The Thermal Properties of Composite Materials.
Final technical rept. 30 Jan 75-29 Jan 78,
OXFORD UNIV (ENGLAND) CLARENDON LAB
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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-fibreepoxy-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 matrix35 carbon-fibre composite have been measured.
- Laminates and Composite Materials