Crack detection with Lamb wave wavenumber analysis

The signals acquired by measurements of elastic wave propagation have been used for damage detection since the 1970s. The measurements have been carried out mostly by using piezoelectric transducers of various types. Many different sensor configurations and data processing have been proposed to detect and localise structural defects, both for real‐time and off‐line testing. Nevertheless, in the last decade, significant progress in the measurement techniques such as scanning laser Doppler vibrometry and shearographic interferometry has been made. These techniques enable measurement of a full wavefield of elastic waves. This opens up new possibilities and solutions for the problems of the damage detection in structures. Many researchers successfully applied this type of measurements for the damage detection and localisation in thin‐walled structures. Moreover, advanced signal processing techniques, such as wavenumber filtering, give the possibility of damage size estimation, by filling the gap between damage detection and damage prognosis. The aim of this paper is to give a comprehensive review of methods used for the full wavefield measurement. It also describes and compares selected signal processing algorithms developed for damage detection and visualisation based on these measuring techniques. Criticism aspects, as well as advantages of each algorithm, are denoted based on the authors' expertise in the field.

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“…Local wavenumber analysis proposed in is based on 3D FT. In this procedure, spatial windowing of full wavefield data is applied.…”

Section: Full Wavefield Signal Processing For Damage Detectionmentioning

confidence: 99%

50th Anniversary Article: Comparison Studies of Full Wavefield Signal Processing for Crack Detection

Ostachowicz

Radzieński

Kudela

2014

Strain

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“…However, this approach does not retain the spatial information. Through a spatial windowing technique, spatial information can be retained and the relationship between location and frequency/wavenumber can be revealed [14][15][16].…”

Section: Space-frequency-wavenumber Representationmentioning

confidence: 99%

Study on guided wave propagation in a water loaded plate with wavenumber analysis techniques

Tian

2014

AIP Conference Proceedings

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Acoustical wave propagator technique for time-domain analysis of dynamic stress in a step plate Abstract. Guided waves have been increasingly used for long range ultrasonic nondestructive evaluation (NDE) and structural heath monitoring (SHM) in thin-wall structures. When the structure is in contact with liquid such as water, the wave propagation will be changed due to the boundary condition change. In this paper, we study the guided wave propagation in a water loaded plate with wavenumber analyses. Experimentally, a surface mounted PZT wafer is used to generate the waves and a non-contact laser Doppler vibrometer (SLDV) is used to measure the time-space wavefield which contains a wealth of information regarding the propagating waves. Characteristic features of the propagating guided waves in the water loaded plate are acquired with three different wavenumber analysis techniques: (i) frequencywavenumber analysis, (ii) space-frequency-wavenumber analysis, and (iii) time-space-frequency-wavenumber analysis. Using the wavenumber representations, various wave modes such as A0, S0 as well as the quasi-Scholte modes specific in water-solid interface are readily recognized. Mode conversions and boundary reflections are also identified at the interface where air medium changes to water. The results have shown the effectiveness of wavenumber analysis techniques in the study of wave propagation from the perspective of wavenumber domain. PLATE WAVE PROPAGATION STUDYFor a plate with traction free boundary conditions, Lamb waves can propagate along the plate. However, when the plate is submerged into liquid, one side or both, the plate wave propagation will be changed. This section presents the theoretical studies on wave propagations in a free plate and a water-loaded plate.

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“…Anomalies of GW propagating in honeycomb core sandwich plates with debonding were studied numerically, as well as by using laser vibrometer data by Zhao et al [13]. Various techniques of damage localization were developed in recent years using various phenomena like wave reflection detection [14], local standing wave [15], a local change in wavelength [16], energy distribution variations [17,18], local magnitude decrease [19], etc. GW measurement techniques, along with full wavefield processing techniques for damage detection, were summarized in the paper [20].…”

Section: Introductionmentioning

confidence: 99%

Damage Identification in Various Types of Composite Plates Using Guided Waves Excited by a Piezoelectric Transducer and Measured by a Laser Vibrometer

Radzieński

Kudela

Marzani

et al. 2019

Sensors

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Composite materials are widely used in the industry, and the interest of this material is growing rapidly, due to its light weight, strength and various other desired mechanical properties. However, composite materials are prone to production defects and other defects originated during exploitation, which may jeopardize the safety of such a structure. Thus, non-destructive evaluation methods that are material-independent and suitable for a wide range of defects identification are needed. In this paper, a technique for damage characterization in composite plates is proposed. In the presented non-destructive testing method, guided waves are excited by a piezoelectric transducer, attached to tested specimens, and measured by a scanning laser Doppler vibrometer in a dense grid of points. By means of signal processing, irregularities in wavefield images caused by any material defects are extracted and used for damage characterization. The effectiveness of the proposed technique is validated on four different composite panels: Carbon fiber-reinforced polymer, glass fiber-reinforced polymer, composite reinforced by randomly-oriented short glass fibers and aluminum-honeycomb core sandwich composite. Obtained results confirm its versatility and efficacy in damage characterization in various types of composite plates.

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Crack detection with Lamb wave wavenumber analysis

Cited by 15 publications

References 30 publications

50th Anniversary Article: Comparison Studies of Full Wavefield Signal Processing for Crack Detection

50th Anniversary Article: Comparison Studies of Full Wavefield Signal Processing for Crack Detection

Study on guided wave propagation in a water loaded plate with wavenumber analysis techniques

Damage Identification in Various Types of Composite Plates Using Guided Waves Excited by a Piezoelectric Transducer and Measured by a Laser Vibrometer

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