Date of Award

12-1990

Document Type

Thesis

Degree Name

Master of Science in Astronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Anthony N. Palazotto, PhD

Abstract

An investigation was conducted to determine the effect of non-alpha- alumina coatings applied under varying conditions on some of the properties of silicon carbide fibers. Limited characterization of the coating by optical, scanning electron, and transmitted electron microscopy as well as energy- dispersive x-ray analysis was performed. Tensile tests were used to determine changes in elastic modulus, ultimate strength, and strain to failure of the coated fibers relative to uncoated fibers. The coatings were found to lower the mean value of the measured properties as their thickness increased, but the measurements were not accurate enough to determine if this corresponded to a simple rule of mixtures relationship or not. For the same reason, no definitive statements can be made about the properties of the coating itself. A two- dimensional plane-strain analysis incorporating thermal residual stresses was also performed to determined possible failure points.

AFIT Designator

AFIT-GA-ENY-90D-03

DTIC Accession Number

ADA230825

Comments

The author's Vita page is omitted.

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