Angular Characteristics of Reflectivity for Layered Structures With Imperfections

Pilarski, A.; Rose, Joseph L.; Balasubramaniam, Krishnan; Lecuru, D.

doi:10.1016/b978-0-408-02348-1.50023-8

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…(2) and (3), k is the wavenumber, o is the circular frequency, CL is the longitudinal wave velocity, and Cj-is the shear wave velocity. Equation (1) can be plotted numerically to obtain the known plate dispersion curves (see, for example, the procedure outlined in reference [32]). Figure 1 velocity dispersion curves for an aluminum plate.…”

Section: Guided Wave Inspection Approachmentioning

confidence: 99%

Noncontact Air-Coupled Guided Wave Ultrasonics for Detection of Thinning Defects in Aluminum Plates

Tuzzeo

Scalea

2001

Research in Nondestructive Evaluation

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Ultrasonic guided waves are gaining increasing attention for the inspection of platelike and rodlike structures. At the same time, inspection methods that do not require contact with the test piece are being developed for advanced applications. This paper capitalizes on recent advances in the areas of guided wave ultrasonics and noncontact ultrasonics to demonstrate a superior method for the nondestructive detection of thinning defects simulating hidden corrosion in thin aluminum plates.The proposed approach uses micromachined gas (air)-coupled capacitive transducers for the noncontact generation and detection of guided plate waves. Interesting features in the dispersive behavior of selected guided modes are used for the detection of plate thinning. It is shown that mode cutoff measurements provide a qualitative detection of thinning defects, while frequency shift measurements allow quantification of thinning depth. Measurement of the mode group velocity can be also used to quantify thinning depth. Similarly, thinning length can be determined by mode time-of-flight measurements.

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Section: Guided Wave Inspection Approachmentioning

confidence: 99%

Noncontact Air-Coupled Guided Wave Ultrasonics for Detection of Thinning Defects in Aluminum Plates

Tuzzeo

Scalea

2001

Research in Nondestructive Evaluation

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show abstract

“…This may be achieved by utilization of interface waves [1,2] or guided waves in the bonded plates [3][4][5]. Another possibility is the use of obliquely incident ultrasonic waves for interphase evaluation, analyzing signals in the time or frequency domains [6][7][8].…”

mentioning

confidence: 99%

Ultrasonic Reflectivity Determination of Interfacial Properties in Adhesive Joints of Aluminum Alloys

Wang

Rokhlin

1991

Review of Progress in Quantitative Nondestructive Evaluation

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Surface and Subsurface Waves for Characterization of Weakly and Highly Anisotropic Materials

Pilarski

1991

Physical Acoustics

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Angular Characteristics of Reflectivity for Layered Structures With Imperfections

Cited by 5 publications

References 6 publications

Noncontact Air-Coupled Guided Wave Ultrasonics for Detection of Thinning Defects in Aluminum Plates

Noncontact Air-Coupled Guided Wave Ultrasonics for Detection of Thinning Defects in Aluminum Plates

Ultrasonic Reflectivity Determination of Interfacial Properties in Adhesive Joints of Aluminum Alloys

Surface and Subsurface Waves for Characterization of Weakly and Highly Anisotropic Materials

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