A General Purpose Computer Model for Calculating Elastic Waveguide Properties, with Application to Non-Destructive Testing

Lowe, M. J. S.; Cawley, P.; Pavlakovic, Brian

doi:10.1007/1-4020-2387-1_14

Cited by 13 publications

(19 citation statements)

References 36 publications

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“…2and 3. The works of Lowe et al [159] and Nayfeh [183] investigate wave propagation in plates with boundary conditions corresponding to plates immersed in fluids (water or air). In [183] the boundary conditions that model the common interface of the plate and an elastic solid are investigated.…”

Section: Analytical Methods In the Frequency Domain 311 Outline Of mentioning

confidence: 99%

Simulation Methods for Guided Wave-Based Structural Health Monitoring: A Review

Willberg

Duczek

Vivar-Perez

et al. 2015

Applied Mechanics Reviews

124

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This paper reviews the state-of-the-art in numerical wave propagation analysis. The main focus in that regard is on guided wave-based structural health monitoring (SHM) applications. A brief introduction to SHM and SHM-related problems is given, and various numerical methods are then discussed and assessed with respect to their capability of simulating guided wave propagation phenomena. A detailed evaluation of the following methods is compiled: (i) analytical methods, (ii) semi-analytical methods, (iii) the local interaction simulation approach (LISA), (iv) finite element methods (FEMs), and (v) miscellaneous methods such as mass–spring lattice models (MSLMs), boundary element methods (BEMs), and fictitious domain methods. In the framework of the FEM, both time and frequency domain approaches are covered, and the advantages of using high order shape functions are also examined.

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Section: Analytical Methods In the Frequency Domain 311 Outline Of mentioning

confidence: 99%

Simulation Methods for Guided Wave-Based Structural Health Monitoring: A Review

Willberg

Duczek

Vivar-Perez

et al. 2015

Applied Mechanics Reviews

124

View full text Add to dashboard Cite

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“…As a result, it will be more viable and reliable to measure the very small changes in ultrasonic wave velocities in the frequency domain caused by the stress field. Since its discovery in the 1980s, the LLW technology has been applied for many NDE applications, such as the measurement of material properties [6], the cohesive properties of bonds [5], and the properties of composite materials [7]. However, the key parameters in the LLW dispersion equation, such as the plate thickness, density, and longitudinal and transverse ultrasonic wave velocities, are coupled in the symmetric and antisymmetric Lamb wave modes, and cannot be decoupled easily in general [8].…”

Section: Introductionmentioning

confidence: 98%

Stress Evaluation Using Ultrasonic Interference Spectrum of Leaky Lamb Waves

Zhu

Post

Xu³

2010

Exp Mech

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This paper presents a nondestructive stress evaluation technique using the ultrasonic interference spectrum of leaky Lamb waves. By using a specific pitch-catch ultrasonic setup, the symmetric and antisymmetric modes of Lamb waves in a finite plate are decoupled, leading to simple relationships between the modal frequency spacing of two adjacent modes in the interference spectrum and the acoustic wave velocities that are functions of stress. As a result, the stress in the plate can be determined by measuring the modal frequency spacing instead of the relative flight times to calculate the acoustic wave velocity. Extensive experiments were carried out to verify the viability and robustness of the new technique using a simple testing system. It has been demonstrated that the new technique is about 25 times more accurate than existing flight-time approaches using the same testing system. The experimental results agree well with the results obtained by other ultrasonic methods using expensive equipment.

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“…Long-range inspection of pipelines has been practiced for two decades [22][23][24]. GW dispersion analysis software packages became available for GW velocities and attenuation [25][26][27]. GW analysis methods for anisotropic materials and structures were developed [4,[28][29][30][31][32][33][34][35][36], and GW in non-linear solids started to provide a new NDE approach, especially for detecting fatigue damage [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Lamb-Wave Attenuation Coefficients

Ono

2022

Applied Sciences

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This work determined the attenuation coefficients of Lamb waves of ten engineering materials and compared the results with calculated Lamb-wave attenuation coefficients, α–S and α–A. The Disperse program and a parametric method based on Disperse results were used for calculations. Bulk-wave attenuation coefficients, αL and αT, were required as input parameters to the Disperse calculations. The calculated α–S and α–A values were found to be dominated by the αT contribution. Often α–Ao coincided with αT. The values of αL and αT were previously obtained or newly measured. Attenuation measurement relied on Lamb-wave generation by pulsed excitation of ultrasonic transducers and on surface-displacement detection with point contact receivers. The frequency used ranged from 10 kHz to 1 MHz. A total of 14 sheet and plate samples were evaluated. Sample materials ranged from steel, Al, and silicate glass with low attenuation to polymers and a fiber composite with much higher attenuation. Experimentally obtained Lamb-wave attenuation coefficients, α–S and α–A, for symmetric and asymmetric modes, were mostly for the zeroth mode. Plots of α–So and α–Ao values against frequency were found to coincide reasonably well to theoretically calculated curves. This study confirmed that the Disperse program predicts Lamb-wave attenuation coefficients for elastically isotropic materials within the limitation of the contact ultrasonic techniques used. Further refinements in experimental methods are needed, as large deviations often occurred, especially at low and high frequencies. Methods of refinement are suggested. Displacement measurements were quantified using Rayleigh wave calibration. For signals below 300 kHz, 1-mV receiver output corresponded to 1-pm displacement. Peak displacements after 200-mm propagation were found to range from 10 pm to 1.5 nm. With the use of signal averaging, the point-contact sensor was capable of detecting 1-pm displacement with 40 dB signal-to-noise ratio and had equivalent noise of 4.3 fm/√Hz. Approximate expressions for α–So and α–Ao were obtained, and an empirical correlation was found between bulk-wave attenuation coefficients, i.e., αT = 2.79 αL, for over 150 materials.

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A General Purpose Computer Model for Calculating Elastic Waveguide Properties, with Application to Non-Destructive Testing

Cited by 13 publications

References 36 publications

Simulation Methods for Guided Wave-Based Structural Health Monitoring: A Review

Simulation Methods for Guided Wave-Based Structural Health Monitoring: A Review

Stress Evaluation Using Ultrasonic Interference Spectrum of Leaky Lamb Waves

Experimental Determination of Lamb-Wave Attenuation Coefficients

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