Ultrasonic inspection of adhesively bonded CFRP/aluminum joints using pulsed laser scanning

Toyama, Nobuyuki; Yamamoto, Tetsuya; Urabe, Kei; Tsuda, Hiroshi

doi:10.1080/09243046.2017.1416517

Cited by 26 publications

(9 citation statements)

References 20 publications

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“…To identify how the proposed non-contact method compares to the conventional methods [11][12][13][14], we analyzed the same specimen using a contact ultrasonic transducer instead of the LDV. Figure 7 depicts the visual results of the ultrasonic-wave propagation for the CFRP quasi-isotropic specimen using the conventional method.…”

Section: Discussionmentioning

confidence: 99%

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Non-Contact Ultrasonic Inspection of Impact Damage in Composite Laminates by Visualization of Lamb wave Propagation

Toyama

Kokuyama

et al. 2018

Applied Sciences

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This study demonstrates a rapid non-contact ultrasonic inspection technique by visualization of Lamb wave propagation for detecting impact damage in carbon fiber reinforced polymer (CFRP) laminates. We have developed an optimized laser ultrasonic imaging system, which consists of a rapid pulsed laser scanning unit for ultrasonic generation and a laser Doppler vibrometer (LDV) unit for ultrasonic reception. CFRP laminates were subjected to low-velocity impact to introduce barely visible impact damage. In order to improve the signal-to-noise ratio of the detected ultrasonic signal, retroreflective tape and a signal averaging process were used. We thus successfully visualized the propagation of the pulsed Lamb A0 mode in the CFRP laminates without contact. Interactions between the Lamb waves and impact damage were clearly observed and the damage was easily detected through the change in wave propagation. Furthermore, we demonstrated that the damage could be rapidly detected without signal averaging. This method has significant advantages in detecting damage compared to the conventional method using a contact resonant ultrasonic transducer due to the absence of the ringing phenomenon when using the LDV.

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Section: Discussionmentioning

confidence: 99%

“…Although this is not a "fully" non-contact technique, it operates excellently, enables quick inspection of objects of arbitrary shapes. We have applied it to the non-destructive inspection of various structural components and demonstrated its usefulness [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Ultrasonic Inspection of Impact Damage in Composite Laminates by Visualization of Lamb wave Propagation

Toyama

Kokuyama

et al. 2018

Applied Sciences

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“…Several works [28,29,32,[39][40][41][42][43][44][45][46][47][48] have focused on the adhesive bonded joints. The influence of the geometric configuration has been observed, such as the thickness of the adhesive layer and overlap length, along with processing factors on the behavior of joints, such as surface preparation and curing time and temperature.…”

Section: Environmental and Design Factors That Influence The Performance Of The Adhesive Bonded Jointsmentioning

confidence: 99%

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

Gualberto

Amorim

Costa

2021

J Braz. Soc. Mech. Sci. Eng.

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Fiber-reinforced polymers (FRPs) combine characteristics of polymers and fibers to obtain a material with high mechanical strength and stiffness together with low specific mass and good corrosion resistance. The use of FRPs is growing as an alternative to metals in the automotive, aerospace and civil construction industries. Since adhesive bonded joints are an excellent way of joining materials due to the better load distribution, the use of FRPs for this purpose has been the objective of many studies about durability and structural safety. In service, environmental factors, including temperature, humidity, UV exposure and salt spray, can degrade materials, leading to unexpected failures. Since joints in service are subject to these multiple and uncontrolled adverse conditions, FRP adhesive bonded joint degradation has been studied by experiments that simulate these adverse environmental conditions. The combined analysis of the effect of environmental factors on the joint and the materials of each component allows predicting the system performance. In addition, optimal design parameters, such as the thickness of the adhesive, overlap length, materials and manufacturing processes, may be different according to the target application of the joint. Therefore, the achievement of optimal design parameters depends on the understanding of joint behavior in service. Based on analysis of the contribution of researchers in the specialized literature on adhesive joints and FRPs, this article reviews the main findings on degradation of adhesive joints and their components. Research topics for optimization of adhesive joint systems are also discussed.

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“…Aiming at further damage visibility and operability, a visualization method of ultrasonic wave propagation [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] has been developed. In this method, ultrasonic waves are generated by illuminating a specimen surface with a pulsed laser and are received by a fixed transducer [14].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the reciprocity of wave propagation [15], the amplitude of each waveform at a particular time plotted in a contour map yields a moving diagram of the wave propagation from the receiver. The feasibility of this method was demonstrated by applying it to a crack and an artificial hollow in metallic materials [15], delamination in carbon fiber reinforced plastic (CFRP) laminates [16][17][18][19][20], a crack in welded steel plates [21], and disbonds in adhesively bonded CFRP/aluminum joints [22]. Frequency and/or wavenumber domain analysis using the Fourier-or wavelet-transform was introduced into ultrasonic propagation imaging to easily interpret the visualized results of wave propagation by isolating a specific frequency mode [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization-Based Damage Identification Using Visualized Ultrasonic Wave Propagation

et al. 2019

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This study proposes a new damage identification method based on topology optimization, combined with visualized ultrasonic wave propagation. Although a moving diagram of traveling waves aids in damage detection, it is difficult to acquire quantitative information about the damage, for which topology optimization is suitable. In this approach, a damage parameter, varying Young’s modulus, represents the state of the damage in a finite element model. The feature of ultrasonic wave propagation (e.g., the maximum amplitude map in this study) is inversely reproduced in the model by optimizing the distribution of the damage parameters. The actual state of the damage was successfully estimated with high accuracy in numerical examples. The sensitivity of the objective function, as well as the appropriate penalization exponent for Young’s modulus, was discussed. Moreover, the proposed method was applied to experimentally measured wave propagation in an aluminum plate with an artificial crack, and the estimated damage state and the sensitivity of the objective function had the same tendency as the numerical example. These results demonstrate the feasibility of the proposed method.

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Ultrasonic inspection of adhesively bonded CFRP/aluminum joints using pulsed laser scanning

Cited by 26 publications

References 20 publications

Non-Contact Ultrasonic Inspection of Impact Damage in Composite Laminates by Visualization of Lamb wave Propagation

Non-Contact Ultrasonic Inspection of Impact Damage in Composite Laminates by Visualization of Lamb wave Propagation

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

Topology Optimization-Based Damage Identification Using Visualized Ultrasonic Wave Propagation

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