&lt;title&gt;Imaging of disbond in adhesive joints with Lamb waves&lt;/title&gt;

Mustafa, V.; Chahbaz, A.; Hay, D. Robert; Brassard, Michel; Dubois, S.

doi:10.1117/12.259048

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…This sensitivity of out-of-plane vibration has been confirmed by Mustafa et al [30] when they studied the sensitivity of disbond inspection with Lamb waves.…”

Section: Resultssupporting

confidence: 55%

Stress Estimation in Different Bone Layers Subject to Therapeutic Ultrasound in an Intelligent Bone System

Pan

Shen

Liu

et al. 2015

IEEE Trans. Instrum. Meas.

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Physiological effects caused by power ultrasound radiation are of therapeutic benefits for fracture healing. However, these effects are hard to detect with current instrumentations. The aim of this paper is to analyze the behavior of bone subject to therapeutic ultrasound and provide data reference for an intelligent bone ultrasonic system. In this paper, we adopted a 3-D finite element method as a virtual measurement tool to study the acoustic-radiation-induced stress fields inside and on the surface of bone. The equivalent long bone model was built and the soft tissue was involved by establishing coupling connections with bone surface points. The ultrasound radiation was generated by a 2-MHz excitation and was applied on the surface of soft tissue. In this paper, we first defined six paths in different bone layers to quantitatively study the longitudinal stress distribution and examined the concentration center positions and width with sliding windows. Then, the circumferential stress evolution from relaxation fields to concentration fields was investigated by computing the stress fields on cross sections. Analytical dispersion curves were measured to characterize the guided wave modes. The results show that the middle bone tissue has a higher mean stress (2027.7 Pa) than the surface (763.3 Pa) and the outer bone layer (1898.1 Pa), and the stress distribution of the middle layer is less disturbed (coefficient of variation = 39.8%). Also, on cross section of the concentration zones, periodical fields with a distance of half-wavelength are obtained. From 0.2 to 2 MHz, the acoustic intensity grows proportionally with excitation amplitude.Index Terms-Bone, finite element method (FEM), intelligent system, stress field, therapeutic ultrasound.

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“…This sensitivity of out-of-plane vibration has been confirmed by Mustafa et al [30] when they studied the sensitivity of disbond inspection with Lamb waves.…”

Section: Resultssupporting

confidence: 55%

Stress Estimation in Different Bone Layers Subject to Therapeutic Ultrasound in an Intelligent Bone System

Pan

Shen

Liu

et al. 2015

IEEE Trans. Instrum. Meas.

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“…Two situations were considered: (a) lap splice joint disbonds detected as a loss of reception signal due to the signal no longer leaking across the splice; and (b) tearstrap disbond or corrosion observed as an increase of the reception signal due to the signal no longer leaking away in the tear strap. The use of Lamb waves for disbond detection was also reported by Singher et al (1997), Mustafa and Chahbaz (1997), and Todd and Challis (1999).…”

Section: Introductionmentioning

confidence: 74%

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Giurgiutiu¹

2007

Advanced Ultrasonic Methods for Material and Structure Inspection

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The use of piezoelectric wafer active sensors (PWAS) for embedded ultrasonic nondestructive evaluation (NDE) is described. PWAS structure and principle of operation are presented. The interaction between PWAS and ultrasonic Lamb waves is modeled and analyzed, and excitation "sweet spots" for preferentially exciting certain Lamb wave modes are identified. Recent trends in guided-wave ultrasonic NDE and damage identification are briefly reviewed. Then, the use of PWAS for embedded pulse-echo detection of structural cracks is exemplified. For large area interrogation, PWAS phased arrays are used in conjunction with the embedded ultrasonics structural radar (EUSR) algorithm to create scanning Lamb wave beams. For local area interrogation, the use of PWAS in conjunction with the electromechanical (E/M) impedance method is discussed with examples of local area crack detection in circular plates and aircraft panels. Spectral classification methods based on overall statistics and neural networks are discussed. Passive PWAS usage for acoustic emission and impact detection is presented. The use of PWAS for Rayleigh wave ultrasonics is also illustrated. Finally, we evaluate the role and opportunities of PWAS as the enabling technology for large area structural health monitoring, damage detection, and embedded NDE.

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“…Guided waves have also been put forward as an alternative mean to detect weak interfaces (Kundu et al, 1998; Lowe and Crawley, 1994; Munns and Georgiou, 1995; Mustafa et al, 1996; Nagy, 1992; Nagy and Adler, 1989; Rokhlin, 1991; Rose, 2000; Smith et al, 2003). Guided waves could be considered a variant of the oblique incidence technique, as in most cases the method was implemented by moving apart the emission and the reception transducer.…”

Section: Introductionmentioning

confidence: 99%

Analytical model of lap-joint adhesive with embedded piezoelectric transducer for weak bond detection

Dugnani¹,

Chang

2016

Journal of Intelligent Material Systems and Structures

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In recent years, the aerospace and automotive industries experienced a growing interest in the implementation of structural members’ bonding using adhesive films. Adhesive joints contribute to manufacturing savings and are advantageous from a structural prospective as they provide a relatively uniform stress distribution at the bonded region, hence reducing local stress concentration. Regretfully, the adhesive bonds’ strength is vulnerable to the presence of defects which limits their use for structural purposes. A particularly dangerous class of defects—generically referred to as “kissing bond”—consists of localized imperfections that do not provide adequate bonding between the adherent and the adhesive yet maintaining the two surfaces in contact. Past attempts at detecting kissing bonds using ultrasonics were only marginally successful stressing the need to search for more reliable methods. This article describes a novel, in situ, impedance-based method for bond-line degradation detection during the service life of a structure. The method relies on piezoelectric transducers embedded within the adhesive bond-line and actuated by a low-voltage harmonic signal. The article focuses on deriving an approximate analytical model describing the dynamic behavior of the actuator embedded in the homogeneous bond-line. A study describing the sensitivity of the electro-mechanical response of the transducer to the changes in various bond-line properties and adhesion conditions is also presented.

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<title>Imaging of disbond in adhesive joints with Lamb waves</title>

Cited by 8 publications

References 6 publications

Stress Estimation in Different Bone Layers Subject to Therapeutic Ultrasound in an Intelligent Bone System

Stress Estimation in Different Bone Layers Subject to Therapeutic Ultrasound in an Intelligent Bone System

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Analytical model of lap-joint adhesive with embedded piezoelectric transducer for weak bond detection

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