Ultrasonic guided wave propagation across waveguide transitions: Energy transfer and mode conversion

Puthillath, Padmakumar; Galán, José M.; Ren, Baiyang; Lissenden, Cliff J.; Rose, Joseph L.

doi:10.1121/1.4795805

Cited by 40 publications

(23 citation statements)

References 11 publications

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“…Lamb waves have also been applied to characterize the quality of bonding used in various plate structures [5][6][7][8][9][10][11]. Most of foregoing studies focused on lap joints or layered plates for which the plate surfaces are bonded by adhesives.…”

Section: Introductionmentioning

confidence: 99%

Transmission of Lamb waves and resonance at an adhesive butt joint of plates

Mori

Biwa

2016

Ultrasonics

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The transmission behavior of Lamb waves and the possible occurrence of resonance at an adhesive butt joint of plates are studied experimentally. To this purpose, two 2.5-mm thick aluminum alloy plates are bonded at their edges using cyanoacrylate-based adhesive. Bonded plate specimens with different joint conditions are prepared by changing the bonding procedure. The measurements are performed for the transmission characteristics of the lowest-order symmetric (S0) and antisymmetric (A0) Lamb modes for the frequency range of 0.4-0.6MHz below the cut-off frequency of the higher-order modes. The experimental results show that the transmission coefficients of the S0 and A0 modes exhibit different frequency-dependent characteristics depending on the joint condition. Furthermore, for the incidence of the S0 mode at the center frequency of 1MHz, the transmitted S0 mode in weakly bonded specimens shows a long oscillation tail due to the resonance effect. The experimental results are discussed in the light of the theoretical results based on the spring-type interface model. The interfacial stiffnesses identified from the transmission coefficients are shown to be correlated with the bonding condition of the joint and give reasonable estimates of the resonance frequencies of weakly bonded specimens.

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Section: Introductionmentioning

confidence: 99%

Transmission of Lamb waves and resonance at an adhesive butt joint of plates

Mori

Biwa

2016

Ultrasonics

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“…This allows for higher penetration power of the transducer (simulated and physical) into the interface. This method of inspecting has been researched [5,6] but can only practically be done if there is open access to the interface side of a layer. Infinite elements (see Fig.…”

Section: Methodsmentioning

confidence: 99%

Inspectability of interfaces between composite and metallic layers using ultrasonic interface waves

Gardner

Rose²,

Koudela³

et al. 2013

Proceedings of Meetings on Acoustics

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The interface between an anisotropic composite material and a metallic material is inspected for disbonded regions using ultrasonic guided waves. The material properties of the composite and metal have been tailored to demonstrate their effect on inspectability. The material properties have been designed to be either favorable or unfavorable to the existence of propagating Stoneley waves. Stoneley waves can exist because the layer thicknesses are large enough compared to the wavelength to be considered half-spaces. The existence of Stoneley waves between generally anisotropic materials depends on the elastic constants and densities in a complicated way. The range of material properties that allow Stoneley waves is small; however, when the vertically polarized shear wave speeds are similar in the two materials, the existence of Stoneley waves is generally possible. If the conditions do not strictly allow Stoneley waves, other interface waves can still exist such as leaky waves. Disbonds are inspected using interface waves in a finite element simulation. Sensitivity to disbonds is determined and thus inspectability is demonstrated for cases that are favorable and unfavorable to Stoneley waves.

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“…It is helpful to find an index that can give an evaluation based on both sensitivity and excitability. Thus, an effectiveness index is calculated using the following equation [3], …”

Section: Effectiveness Coefficientmentioning

confidence: 99%

Ultrasonic guided wave transmission through a geometry transition and NDE of composite-to-adhesive bond

Ren

Lissenden²

2014

AIP Conference Proceedings

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Ultrasonic guided waves are important tools for inspection of adhesively bonded composites. Mode sensitivity to adhesive defects and conversion at geometry transition are considered when doing mode identification. Matching coefficients are used to prediction energy partition at the transition and compared with transmission coefficients. It verifies that matching coefficients need to combine with phase velocity matching to give reliable prediction. Finally, experiments are carried out using predicted mode-frequency combinations. Peak frequency shifts and amplitude reductions are identified as defect indicators.

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Ultrasonic guided wave propagation across waveguide transitions: Energy transfer and mode conversion

Cited by 40 publications

References 11 publications

Transmission of Lamb waves and resonance at an adhesive butt joint of plates

Transmission of Lamb waves and resonance at an adhesive butt joint of plates

Inspectability of interfaces between composite and metallic layers using ultrasonic interface waves

Ultrasonic guided wave transmission through a geometry transition and NDE of composite-to-adhesive bond

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