Ultrasonic characterization of environmental degradation of adhesive bonds

Rokhlin, S. I.; Baltazar, Arturo; Xie, Bin; Chen, J.

doi:10.1063/1.1373875

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…26 A computer-controlled two-channel ultrasonic scanning apparatus has been developed to collect ultrasonic data over the bonded area. The acoustic array, which is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Determination of embedded layer properties using adaptive time-frequency domain analysis

Wang

Xie

Rokhlin

2002

The Journal of the Acoustical Society of America

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A general model for determination of the complete set of acoustical and geometrical properties of an isotropic layer embedded between isotropic or anisotropic multilayered solids is developed. These properties include density, longitudinal and shear elastic moduli, layer thickness, and loss factors, simultaneously determined from two measurements, one at normal and one at oblique incidence. The inversion model is an extension of the method proposed by Lavrentyev and Rokhlin [J. Acoust. Soc. Am. 102, 3467 (1997)] which is applicable to thick substrates. In this new method, the inversion model mimics an experiment by using the same time-domain gating of the signal reflected from the embedded layer. This allows application of this method to layered solids when reflections from different layers overlap in the time domain. The sensitivity of the method, its stability against data scatter, and the effect of the oblique incident angle are evaluated. The effect of plane-wave approximation versus beam approximation in the inverse algorithm is discussed. Experimental results are given to demonstrate examples of adhesive layer property reconstruction.

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“…26 A computer-controlled two-channel ultrasonic scanning apparatus has been developed to collect ultrasonic data over the bonded area. The acoustic array, which is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Determination of embedded layer properties using adaptive time-frequency domain analysis

Wang

Xie

Rokhlin

2002

The Journal of the Acoustical Society of America

Self Cite

View full text Add to dashboard Cite

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Electrochemical impedance spectroscopy inspection of composite adhesive joints

Davis¹,

Mani²,

Rich³

et al. 2005

Journal of Adhesion Science and Technology

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Lap shear joints comprised of aluminum-aluminum, aluminum-glass fiber-reinforced polymer (GFRP), aluminum-carbon fiber-reinforced polymer (CFRP), CFRP-CFRP, CFRP-GFRP and GFRP-GFRP, were exposed to 95% relative humidity (RH) at 50 • C, 70 • C and 90 • C, to salt fog and to a 90 • C/95%RH freeze cycle. Electrochemical impedance spectroscopy (EIS) spectra were taken across the whole bonded assembly using an EIS corrosion sensor. Periodically, some specimens were pulled to obtain bond strength as a function of exposure. As expected, the higher the temperature, the faster the bond degradation. The low-frequency impedance correlated with bond strength of the humidity-exposed specimens and showed the same Arrhenius dependence, suggesting that moisture absorption by the adhesive was the limiting factor in bond performance and that EIS has the potential to nondestructively track bond health and warn of deterioration.

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Electrochemical impedance evaluation of aluminum/boron–epoxy composite bonds

Davis¹

2005

Journal of Adhesion Science and Technology

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Ultrasonic characterization of environmental degradation of adhesive bonds

Cited by 3 publications

References 2 publications

Determination of embedded layer properties using adaptive time-frequency domain analysis

Determination of embedded layer properties using adaptive time-frequency domain analysis

Electrochemical impedance spectroscopy inspection of composite adhesive joints

Electrochemical impedance evaluation of aluminum/boron–epoxy composite bonds

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