Accession Number:

ADA303927

Title:

Ultrasonic Attenuation and Velocity in AS/3501-6 Graphite/Epoxy Fiber Composite.

Descriptive Note:

Contractor rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Report Date:

1979-12-01

Pagination or Media Count:

37.0

Abstract:

The ultrasonic group velocity and attenuation were measured as a function of frequency for longitudinal and shear waves in the epoxy matrix 3501-6 and in the principal directions of the unidirectional graphiteepoxy composite AS3501-C. Tests were conducted in the frequency ranges 0.25 MFIz to 14 MHz and 0.5 MHz to 3 MHz for longitudinal and shear wave modes, respectively. While the attenuation increased with frequency for all wave modes, the group velocity was independent of frequency for all wave modes. The effects of pressure and couplant at the transducer-specimen interface were studied and it was found that for each transducer type there exists a frequency-dependent saturation pressure corresponding to the maximum output signal amplitude. MM

Subject Categories:

  • Laminates and Composite Materials
  • Plastics
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE