Surface acoustic wave modulation on a partially closed fatigue crack

Kim, Jin‐Yeon; Yakovlev, V. A.; Rokhlin, S. I.

doi:10.1121/1.1695012

Cited by 49 publications

(29 citation statements)

References 27 publications

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“…Such imperfect interfaces are present in various forms in nature as well as in technological products. Acoustic or ultrasonic characterization of imperfect interfaces, e.g., fractures in rocks [1], machine elements with contacting parts [2,3], kissing bonds and closed cracks in structural members [4][5][6], has been studied extensively in geophysical exploration and ultrasonic nondestructive testing. When elastic waves impinge on these imperfect interfaces, they exhibit partial reflection and transmission in a frequency-dependent manner.…”

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation in an infinite layered structure with nonlinear spring-type interfaces

Biwa

Ishii

2016

Wave Motion

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The second-harmonic generation characteristics in the elastic wave propagation across an infinite layered structure consisting of identical linear elastic layers and nonlinear spring-type interlayer interfaces are analyzed theoretically. The interlayer interfaces are assumed to have identical linear interfacial stiffness but can have different quadratic nonlinearity parameters. Using a perturbation approach and the transfer-matrix method, an explicit analytical expression is derived for the second-harmonic amplitude when the layered structure is impinged by a monochromatic fundamental wave. The analysis shows that the second-harmonic generation behavior depends significantly on the fundamental frequency reflecting the band structure of the layered structure. Two special cases are discussed in order to demonstrate such dependence, i.e., the second-harmonic generation by a single nonlinear interface as well as by multiple consecutive nonlinear interfaces. In particular, when the second-harmonic generation occurs at multiple consecutive nonlinear interfaces, the cumulative growth of the second-harmonic amplitude with distance is only expected in certain frequency ranges where the fundamental as well as the double frequencies belong to the pass bands of the layered structure. Furthermore, a remarkable increase of the second-harmonic amplitude is found near the terminating edge of pass bands. Approximate expressions for the low-frequency range are also obtained, which show the cumulative growth of the second-harmonic amplitude with quadratic frequency dependence.

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Section: Introductionmentioning

confidence: 99%

Second-harmonic generation in an infinite layered structure with nonlinear spring-type interfaces

Biwa

Ishii

2016

Wave Motion

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“…If the two excitation sources are independent, then the modulation is due only to the nonlinear behavior of the sample. NWMS has successfully been applied to detect closed cracks in steel [18,19], aluminum [20,21] or delaminations in composite material [22,23]. However, classical material nonlinearity can also lead to wave modulation, which makes distinguishing closed cracks difficult.…”

Section: Introductionmentioning

confidence: 99%

2D finite element modeling of the non-collinear mixing method for detection and characterization of closed cracks

Blanloeuil

Méziane

Bacon

2015

NDT & E International

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Cite this article as: P. Blanloeuil, A. Meziane, C. Bacon, 2D Finite Element modeling of the non-collinear mixing method for detection and characterization of closed cracks, NDT&E International, http://dx.doi.org/10.1016/j. ndteint. 2015.08.001 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe non-collinear mixing technique is applied for detection and characterization of closed cracks.The method is based on the nonlinear interaction of two shear waves generated with an oblique incidence, which leads to the scattering of a longitudinal wave. A Finite Element model is used to demonstrate its application to a closed crack. Contact acoustic nonlinearity is modeled using unilateral contact law with Coulomb's friction. The method is shown to be effective and promising when applied to a closed crack. Scattering of the longitudinal wave also enables us to image the crack, giving its position and size.

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“…In other words, the modulation technique was shown to be able to selectively detect nonlinear material defects. adapted this method to increase the sensitivity of ultrasonic inspections to poor adhesive bonds between aluminum plates, while Kim et al [2004b] (see also references therein) used it to characterize small surface-breaking cracks initiated at surface pits by fatigue. Finally, Kazakov et al [2002] used the same idea to image the nonlinear properties of a surfacebreaking crack.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Finally, Kazakov et al [2002] used the same idea to image the nonlinear properties of a surfacebreaking crack. , Kim et al [2004a;2004b] and Kazakov et al [2002] used a low-frequency source of mechanical vibrations to vary the instantaneous properties of the defect of interest.…”

Section: Numerical Resultsmentioning

confidence: 99%

So… is this a surface-breaking crack?

Poznić

Pecorari

2006

JOMMS

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An inspection technique used to assess the structural integrity of critical components in a nuclear power plant must be able to discern surface-breaking cracks from subsurface cracks. This work proposes an ultrasonic method to provide that information and presents a theoretical investigation into it. The main assumption of the model is that water carried by pressurized pipes infiltrates and fills a surface-breaking crack, while a subsurface crack is dry. The model simulates an inspection in which the modulation technique is employed and the surface hosting the crack is not accessible. A ratio, R, constructed with signals recorded in backscattering configuration during a modulation cycle, is examined and shown to provide a clear criterion allowing subsurface cracks to be distinguished from surface-breaking cracks when a shear vertical wave at 45 degree incidence is employed as a probe.

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Surface acoustic wave modulation on a partially closed fatigue crack

Cited by 49 publications

References 27 publications

Second-harmonic generation in an infinite layered structure with nonlinear spring-type interfaces

Second-harmonic generation in an infinite layered structure with nonlinear spring-type interfaces

2D finite element modeling of the non-collinear mixing method for detection and characterization of closed cracks

So… is this a surface-breaking crack?

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