Structural response of oxidation resistant carbon-carbon composites

Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references: p. 94-95.Issued also on microfiche from Lange Micrographics.Since carbon-carbon composites maintain their strength at high temperatures, they are attractive candidates for high temperature applications. Although, in oxygen rich environments at temperatures above 500'C, carbon-carbon composites will oxidize without a protective coating to seal the laminate from oxygen penetration. The outer protective coatings do not provide complete protection against oxidation. Secondary protection agents such as boron carbide particulates are added to the substrate and used in conjunction with the coatings in order to enhance the oxidation resistance. The effectiveness of these particulates has not yet been qualitative and quantitatively measured. Herein, analytical models are developed using homogenization techniques, and unit cell methodology to determine the constitutive response of the carbon-carbon laminate with the inhibitors. These analytical models are used to study the effects of progressive failure, material defects, and oxidation on this material system subjected to thermo-mechanical loading. The analytical models are compared to test data to verify the predictions of the lamina response. The material system studied is HITCO 2D CC137EH, highly inhibited, eight harness satin weave, RT42 CVD SiC coated carbon-carbon laminate