Title page for ETD etd-09082012-040520

Type of Document Master's Thesis
Author Knott, Tamara Wright
URN etd-09082012-040520
Title Effect of fiber morphology on composite properties
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Herakovich, Carl T. Committee Chair
Griffin, Odis Hayden Jr. Committee Member
Pinders, M. Jeff Committee Member
  • Composite materials
Date of Defense 1988-05-05
Availability restricted

The effect of the cylindrically orthotropic morphology known to exist in graphite fibers on the effective properties of a composite material was studied using the composite cylinder assemblage model. The cylindrical orthotropy of the fibers was found to have no effect on the properties of a composite with purely orthotropic fibers. For fibers with a transversely isotropic core both the size of the core and the morphology of the sheath were found to have an effect on the composite properties.

The stress states resulting in the composite cylinder for axiai, radial, axiai shear, and thermal loads were examined. Singular stresses were observed to occur at r=0 in some fibers in some load conditions. The presence of a transversely isotropic core, which must exist in a real fiber, removed this singularity.

The strength of the composite cylinder was found to depend on über morphology. The size of the transversely isotropic core within the über also affected the strength. The strength of the über increased with increasing transversely isotropic core size in some instances. In general, for axiai loading failure is expected to be caused by fiber breakage. For radial, axiai shear, and thermal loading the failure mode is über splitting.

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