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Beam Parametrization of Localized Weak Debonding in a Layered Aluminum Plate

  • Leopold B. Felsen
  • Smaine Zeroug
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Obliquely incident (predominantly P-wave) beam inputs from an ultrasonic transducer into a layered bounded composite elastic plate are suitable for detection of weak debonds because they generate on the bond lines the tangential shear to which this kind of flaw responds. In previous studies, the beam-flaw interaction and scattering mechanisms were explored by expressing the fields in both the unflawed and flawed environments in terms of the set of P-SV coupled modes capable of propagating in the plate [1–5]. As may be anticipated, the reference data generated in this manner exhibited beam-like features of the fields in observational domains characterized by only a few P-SV coupled beam reflections between the outer boundaries of the perfectly bonded plate, thereby indicating that the normal modes do not parametrize the process in terms of the “observables” in the data. The problem is therefore re-parametrized here by direct beam tracking. As before [1,2], our model is two-dimensional and comprises a two-layer aluminum plate in vacuum, with a weak debond region modeled by a quasi-Gaussian pliability profile.

Keywords

Horizontal Displacement Back Propagation Scattered Field Beam Input Bond Line 
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References

  1. 1.
    I.T. Lu, L.B. Felsen, and J.M. Klosner, “Beam-to-Mode Conversion of a High Frequency Gaussian P-Wave in an Aluminum Plate in Vacuum ” Proceedings of ASME Symposium on New Directions in the Ultrasonic NDE of Advanced Materials (MD-9), Nov.27-Dec.2, 1988, Chicago, IL.Google Scholar
  2. 2.
    I.T. Lu, L.B. Felsen, J.M. Klosner, and C. Gabay, “Beam and Mode Analysis of Weak Bonding Flaws in a Layered Aluminum Plate,” “Elastic Wave Propagation” (M.F. McCarthy and M.A. Hayes, eds.), North-Holland, New York, 1989. pp. 195–203. Proceedings of the IUTAM-IUPAP Symposium on Elastic Wave Propagation, Galway, Ireland, March 20–25, 1988.Google Scholar
  3. 3.
    I.T. Lu, L.B. Felsen, and J.M. Klosner, “Observables due to Beam-to-Mode Conversion of a High Frequency Gaussian P-Wave in an Aluminum Plate in Vacuum,” to be published in J. Acoust. Soc. Am.Google Scholar
  4. 4.
    I.T. Lu, L.B. Felsen, J.M. Klosner, and C. Gabay, “Beams and Modes for Scattering from Weak Bonding Flaws in a Layered Aluminum Plate,” submitted to J. Acoust. Soc. Am.Google Scholar
  5. 5.
    I.T. Lu, L.B. Felsen, and J.M. Klosner, “Beam-to-Mode Conversion in an Aluminum Plate for Ultrasonic NDE Applications”, to be published in ASME J. of Engineering Materials and Technology.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Leopold B. Felsen
    • 1
  • Smaine Zeroug
    • 1
  1. 1.Department of Electrical Engineering and Computer Science Weber Research InstitutePolytechnic UniversityFarmingdaleUSA

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