Nonlinear Lamb wave-mixing technique for micro-crack detection in plates

Jiao, Jingpin; Meng, Xiangchao; He, Cunfu; Wu, Bin

doi:10.1016/j.ndteint.2016.10.006

Cited by 114 publications

(35 citation statements)

References 20 publications

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“…(4) and (5) These terms correspond to possible second order harmonic waves at 2k 1 ) and (2ω 2 , 2k 2 ) which are the sum and difference combinational harmonics respectively [18] along with harmonics of individual fundamental wave. Nonlinear acoustic parameter can be expressed as 4A ω1þω2= ABk 1 k 2 x [15]. In this work, the amplitude of the sum frequency component has been evaluated for 04 various positions for varying propagation distances to assess the localized deformation and is denoted as A ω1þω2 .…”

Section: Lamb Wave Propagation and Mixingmentioning

confidence: 99%

“…1 shows the phase velocity and group velocity dispersion curves of Lamb waves for 2 mm thick modified 9Cr-1 Mo steel plate. Due to multimodal and dispersive nature of Lamb waves, fundamental mode is desirable for any NDE application [15]. Accordingly, in this work, S0 mode was chosen due to its almost non-dispersive nature and uniform mode shape through-out the thickness in lower frequency regime.…”

Section: Selection Of Fundamental Frequenciesmentioning

confidence: 99%

“…Some aspects of guided wave mixing have also been discussed by C J Lissenden et al [14]. Very recently J Jingpin et al used the nonlinear Lamb wave mixing technique for micro-crack detection in plates [15]. But no work has been performed to use the Lamb wave mixing technique to assess the localized deformation in materials.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Lamb wave mixing for assessing localized deformation during creep

Metya

Tarafder

Balasubramaniam

2018

NDT & E International

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A B S T R A C TNonlinear ultrasonic is known to be a promising technique to characterize the microstructural degradation in engineering materials. This work demonstrates the use of nonlinear Lamb wave mixing technique to assess the localized deformation in modified 9Cr -1Mo steel during creep. Two Lamb wave modes of different frequencies (ω 1 & ω 2 ) are allowed to mix within the material under certain resonant condition to generate third type of harmonic waves of frequencies (ω 1 AEω 2 ). This new generated wave carries the information of material nonlinearity from the mixing site and independent of the other extraneous nonlinear factors. Amplitude of the generated third wave depends on the third order elastic constants of the material. This study reveals that nonlinear Lamb wave mixing technique could be used to assess the localized deformation much prior to its failure.

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Section: Lamb Wave Propagation and Mixingmentioning

confidence: 99%

Section: Selection Of Fundamental Frequenciesmentioning

confidence: 99%

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Nonlinear Lamb wave mixing for assessing localized deformation during creep

Metya

Tarafder

Balasubramaniam

2018

NDT & E International

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“…Substituting Equations (7), (8) or (12) into Equation (3) separately, the transfer matrix of the elastic wave with different crack mode can then be deduced. Further, the eigenvalues of the transfer matrix can be studied, and then the propagation characteristics of the elastic waves can be obtained.…”

Section: Local Stiffness Coefficientmentioning

confidence: 99%

“…Wave-based damage detection techniques are employed prevalently in the health-monitoring of structural components. Wave method has been used for many applications in 1-D structure [11], in a plate [12], in metamaterial rods [13], in a square pile [14] and in a non-uniform cross-section piles [15] etc. In particular, techniques exploiting wave-damage interactions have received an increasing attention in the recent past, because of the advantages that they offer over the conventional techniques in terms of robustness and higher sensitivity [16,17].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Crack Modes on the Elastic Wave Propagation Characteristics in a Non-uniform Rotating Shaft

Wei¹,

Shi²,

Liu³

et al. 2018

Preprint

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The vibration propagates in a media such as a shaft in the form of elastic waves. The propagation characteristics of the waves are affected by the geometry of the media, the material properties as well as the cracks. The study to elastic waves propagating in a shaft with transverse cracks can help to detect them. The transverse crack possesses different crack modes due to different external loads. The influence of the crack mode, the location and the depth to the propagation characteristics is investigated in this paper. Firstly, the local flexibility coefficients with three different modes are deduced. And then, the transfer matrix of the elastic wave can be obtained. Finally, the influence of the crack mode, the location and the depth of the transverse crack as well as the rotating speed to the propagation characteristics is then studied, both in a numerical and an experimental way. It’s found that mode III is the most suitable mode in this paper, the location of the crack will make the stopbands fluctuating, the depth mainly affects the bandwidth of the stopbands, and the increase of the rotating speed will shift up the stopbands without changing their bandwidths.

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Impact damage assessment in patch‐repaired carbon fiber‐reinforced polymer laminates using the nonlinear Lamb wave‐mixing technique

et al. 2022

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This study investigates assessment of the barely visible impact damage (BVID) caused by low-velocity impact (LVI) in single-sided patch-repaired orthotropic carbon fiber-reinforced polymer (CFRP) laminates using experimental and numerical nonlinear Lamb wave-mixing techniques. An accurate finite element method (FEM) approach consisting of three analysis steps of LVI, vibration damping, and nonlinear ultrasonic mixing detection is proposed to predict the relationship between LVI damage and nonlinear Lamb wave-mixing propagation. The LVI step in the FEM simulation is verified by drop-weight impact tests, and the nonlinear Lamb wave-mixing detection step in FEM is verified by comparing with the RITEC RAM-5000 SNAP nonlinear mixing detection system.The BVID of patch-repaired specimens is assessed with mixing relative acoustic nonlinearity parameters (MRANPs). CFRP laminates repaired with various external patch parameters of different sizes, numbers of layers and stacking sequences are evaluated by the FEM approach. Finally, an optimized patch design in which the MRANPs are the smallest is determined. Therefore, the CFRP laminate containing a hole is recommended to be repaired with a circular three-layer patch with a radius of 2.5 r and a stacking sequence of [90/90/90].

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Nonlinear Lamb wave-mixing technique for micro-crack detection in plates

Cited by 114 publications

References 20 publications

Nonlinear Lamb wave mixing for assessing localized deformation during creep

Nonlinear Lamb wave mixing for assessing localized deformation during creep

The Influence of Crack Modes on the Elastic Wave Propagation Characteristics in a Non-uniform Rotating Shaft

Impact damage assessment in patch‐repaired carbon fiber‐reinforced polymer laminates using the nonlinear Lamb wave‐mixing technique

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