The Thermal Properties of Composite Materials.

Abstract

The thermal expansion behaviour of composites consisting of copper spheres in epoxy and glass ballotini in epoxy has been investigated from 77 K up to about 450 K using a capacitative technique. The effect of the size of the particles on the thermal expansion of the composite has been observed for both copper and glass fillers. For composites with the same volume concentration of filler, the thermal expansion above approx. 360 K (90 C) is less for composites containing small particles. The effect is to a certain extent dependent on the rate of heating and it appears to be associated with a suppression of the onset of the glass-plastic transition in specimens containing small particles. The thermal expansion of carbon-fibre/epoxy-resin composites has been measured from 20 to 400 K for specimens in which the fibres were unidirectional and also for those in which they were laid in layers crossed at 90 deg to one another. The thermal expansion and conductivity of a sample of a Mg matrix/35% carbon-fibre composite have been measured.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1978
Accession Number
ADA061105

Entities

People

  • H. M. Rosenberg

Organizations

  • University of Oxford

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Carbon Fibers
  • Composite Materials
  • Conductivity
  • Epoxy Resins
  • Glass Transition Temperature
  • Graphitic Materials
  • Low Temperature
  • Materials
  • Measurement
  • Mechanical Properties
  • Particle Size
  • Temperature Gradients
  • Tensile Strength
  • Thermal Conductivity
  • Thermal Expansion
  • Thermal Properties
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Plasma Physics.
  • Reinforced Composite Materials