INTEGRATED RESEARCH ON CARBON COMPOSITE MATERIALS. PART I

Abstract

Both resin and metal matrix composites with high modulus carbon fibers are being developed. Chemical etchants which roughen the fiber surface have approximately doubled the compressive strength of resin rings. Contact angle and wicking rate tests are used to evaluate surface treatments. Various coatings (best: Ta) improve wetting with aluminum, but brittle intermetallic phases degrade composite properties. Nickel matrix composites have near theoretical modulus and 1/2 theoretical strength. The effect of random fiber spacing on calculated composite moduli is being studied. Curing stresses and stress concentrations at fiber ends have been measured photoelastically. Improved test concepts have been formulated for uni-and bidirectional composites. Discrete element methods of structural analysis, a transient temperature analysis capability, and a statistical theory of strength have been extended to include material anisotropy. New structural synthesis algorithms are being investigated.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1966
Accession Number
AD0803525

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Airframes
  • Chemical Synthesis
  • Chemistry
  • Elastic Properties
  • Heat Transfer
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Stress Strain Relations
  • Surface Properties
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Reinforced Composite Materials
  • Thin Film Deposition Science.

Technology Areas

  • Space