Accession Number:

ADA330014

Title:

Thermomechanical Analysis of Carbon-Carbon Composites Evaluation Report

Descriptive Note:

Final technical rept. 15 Aug 93-14 Aug 97

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF AEROSPACE ENGINEERING

Personal Author(s):

• Whitbomb, John
• Ochoa, Ozden

Report Date:

1997-08-01

Pagination or Media Count:

5.0

Abstract:

A three-dimensional progressive failure analysis was developed to predict the stiffness and strength of oxidation-resistant carbon-carbon composites subjected to thermal and mechanical loads. Both plain and satin weave composites were studied. A continuum damage modeling strategy was used. However, the shapes of the predicted zones often were crack-like. The tow crossover region was identified as a critical region for damage initiation. Matrix cracking and debonding between the tows was predicted. The fiber architecture was shown to have a large influence on stiffness, when damage occurred, and the type of damage. The analysis provides detailed information about damage initiation and growth. Of course, the predictions can be no better than the input data. The current program developed key analytical capabilities and demonstrated the sensitivity of the CC composite behavior to various parameters. To go further will require improved experimental data that will either validate the analysis or indicate aspects that require refinement.

Descriptors:

• *THERMOMECHANICS
• *CARBON CARBON COMPOSITES
• STIFFNESS
• CRACKING(FRACTURING)
• CARBON FIBERS
• STRUCTURAL RESPONSE
• OXIDATION RESISTANCE
• FAILURE(MECHANICS)
• THERMAL STRESSES
• FIBER REINFORCEMENT

Subject Categories:

• Laminates and Composite Materials
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE