Title page for ETD etd-06232009-063055
|Type of Document
||Jackson, Mitchell L
||The microwave frequency permittivity of thermoplastic composite materials
||Master of Science
|Stern, Curtis H.
|Kriz, Ronald D.
|Loos, Alfred C.
|Date of Defense
Mixture models were studied in an effort to predict the
microwave frequency permittivities of unidirectional-fiber-reinforced
thermoplastic-matrix composite materials as a
function of fiber volume fraction, fiber orientation relative
to the electric field, and temperature. The permittivities
of the constituent fiber and plastic materials were measured
using a resonant cavity perturbation technique at 9.4 GHz and
2.45 GHz. The permittivities of the composite specimens were
measured using a reflection cavity technique at 9.4 GHz and
2.45 GHz. Simple" rule of -mixtures II models that use the
fiber and plastic permittivities have been found to
approximate the complex dielectric properties of the
composite for varied fiber volume fractions. The
permittivities of oriented composites were successfully
modeled at 9.4 GHz using a tensor rotation procedure.
Composite permittivities were modeled with temperature up to
the glass transition temperature of the thermoplastic matrix.
Good agreement was found between the mixture model and
experimental results for permittivity as a function of
temperature at 9.4 GHz.
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