Material Damping as a Means of Quantifying Fatigue Damage in Composites.

Abstract

The purpose of this study was to experimentally investigate the feasibility of quantifying damage in composites in terms of their damping characteristics. Bending fatigue tests were performed on ((0/+ or - 45/90)sub s)2 T300/5208 graphite-epoxy composite specimens. Testing was performed by exciting a cantilever beam so as to maintain a constant amplitude at resonance. Results indicate that the amount of damage occurring in this composite can be explained in terms of an increase in its material damping. The resonant frequency (stiffness) was found to decrease as the material damage increased. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1978
Accession Number
ADA081890

Entities

People

  • Cynthia Ann Bourne

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Composite Materials
  • Engineering
  • Epoxy Composites
  • Failure Mode And Effect Analysis
  • Fiber Reinforced Composites
  • Geometry
  • Graphite Epoxy Composites
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Mechanics
  • Micromechanics
  • Reinforced Plastics
  • Resonant Frequency

Fields of Study

  • Materials science

Readers

  • Control Systems Engineering.
  • Reinforced Composite Materials