Ultrasonic Measurements of Pretreated Aluminium Joints Durability during Hot Cycles

Belloncle, Valentina Vlasie; Rousseau, Martine

doi:10.1080/09349840802610139

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Researchers have observed nearly 40% change in the dynamic moduli of epoxies associated with these exposures, 48 though an upper bound of 20% change relative to nominal values after cure is more commonly reported. 41,43,47,52 The density of epoxy adhesives typically tends to vary by \5% of initial values. [47][48][49][50] Individual properties of the adhesive layer in the FE model of Figure 8(a) were adjusted up to the above-mentioned bounds while keeping all other material properties the same.…”

Section: Sensitivity To Changes In the Properties Of The Adhesive Layermentioning

confidence: 99%

Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers

Attarian

Cegla

Cawley

2014

Structural Health Monitoring

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Industrial interest in structural health monitoring of safety-critical assets is increasing. Guided wave structural health monitoring shows potential for practical use as it allows detection of small defects (1.5% reflection changes) in the presence of environmental changes. Guided wave structural health monitoring systems use bonded piezoelectric sensors to monitor wave propagation patterns and subtraction between signals and baselines from the ''healthy'' structure for robust discrimination of damage. Long-term stability of structural health monitoring using these techniques has been investigated in this article as this is essential for industrial deployment of a system. Plates that were exposed to thermal cycling in an environmental chamber were monitored using bonded S0 mode sensors operating in pitch catch. Analysis of structural health monitoring data revealed drifts in baseline subtraction results corresponding to progressive reduction in defect sensitivity levels. These drifts were correlated with increases in coherent variability and suspected to be due to variations in the adhesive properties of the bonds between the sensors and the structure. Finite element analysis and further experimental results confirmed that changes in adhesive properties were a likely cause of the degradation in monitoring capability with time.

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Section: Sensitivity To Changes In the Properties Of The Adhesive Layermentioning

confidence: 99%

Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers

Attarian

Cegla

Cawley

2014

Structural Health Monitoring

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“…For these values, the theoretical frequencies of the other ZGV modes fit the measured Similar values for the longitudinal stiffness are found in the literature for aluminium/epoxy interface. [21,22] The ratio K T /K L equal to 0.11 is much lower that the values of 0.7 to 0.8 reported by Cantrell. [23] However this ratio is close to the value 0.16 measured by Guo et al , in the case of a film deposited on a steel substrate.…”

Section: Methodsmentioning

confidence: 53%

Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes

Mézil

Bart

Raetz

et al. 2015

The Journal of the Acoustical Society of America

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Zero-Group Velocity (ZGV) Lamb waves are studied in a structure composed of two plates bonded by an adhesive layer. The dispersion curves are calculated for a Duralumin/epoxy/Duralumin sample, where the adhesion is modeled by a normal and a tangential spring at both interfaces. Several ZGV modes are identified and their frequency dependence on interfacial stiffnesses and on the bonding layer thickness is numerically studied. Then, experiments achieved with laser ultrasonic techniques are presented. Local resonances are measured using a superimposed source and probe. Knowing the thicknesses and elastic constants of the Duralumin and epoxy layers, the comparison between theoretical and experimental ZGV resonances leads to an evaluation of the interfacial stiffnesses. A good agreement with theoretical dispersion curves confirms the identification of the resonances and the parameter estimations. This non-contact technique is promising for the local evaluation of bonded structures.

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Long-term structural health monitoring of plate-like structures using distributed guided wave sensors

Attarian¹

2013

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Ultrasonic Measurements of Pretreated Aluminium Joints Durability during Hot Cycles

Cited by 3 publications

References 25 publications

Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers

Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers

Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes

Long-term structural health monitoring of plate-like structures using distributed guided wave sensors

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