Corrosion detection in welds and heat-affected zones using ultrasonic Lamb waves

Sargent, J. P.

doi:10.1784/insi.2006.48.3.160

Cited by 52 publications

(34 citation statements)

References 6 publications

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“…Similar mode-localization has also been proposed for the general threedimensional problem where 'transverse' features are located perpendicular to the wave propagation direction [10]. For example, recently guided waves localized in transverse cross-section changes [11] have been demonstrated and are attractive for the inspection of long weld segments [12,13].…”

Section: Introductionmentioning

confidence: 74%

Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends

et al. 2015

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Section: Introductionmentioning

confidence: 74%

Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends

et al. 2015

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“…The geometrical profile of the weld cap, presenting a local increase in the thickness of the plate, allows the existence of just such modes. This was found first by observation of a compression-like mode [13], which is dispersive, partially-trapped at low frequencies, and perfectly-trapped at high frequencies. This geometry was then investigated by model and further experiments, showing the existence of both the compression-like mode and a perfectly-trapped shear-like mode with very little dispersion [14,15].…”

Section: Introductionmentioning

confidence: 83%

Feature-guided waves for monitoring adhesive shear modulus in bonded stiffeners

Fan

Castaings

Lowe

et al. 2013

NDT & E International

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Adhesively bonded stiffeners are employed in aerospace applications to increase structural stiffness. The potential of feature-guided wave modes for the verification of adhesion and curing state in difficult-to-access regions has been investigated. The properties of guided wave modes propagating along a T-shaped stiffener bonded to an aluminium plate were calculated using the Semi-Analytical Finite Element (SAFE) method. Feature-guided modes dominated by shearing motion were identified to be well suited, with energy concentrated at the stiffener and bond line, limiting energy radiation into the plate and thus maximising inspection length. The influences of the bond line stiffness and thickness on the guided wave behaviour were investigated using SAFE and 3D Finite Element calculations, and found to be significant. Experiments were conducted to measure the properties of the guided waves during the curing of an epoxy joint attaching a stiffener to a plate. The feature-guided mode was excited using a piezo-electric shear transducer and measured using a laser interferometer. The measured phase speed changed significantly during curing. The frequency dependency was found to match well with the SAFE calculations for a variation of the shear (Coulomb) modulus of the adhesive. The potential of the featureguided shear wave mode for bond line inspection and monitoring has been shown and the choice of guided wave mode and frequency range for good sensitivity to the bond line state discussed.

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“…From our calculation, several weld-guided modes have been found in the low-frequency range. In this paper, we will compare and discuss only two fundamental modes, one is the compression mode, which has previously been discovered experimentally (Sargent 2006), and the other is a new interesting mode, which has a similar mode shape as the SH0 mode in the plate.…”

Section: (A ) Model Descriptionmentioning

confidence: 99%

“…However, a recent experimental observation (Sargent 2006) on a large welded plate has revealed that there existed 'weld-guided' modes that can propagate along the weld and concentrate the energy in and around the weld. Similar trapped modes have also been discovered by Postnova & Craster (2008) from an analytical calculation on a welded plate structure based on the longwave theory.…”

Section: Introductionmentioning

confidence: 99%

Elastic waves guided by a welded joint in a plate

Fan

Lowe

2009

Proc. R. Soc. A.

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The inspection of large areas of complex structures is a growing interest for industry. An experimental observation on a large welded plate found that the weld can concentrate and guide the energy of a guided wave travelling along the direction of the weld. This is attractive for non-destructive evaluation (NDE) since it offers the potential to quickly inspect for defects such as cracking or corrosion along long lengths of welds. In this paper, a twodimensional semi-analytical finite-element (SAFE) method is applied to provide a modal study of the elastic waves that are guided by the welded joint in a plate. This brings understanding to the compression wave that was previously observed in the experiment. However, during the study, a shear weld-guided mode, which is non-leaky and almost non-dispersive, has also been discovered. Its characteristics are particularly attractive for NDE, so this is a significant new finding. The properties for both the compression and the shear mode are discussed and compared, and the physical reason for the energy trapping phenomena is then explained. Experiments have been undertaken to validate the existence of the shear weld-guided mode and the accuracy of the FE model, showing very good results.

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Corrosion detection in welds and heat-affected zones using ultrasonic Lamb waves

Cited by 52 publications

References 6 publications

Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends

Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends

Feature-guided waves for monitoring adhesive shear modulus in bonded stiffeners

Elastic waves guided by a welded joint in a plate

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