Metal material crack quantitative monitoring method based on ultrasonic guided wave

A metal material, ultrasonic guided wave technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of inability to determine the size and direction of cracks, low detection efficiency, shutdown detection, etc., to achieve quantitative real-time monitoring, monitoring range The effect of large and large detection range

Active Publication Date: 2019-06-18
招商中特智检(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, magnetic particle testing is limited by the particle size of the magnetic powder, and can only detect surface cracks with a certain opening width; eddy current testing can only detect surface and near-surface cracks, and is not sensitive to deep-buried cracks; X-ray detection objects are usually volumetric damage ; Ultrasonic echo detection needs to scan the structure, the detection efficiency is low, and the reliability is not high when detecting closed cracks
In addition, during the implementation of the above detection methods, most of the external loads of the components to be tested are required to be released in advance, which affects the normal

Method used

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  • Metal material crack quantitative monitoring method based on ultrasonic guided wave
  • Metal material crack quantitative monitoring method based on ultrasonic guided wave
  • Metal material crack quantitative monitoring method based on ultrasonic guided wave

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Experimental program
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Embodiment 1

[0055] Based on the correlation analysis method and the damage path probability imaging method, the invention analyzes the ultrasonic guided wave signal of the metal material plate structure, and realizes the quantitative evaluation of cracks.

[0056] The sensor uses piezoelectric ceramics (PZT), and multiple sensors form a circular or square sensor network, such as figure 1shown. The sensor is bonded to the tested board structure by epoxy glue. A professional ultrasonic guided wave monitoring system is used to generate excitation signals and collect monitoring signals. Each sensor is used as an excitation, and the rest of the sensors are used as receivers to collect signals. The excitation signal is a modulated 5-peak narrow-band sine wave signal, see formula 1.

[0057]

[0058] Among them, A is the amplitude of the signal, f c is the center frequency of the signal, n is the number of signal peaks, and H is the Heaviside step function.

[0059] If there is an impair...

Embodiment 2

[0074] Using 24 piezoelectric sensors to form a sensing network, the arrangement is as follows figure 1 As shown in (a), 24 sensors are evenly arranged on a circle with the center point of the tested plate structure as the center and a radius of 20 mm. A rectangular groove with a length of 50mm and a width of 0.2mm is processed on the metal plate structure to be tested to simulate cracks. The position is as follows: Figure 7 shown. Each sensor is used as the excitation, and the rest of the sensors are used as the receiver, and the non-destructive signal and the signal with cracks are collected sequentially, and a total of 552 sets of data are collected.

[0075] The damage factor DI was calculated from the reference (non-destructive) signal and the monitoring (cracked) signal in each set of data. The maximum value of DImax among the 552 DI values ​​is 1.3, and the corresponding path is sensor 7-9, so the direction of the crack is perpendicular to the sensing path 7-19, and ...

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Abstract

The invention relates to the equipment structure health monitoring field and discloses a metal material crack quantitative monitoring method based on a ultrasonic guided wave. The method comprises thefollowing steps of using a sensor network with a specific shape to carry out an excitation test on a metal material so as to obtain monitoring signals under different conditions; obtaining a damage index value through a damaged monitoring signal and a reference signal without damage; constructing a crack quantitative evaluation model of the metal material through a damage path probability imagingmethod; from monitoring imaging of a damage area of the crack quantitative evaluation model of the metal material, acquiring a slope of a straight line where a crack is located; setting a specific threshold, averaging coordinate values of discrete points which are greater than the specific threshold, and obtaining the coordinate values of the points through which the crack passes; acquiring an equation of the straight line where the crack is located through the slope of the straight line and the coordinate values of the points through which the crack passes; and through an intersection pointof the straight line and a damaged boundary line in a damaged imaging graph, acquiring end points of the crack. The method has advantages of being sensitive to small defects, having a large monitoringrange and the like.

Description

technical field [0001] The invention relates to the field of equipment structure health monitoring, in particular to a method for quantitatively monitoring metal material cracks based on ultrasonic guided waves. Background technique [0002] Metal materials are widely used in major equipment such as reusable aircraft and large lifting machinery. Metal structures are prone to cracks due to long-term repeated effects of stress or strain during service, which can lead to equipment damage and major safety accidents such as casualties in severe cases. [0003] At present, conventional non-destructive testing methods in engineering, such as: penetration testing, magnetic particle testing, radiographic testing, ultrasonic testing, eddy current testing, acoustic emission testing, etc., can be used to detect and locate fatigue cracks in metal structures, but these testing methods also have Its unique fields of application and limitations. For example, magnetic particle testing is l...

Claims

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Application Information

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IPC IPC(8): G01N29/06G01N29/04
Inventor 丁克勤赵娜胡亚男
Owner 招商中特智检(北京)技术有限公司
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