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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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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