NDT.net - January 1999, Vol.4 No.1

NDE of hidden flaws in aging Aircraft Structures using Obliquely Backscattered Ultrasonic Signals (OBUS)

Yoseph Bar-Cohen
Jet Propulsion Lab, Caltech, MS 82-105, 4800 Oak Grove Dr., Pasadena, CA 91109- 8099
818-394-2610, fax 818-393-4057.
Ajit K. Mal
Mechanical and Aerospace Engineering Department
University of California, Los Angeles, CA 90095, ajit@seas.ucla.edu
Marvin Lasser
Imperium, Inc., Rockville, MD 20850, lasserm@po.mctec.com
Corresponding Author Contact:
Email: yosi@jpl.nasa.gov

TABLE OF CONTENTS


Abstract

Introduction

Corrosion Characteristics

Ultrasonic Backscattering as an NDE Method

Theoretical Modeling

OBUS Real-Time Imaging of Corrosion

Conclusion

Acknowledgment

References

  1. Bar-Cohen, Y., and R. L. Crane, "Acoustic-Backscattering Imaging of Subcritical Flaws in Composites," Materials Evaluation, Vol. 40, No. 9 (1982), pp. 970-975.
  2. Chang, Z., and A. K. Mal, "A Global-Local Method for Wave Propagation Across a Lap Joint," in Numerical Methods in Structural Mechanics, ASME-AMD Vol. 204 (1995), pp. 1-11.
  3. El-Azab, A., and A. K. Mal, "A Perturbation Solution for the Interaction of Lamb Wave with Localized Surface Defects," NDE of Aging Aircraft, Airport and Aerospace Hardware, Proc. of SPIE Conf., Vol. 3397 (1998), pp. 76-86.
  4. Hagemaier, D. J., A. H. Wendelbo, and Y. Bar-Cohen, "Aircraft Corrosion and Detection Methods," Material Evaluation, Vol. 43, No. 4 (1985), pp. 426-437.
  5. Harrison, G.H., and E.K. Balcer-Kubiczek, "Uniform Pulsed Fields for Ultrasonic Bioeffect Experimentation," Ultrasonics, 29 (1991) pp. 264-267.
  6. Lasser, M., G. Harrison, "Real time, large area ultrasound imaging system using two-dimensional array technique," UT-online Journal, http://www.ndt.net/article/0398/lasser/lasser.htm (1997).
  7. Oglivy, J.A., "Theory of Wave Scattering from Random Rough Surfaces," IOP Publishing, Philadelphia, 1991.
  8. Zhang, X., G.H. Harrison, and E.K. Balcer-Kubiczek, "Exposimetry of Unfocused Pulsed Ultrasound," IEEE Trans. UFFC, Vol. 41 (1994), pp. 80-83.
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