Acoustical methods for the investigation of adhesively bonded structures: A review

Maeva, E.; Severina, I.; Bondarenko, S. A.; Chapman, Gilbert B.; O’Neill, Brian E.; Severin, F.; Maev, Roman Gr.

doi:10.1139/p04-056

Cited by 79 publications

(36 citation statements)

References 118 publications

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“…However, the hazardous nature of these methods still constrains their application on site. Ultrasonics are easily portable and are sensitive to delaminated interfaces due to the quasi-specular wave reflection at air/solid interfaces (Maeva et al 2004). In the case of wood, the coupling of energy between transducers and sample is problematic, since agents such as gel, grease, or liquid may penetrate the latter.…”

Section: Introductionmentioning

confidence: 99%

Air-coupled ultrasound inspection of glued laminated timber

et al. 2011

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A novel air-coupled ultrasound (ACU) 120 kHz normal transmission system enabled successful imaging of bonding and saw cut defects in multilayered glulam beams up to 280 mm in height with a signal-to-noise ratio (SNR) of 40 dB. The main wave propagation paths were modeled; quasi-longitudinal and quasi-transverse modes were coupled in each lamella and the sound field was found to be shifted from the insonification axis as a function of the ring angle, leading to interference of wave paths in the receiver and to 15 dB amplitude variability in defect-free glulam. The assessment was improved with spatial processing algorithms that profited from the arbitrary scanning resolution and high reproducibility of ACU. Overlapped averaging reduced inband noise by 15 dB, amplitude tracking captured only the first incoming oscillation, thus minimizing diffraction around defect regions, and image normalization compensated 6 dB of systematic amplitude variability across the fiber direction. The application of ACU to in situ defect monitoring was demonstrated by using multiparameter difference imaging of measurements of the same sample with and without saw cut defects. The segmentation of the defect geometry was improved significantly and the amplitude variability was reduced by 10 dB. Further work is planned to model additional insonification setups and grain and density heterogeneities.

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Section: Introductionmentioning

confidence: 99%

Air-coupled ultrasound inspection of glued laminated timber

et al. 2011

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“…Enhancement of the sensitivity of ultrasonics to bond conditions was obtained using a resonance approach (ultrasonic resonance spectroscopy) and some sensitivity to kissing bonds has actually been demonstrated [10][11][12]. By additional modelling of the resonating structure, the adhesion or specific stiffness parameters introduced with the model were found to correlate with the adhesion strength in the case of weakly bonded metals [13].…”

Section: Introductionmentioning

confidence: 99%

Adhesive bond testing of carbon–epoxy composites by laser shockwave

Perton

Blouin

Monchalin

2010

J. Phys. D: Appl. Phys.

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Adhesive bonding, particularly of composite laminates, presents many practical advantages when compared with other joining methods but its use is limited, since there is presently no non-destructive inspection technique to ensure the quality of the bond. We are developing a technique based on the propagation of high amplitude ultrasonic waves to evaluate the adhesive bond strength at high strain rate. Compression waves are generated by a short and powerful laser pulse under water confinement and are converted after reflection on the assembly back surface into tensile waves. The resulting tensile forces normal to the interfaces can cause a delamination inside the laminates or a disbond. The adhesion strength is probed by increasing the laser pulse energy until disbond. A good bond is unaffected by a certain level of stress whereas a weaker one is damaged. The method is shown completely non-invasive throughout the whole composite assembly. The sample back surface velocity is measured by an optical interferometer and used to estimate stress history inside the sample. The depth and size of the disbonds are revealed by a post-test inspection by the well established laser-ultrasonic technique. Experimental results confirmed by numerical simulations show that the proposed method is able to differentiate weak bonds from strong bonds and to estimate quantitatively the bond strength.

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“…The propagation of guided wave in solid cylindrical media has already been widely studied, but most work is based on a model of a multilayered columnar structure with continuous interface [5][6][7][8] , few attention has been focused on the semi-infinite space structure with discontinuous interface [9][10] .…”

Section: Introductionmentioning

confidence: 99%

Guided Waves in a Solid Rod Embedded in Infinite Medium with Weak Interface

Tong

Han

Yin

et al. 2016

MATEC Web of Conferences

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Abstract. The dispersion relation of the infinite long rod model with a weak interface has been deduced via wave equation of the guided waves and boundary spring interface model. The dispersion characteristics of the rigid interface and the slip interface are calculated, while the effect of different axial stiffness coefficient is also discussed.The results suggest that the phase velocity of the slip interface decreases slowly with increasing frequency at the low frequency of the L (0,1) mode. As for the weak interface, when the axial coefficient Kt is in the particular range of [10 10 ,10 14 ]pa/m, the interface turns from the slip interface to the rigid interface. That shows the value of axial coefficient Kt is an essential prerequisite for the non-destructive evaluation to evaluate the interface cementation degree.

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Acoustical methods for the investigation of adhesively bonded structures: A review

Cited by 79 publications

References 118 publications

Air-coupled ultrasound inspection of glued laminated timber

Air-coupled ultrasound inspection of glued laminated timber

Adhesive bond testing of carbon–epoxy composites by laser shockwave

Guided Waves in a Solid Rod Embedded in Infinite Medium with Weak Interface

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