Relation of Ultrasonic Energy Loss Factors and Constituent Properties in Unidirectional Composites.

Abstract

A model is developed relating composite constituents properties with ultrasonic energy loss factors for longitudinal waves propagating in the principal directions of a unidirectional graphite/epoxy fiber composite. All the constituents are assumed to behave as linear viscoelastic materials with energy dissipation properties defined by loss factors. It is found that by introducing a new constituent called the interface material, the composite and constituent properties can be brought into consistency with simple series and parallel models. An expression relating the composite loss factors to the loss factors of the constituents is derived and its coefficients are evaluated. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA305673

Entities

People

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

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Coefficients
  • Composite Materials
  • Consistency
  • Graphitic Materials
  • Materials
  • Unidirectional

Readers

  • Computational Fluid Dynamics (CFD)
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Structural Dynamics.