Reflection and transmission coefficients of the SH0 mode in the adhesive structures with imperfect interface

Ding, Juncai; Wu, Bin; He, Cunfu

doi:10.1016/j.ultras.2016.05.010

Cited by 15 publications

(3 citation statements)

References 31 publications

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“…Ishii analyzed theoretically the two-dimensional elastic wave propagation in an infinite layered structure with non-linear interlayer interfaces for investigating the second-harmonic generation due to interfacial nonlinearity [30]. Many other works have been carried out for ultrasonic characterization of the interfacial weakness in multilayered structure [31,32]. However, due to the complex propagation characteristics of ultrasonic waves in layered structures, few scholars have systematically analyzed the quality of two or more bonding interfaces in the past.…”

Section: Introductionmentioning

confidence: 99%

Evaluating interfacial bonding quality of multilayered structure based on ultrasonic testing technology

Wang

et al. 2023

Meas. Sci. Technol.

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An ultrasonic evaluation method of interfacial bonding quality from layered structures is proposed for enhancing the testing accuracy. The ultrasonic reflection and transmission characteristic is theoretically analyzed, which focus on the different quality of the single and double bonding interface with spring-type. The reflection coefficient and transmission coefficient mathematic models, which include multiple parameters, are derived from the transfer matrix. Taking the first, second, and the double bonding interface as the research objects, respectively, two types of resonant frequencies have been presented by numerical solving the model, namely, the first type resonance frequency (RFI) and the second type resonance frequency (RFII). The results show that the interval of the RFⅠ is related to medium thickness of the maximum acoustic impedance. Similarly, the interval of the RFⅡ depends on other layers’ thickness. In addition, the transmission coefficient shows a change in different trends with the bonding interface gradually tending to rigid. When the adhesive layer thickness is sufficiently small compared with the wavelength, the reflection coefficient shows many local minima points at a certain frequencies range, the frequency of local minimum point increases with the increase of the stiffness coefficient. The experimental results are in good agreement with the numerical solution results and finite element analysis (FEA) results.

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Section: Introductionmentioning

confidence: 99%

Evaluating interfacial bonding quality of multilayered structure based on ultrasonic testing technology

Wang

et al. 2023

Meas. Sci. Technol.

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“…Based on the acoustic wave equation and boundary conditions, Liu [18] used the potential function to analyze the acoustic propagation mechanism of the layered composites with arbitrary incident angles, and illustrated the variation of the amplitude and phase of the transmission coefficient with the frequency. Ding [19] derived the expression of reflection and transmission coefficient of the SH wave in multi-layer plate-like bonded structures in the light of the wave propagation equation and shear stiffness coefficient, which provided a theoretical basis for the SH wave to evaluate multi-layer plate-like bonded structure. Liu [20] proposed a way to measure the plane bonded structure using wideband focused ultrasound in vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Measurement Interface Stiffness of Bonded Structures Using Air-Coupled Ultrasonic Transmission Technology

Wang

Huang

et al. 2021

IEEE Access

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An air-coupled ultrasonic technology is introduced as a new tool for evaluating the interfacial quality of bonded structures in this paper. Thus, a mathematical model including the stiffness coefficient, the transmission coefficient and the frequency, etc. is proposed. Two type resonant frequencies, namely, the first type resonance frequency (RFⅠ) and the second type resonance frequency (RFⅡ), have been obtained by numerical solving the model. The interval of the RFⅠ is related to the thickness of a polymethyl methacrylate (PMMA) layer. Similarly, the interval of the RFⅡ depends on the thickness of an aluminum (Al) layer. In addition, the stiffness coefficient is associated with the RFⅠ but not with the RFⅡ. The RFⅠ drifts to high-frequency with different speed from the low stiffness coefficient to the high stiffness coefficient, which no longer changes when the stiffness coefficient tends to infinity. The before-RFⅠ moves faster than after-RFⅠ in a "Period" of the RFⅡ. With the increase of the stiffness coefficient, the transmission coefficient gradually increases, and then increases slowly when the stiffness coefficient approaches to a critical value. Several double-layer bonded samples with the different thicknesses were made to carry out air-coupled ultrasonic experiment. The change of stiffness coefficients was simulated by different bonding time. Transmission signals from ultrasonic testing were recorded for further processing. Comparing the experimental and simulation results, the stiffness coefficient of the bonded structure can be judged by the RFⅠ and the transmission coefficient.

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“…But SH0 mode GW is free of dispersion, and the group velocity is a constant for the given materials and parameters of the structure, instead of varying with the working frequency [10]. This feature of SH0 mode GW lays the theoretical foundation for accurate detection of defects by SH0 mode wave [11].…”

Section: Introductionmentioning

confidence: 99%

Direction-Controllable Electromagnetic Acoustic Transducer for Sh Waves in Steel Plate Based on Magnetostriction

Zhang¹,

Huang²,

Wang³

et al. 2016

PIER M

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Abstract-Shear-horizontal (SH) wave is commonly used in monitoring and detecting steel plate structures. Electromagnetic acoustic transducer (EMAT) based on magnetostriction owns higher transducing efficiency and can be applied in non-contact situations. In some practical applications, it is necessary to inspect the structure on a specific direction and the inspecting direction is required to be variable and accurately controllable. This work proposes a novel direction-controllable EMAT for SH0 mode waves based on magnetostriction. Theoretical foundation and analysis on the magnetostriction model of the new EMAT and working parameters determination are conducted. The detailed structure and design of the new EMAT are presented, with the pre-magnetized open annular nickel strap bonded to the steel plate providing the circumferential static bias magnetic field, and the cooperation of embedded conductors in the rotating slider and open metal rings providing the dynamic magnetic field. Besides, the experimental system for the performance verification of the new EMAT is setup. Three indexes, the dead zone angle, focus angle and consistency error are defined to evaluate the performance quantitatively. The dead zone angle of the new EMAT is 28.74 • ; the focus angle is 10.7 • ; the consistency error is only 1.4%. Experimental results show that the proposed direction-controllable EMAT is highly directional. The stimulating direction can be accurately controlled, and the circumferential consistency is fairly high. The direction-controllable EMAT can hopefully provide a practical solution for directional monitoring and inspecting for steel plate structures.

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Reflection and transmission coefficients of the SH0 mode in the adhesive structures with imperfect interface

Cited by 15 publications

References 31 publications

Evaluating interfacial bonding quality of multilayered structure based on ultrasonic testing technology

Evaluating interfacial bonding quality of multilayered structure based on ultrasonic testing technology

Measurement Interface Stiffness of Bonded Structures Using Air-Coupled Ultrasonic Transmission Technology

Direction-Controllable Electromagnetic Acoustic Transducer for Sh Waves in Steel Plate Based on Magnetostriction

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