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

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 graphite/epoxy composite (AS/3501-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)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA303927

Entities

People

  • Hamid Nayeb-hashemi
  • James H. Williams Jr.
  • Samson S. Lee

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Counter IED

DTIC Thesaurus Topics

  • Composite Materials
  • Epoxy Composites
  • Frequency
  • Graphite Epoxy Composites
  • Graphitic Materials
  • Group Velocity
  • Laminates
  • Materials
  • Materials Processing
  • Measurement
  • Mechanical Properties
  • Phase Velocity
  • Secondary Waves
  • Stress Waves
  • Tensile Strength
  • Wave Packets
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Structural Health Monitoring of Composite Structures.