Acousto-Ultrasonic Wave Propagation in Composite Laminates

  • S. M. Moon
  • K. L. Jerina
  • H. T. Hahn


In the acousto-ultrasonic technique, a wave is injected onto the surface at one location and the displacement normal to the same surface is measured at another location. Thus, understanding the propagation characteristics of the wave is essential for successful application of the technique. The main objective of the present investigation is to identify through analysis-experiment correlation how the AU wave propagates through composite laminates.

Lamb wave speeds were calculated in the low frequency region for a unidirectional graphite/ epoxy laminate. For wave propagation in off-axis directions transverse displacement was assumed zero. An experimental verification was carried out by measuring the wave speeds on the upper and lower surfaces of the specimen. The changes of the wave velocity and attenuation with frequency were monitored. Fourier spectra of the received signal were obtained using a wave analyzer to study the dispersion.

It has been found that the dominant AU waves produced experimentally were Lamb waves. The wave velocity changed with the fiber direction in the predicted manner. The maximum attenuation was obtained in the 22.5° fiber direction while the minimum attenuation was observed parallel to the fibers.


Wave Velocity Acoustic Emission Attenuation Coefficient Peak Amplitude Fiber Orientation 
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  1. 1.
    C. T. Sun, J. D. Achenbach, and G. Herrman, Time-harmonic Waves in a Stratified Medium Propagating in the Direction of the Layering, J of Appl Mech. 35:408 (1968).CrossRefGoogle Scholar
  2. 2.
    H. Lamb, On Waves on Elastic Plates, Proc. Royal Soc. A. 93:114 (1917).ADSzbMATHCrossRefGoogle Scholar
  3. 3.
    H. F. Pollard, “Sound Waves in Solids”, Pion Limited, London (1977).Google Scholar
  4. 4.
    I. A. Viktrove, “Rayleigh and Lamb Wave,” Plenum Press, New York (1967).Google Scholar
  5. 5.
    J. H. Hemann and G. Y. Baaklini, “The Effect of Stress on Ultrasonic Pulses in Fiber Reinforced Composites, NASA CR-3724,” NASA, Cleveland (1983).Google Scholar
  6. 6.
    C. C. Habeger, R. W. Mann, and G. A. Baum, “Ultrasonic Plate Waves in Paper,” Ultrasonics, 3:57 (1979)CrossRefGoogle Scholar
  7. 7.
    L. J. Bond and N. Saffari, Crack Characterization in Turbine Disks, in: “Review of Progress in Quantitative Nondestructive Evaluation, Vol. 3A,” D. O. Thompson and D. E. Chimenti, eds., Plenum Press, New York (1984).Google Scholar
  8. 8.
    A. Fahr, S. Johar, and M. K. Murthy, Surface Acoustic Wave Studies of Surface Cracks, in: “Review of Progress in Quantitative Nondestructive Evaluation, Vol. 3A,” D. O. Thompson and D. E. Chimenti, eds., Plenum Press, New York (1984).Google Scholar
  9. 9.
    D. C. Worlton, “Experimental Confirmation of Lamb Waves at Mega Cycle Frequencies,” J. Appl. Phy. 32:967 (1961).ADSCrossRefGoogle Scholar
  10. 10.
    F. C. Moon, Wave Propagation and Impact in Composite Materials, in: “Mechanics of Composite Materials, Vol. 7,” C. C. Chamis, ed., New York (1974).Google Scholar
  11. 11.
    C. Sve, “Time-Harmonic Wave Traveling Obliquely in Periodically Laminated Medium,” J. Appl. Mech. 38:477 (1971).ADSCrossRefGoogle Scholar
  12. 12.
    W. Kohn, “Propagation of Low-Frequency Elastic Disturbances in Composite Materials,” J, Appl. Mech. 41:97 (1974).zbMATHCrossRefGoogle Scholar
  13. 13.
    J. C. Peck and G. A. Gurtman, “Dispersive Pulse Propagation Parallel to the Interfaces of a Laminated Composite,” J. Appl. Mech. 36:479 (1969).ADSzbMATHCrossRefGoogle Scholar
  14. 14.
    J. S. Whitter and J. C. Peck, “Experiments on Dispersive Pulse Propagation in a Laminated Composites and Comparison with Theory,” J. Appl. Mech. 36:485 (1969).ADSCrossRefGoogle Scholar
  15. 15.
    J. D. Achenbach, Waves and Vibration in Composites, in: “Mechanics of Composite Materials, Vol. 2,” G. P. Sendeckyji, ed., Academic Press, New York (1974).Google Scholar
  16. 16.
    S. Serabian, “Influence of Attenuation Upon the Frequency Content of Stress Wave Packet,” JASA 42:1052 (1967).CrossRefGoogle Scholar
  17. 17.
    S. Serabian, “Implication of the Attenuation-Produced Pulse Distortion Upon the Ultrasonic Method of Nondestructive Testing,” Matl Eval. 26:173 (1968).Google Scholar
  18. 18.
    M. Knight, “Three-Dimensional Elastic Moduli of Graphite/Epoxy Cormposites,” J. Comp Matl 16:153 (1982).CrossRefGoogle Scholar
  19. 19.
    R. M. Jones, “Mechanics of Composite Materials,” Scripta Book Company, Washington, DC (1975).Google Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • S. M. Moon
    • 1
  • K. L. Jerina
    • 1
  • H. T. Hahn
    • 2
  1. 1.Department of Mechanical EngineeringWashington UniversitySt. LouisUSA
  2. 2.Dept. of Engineering Science and MechanicsThe Pennsylvania State UniversityUniversity ParksUSA

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