Adhesive debonding inspection with a small EMAT in resonant mode

Liu, Tianhao; Pei, Cuixiang; Cheng, Xu; Zhou, Haiqiang; Xiao, Pan; Chen, Zhenmao

doi:10.1016/j.ndteint.2018.05.005

Cited by 31 publications

(11 citation statements)

References 13 publications

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“…A number of non-destructive examination (NDE) techniques have been attempted to reveal defects in adhesive joints. Ultrasonic techniques based on a range of different working principles including the conventional pulse-echo [5][6][7] or through transmission [6] methods, and the more advanced guided wave technique [8,9], acoustic microscopy [10,11], and the electromagnetic acoustic transducer [12] have been proposed. Non-ultrasound Polymers 2021, 13, 2954 2 of 16 techniques, such as electromechanical impedance spectroscopy using external [13] or embedded piezoelectric sensors [14,15], thermography [7,16,17] and shearography [6,18,19] have also been attempted.…”

Section: Introductionmentioning

confidence: 99%

Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors

Shin

Lin

2021

Polymers

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Although adhesive joining has many advantages over traditional joining techniques, their integrity is more difficult to examine and monitor. Serious structural failures might follow if adhesive joint degradation goes undetected. Available non-destructive examination (NDE) methods to detect defects are helpful in discovering defective joints during fabrication. For long-term monitoring of joint integrity, many of these NDE techniques are prohibitively expensive and time-consuming to carry out. Recently, fiber Bragg grating (FBG) sensors have been shown to be able to reflect strain in adhesive joints and offer an economical alternative for on-line monitoring. Most of the available works relied on the peak shifting phenomenon for sensing and studies on the use of full spectral responses for joint integrity monitoring are still lacking. Damage and disbonding inside an adhesive joint will give rise to non-uniform strain field that may chirp the FBG spectrum. It is reasoned that the full spectral responses may reveal the damage status inside the adhesive joints. In this work, FBGs are embedded in composite-to-composite single lap joints. Tensile and fatigue loading to joint failure have been applied, and the peak splitting and broadening of the full spectral responses from the embedded FBGs are shown to reflect the onset and development of damages. A parameter to quantify the change in the spectral responses has been proposed and independent assessment of the damage monitoring capability has been verified with post-damage fatigue tests.

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Section: Introductionmentioning

confidence: 99%

Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors

Shin

Lin

2021

Polymers

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“…The calculated Lorentz force is then applied to the elasto-dynamic equation as a body load, ü = ∂ 2 u/∂t 2 , T 0 is the first Piola-Kirchhoff stress tensor, ρ 0 is the mass density. Ultrasonic signals are received in the pick-up coils according to the law of electromagnetic induction.The induced voltage V at the EMAT receiver is [22]:…”

Section: Design and Principle Of The Modified Ematmentioning

confidence: 99%

“…Kang made use of the optimized characteristic of stronger horizontal magnetic field to optimized the coil arrangement and achieve high-energy conversion efficiency [21]. Liu compared eight magnetic configurations and determined that the magnetic field can be more concentrated with the superposition of three different diameters magnets [22]. Wang investigated the optimal size of coils for improving the transduction efficiency of the EMAT using orthogonal design method [23].…”

Section: Introductionmentioning

confidence: 99%

“…According to these works, the transduction efficiency of EMAT can be influenced by many parameters regards to the coil and the permanent magnets. Among them, the square of the strength of the magnetic field plays the vital role [22].The static magnetic field is an essential factor of the transduction and can be applied via a permanent magnet. However, there are no relevant studies concerning optimization analyses of both the exciting and reception processes of EMAT, as well as the reasonable utilization of the magnetic circuit characteristics of EMAT transmitters and receivers (most of the optimized configurations of EMAT transmitters and receivers are the same, and the magnetic circuits are independent).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Lamb-EMAT Signal Using a Modified One-Side Pitch-Catch Design

Cai¹,

Yan²,

Tian³

2019

IEEE Access

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This study presents a modified one-side pitch-catch electromagnetic acoustic transducer (EMAT), the optimized design improves the horizontal static magnetic field excitation and helps to enhance the generation and reception of the Lamb wave. A coupling model is applied to characterise and analyse the new design in detail. The model indicates that the optimized magnetic field with an increased peak flux density compared to the traditional magnetic configuration of EMAT. As a result, the transduction efficiency of the one-side pitch-catch design is dramatically improved ingeneration and reception process. Experiments verify that a measurement system using the modified one-side pitch-catch design is improved by a factor of 3.3, when compared to conventional one-side pitch-catch design.INDEX TERMS EMAT, Lamb waves, magnetic circuit optimization, one-side pitch-catch.

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“…In the last few decades, many researchers have put effort into addressing this demand (see, e.g., [7,9,15,19,20]). From the available literature, it can be seen that the methods based on ultrasound have emerged as the most promising ones.…”

Section: Introductionmentioning

confidence: 99%

Toward an ultrasonic inspecting method to detect and classify adhesive bonding defects in real time: a numeric study

Ribeiro

Leiderman

Clua

2020

J Braz. Soc. Mech. Sci. Eng.

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Adhesive bonding is an efficient method to join different components in structural design. However, a reliable nondestructive inspecting method to attest the integrity of adhesive bonds is still an open task. In the last few decades, many researchers have put effort into addressing this demand, and the methods based on ultrasound have emerged as the most promising ones. It is consensual that the capability of modeling both mathematically and computationally the interaction between ultrasonic waves and adhesive bonds will play a crucial role in the development of any ultrasonic inspecting method. In that sense, in a previous work, an algorithm to compute the scattering of ultrasonic waves by defective adhesive bonds was developed and implemented. In the present work, we revisit the algorithm and develop a novel GPU parallel implementation, aiming to reduce considerably the execution time. As shown, our new implementation has reduced the execution time by a factor of around 25, opening the possibility for solving the correlated inverse problem in real time. To the best of our knowledge, this is the first time in the literature that GPU is employed to solve this particular ultrasonic scattering problem.

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Adhesive debonding inspection with a small EMAT in resonant mode

Cited by 31 publications

References 13 publications

Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors

Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors

Enhancement of Lamb-EMAT Signal Using a Modified One-Side Pitch-Catch Design

Toward an ultrasonic inspecting method to detect and classify adhesive bonding defects in real time: a numeric study

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