Journal Article10.1016/S0963-8695(00)00022-0
Characterization of adhesive bond properties using Lamb waves
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TL;DR: In this paper, the authors combine laser ultrasonic techniques with the two-dimensional Fourier transform (2D-FFT) to characterize adhesive bond properties and quantitatively track changes in the bonded specimens, as a function of age.
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Abstract: This research combines laser ultrasonic techniques with the two-dimensional Fourier transform (2D-FFT) to characterize adhesive bond properties. The experimental procedure consists of measuring a series of equally spaced, transient Lamb waves in specimens consisting of aluminum plates joined with an adhesive bond. The frequency spectrum (dispersion curves) for each specimen are obtained by operating on these transient waveforms with the 2D-FFT. This study quantifies the effect of bond stiffness on the dispersion curves of two different bonded specimens (a single aluminum plate with an adhesive transfer tape attached to one side, and two aluminum plates joined with the same adhesive tape) and four adhesive bond conditions (un-aged, and three different aging temperatures and times). The proposed procedure consists of first determining the frequency spectrum of the Lamb waves that propagate in each of the two bonded specimens (plus a single plate); these measurements provide the dispersion curves for each specimen in their un-aged state. Degradation causes changes in the stiffness of an adhesive bond, which causes changes in the dispersion curves of the aged specimens. Experimentally measured dispersion curves are used to quantitatively track changes in the bonded specimens, as a function of age. Finally, these experimental results are interpreted in terms of an analytical model that replaces the adhesive bond layer with a linear spring boundary condition.
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Citations
Research on a Defects Detection Method in the Ferrite Phase Shifter Cementing Process Based on a Multi-Sensor Prognostic and Health Management (PHM) System.
TL;DR: It was verified by subsequent process that the on-line detection system improved the reliability of the ferrite phase shifter cementing process and reduced the incidence of insufficient cementing strength defects.
Monitoring of the process of constitution of a putty coating on a vehicle body with the use of an ultrasonic method
Dariusz Ulbrich,Marian Jósko,Jakub Kowalczyk +2 more
- 01 Jan 2014
TL;DR: In this article, changes in the longitudinal wave reflection coefficient for three areas of bonding were determined, each of which had the surface prepared in a different way, and it was found that the ultrasonic method utilizing a longitudinal wave allows monitoring of the process of constitution of the bond between the putty coating and the body surface and enables to determine the curing time of adhesive connection and allows detecting defective adhesive bonds and eliminating them in the stage of production.
Second-harmonic generation of Lamb waves in a solid layer on a half space
Mingxi Deng,Ping Wang,Xiafu Lv +2 more
- 23 Aug 2004
TL;DR: In this article, the authors developed an effective approach for studying second-harmonic generation of Lamb waves in the composite structure consisting of a solid layer on a half space using a second-order perturbation approximation and a modal expansion analysis approach.
•Dissertation
Damage Detection in Blade-Stiffened Anisotropic Composite Panels Using Lamb Wave Mode Conversions
II Anthony James Vizzini
- 01 Jan 2012
TL;DR: The use of piezoelectric transducers along with guided Lamb waves is a method that has received a lot of attention due to the weight, cost, and function of the systems based on these elements as mentioned in this paper.
References
A two-dimensional Fourier transform method for the measurement of propagating multimode signals
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this article, a two-dimensional Fourier transform (2D FFT) was used to measure the amplitudes and velocities of the Lamb waves propagating in a plate, the output of the transform being presented using an isometric projection which gives a three-dimensional view of the wave-number dispersion curves.
990
Nondestructive evaluation of adhesive joints by guided waves
Peter B. Nagy,Laszlo Adler +1 more
TL;DR: In this paper, a simple experimental technique based on ultrasonic transmission mesurement is introduced to detect leaky guided modes in the interface layer, which might find numerous applications in nondestructive evaluation of different bonds of layered structure such as brazed joints.
95
Guided waves in layered solids with interface zones
TL;DR: In this paper, a matrix method is presented for the solution of elastic wave propagation problems in multilayered isotropic solids containing imperfectly welded interfaces, where interfacial traction is assumed to be proportional to the displacement jump across the interface.
88
Ultrasonic Guided Waves For NDE of Adhesively Bonded Structures
TL;DR: In this paper, a Double Spring Hopping Probe is designed to achieve excellent contact on a curved aircraft structure, and a guided wave resonance tuning concept for frequency is also discussed with respect to attaining reliable bond integrity measurements.
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