation of equipment and the safety of people's lives and property. [0003] Compared with other traditional detection methods, ultrasonic detection has the advantages of safety, no radiation, no pollution, no additional damage, and short detection time. Ultrasonic testing is...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/041G01N2291/023
Inventor 孙晓强张晋源
Owner CHONGQING IND POLYTECHNIC COLLEGE
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