Accession Number : ADA332845

Title :   Structural Response of Oxidation Resistant Carbon-Carbon Composites Under Cyclic and Monotonic Loading

Descriptive Note : Final technical rept. 15 Aug 92-14 Aug 97

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Ochoa, Ozden O.

PDF Url : ADA332845

Report Date : 14 NOV 1997

Pagination or Media Count : 50

Abstract : Oxidation damage of carbon carbon laminates at 900 deg C and its affect on shear modulus, mass loss, and electrical resistance is studied. Preferential fiber bundle oxidation with some matrix cracking is initially observed. Fiber bundles are severely damaged and increased matrix damage is observed with time. Mass loss results indicate oxidation is diffusion controlled at 9O deg C. Shear modulus decreases with increased oxidation time. Electrical resistance increases with increased oxidation time. An increase in the rate of change of the electrical resistance attributed to a change in the oxidation mechanism from preferential fiber bundle damage to matrix indicates that electrical resistance is a matrix-dominated property. A study of th relationships between electrical resistance, shear modulus, and mass loss measurements indicate that electrical resistance measurements may be used as a possible method of damage assessment of oxidation in carbon carbon.

Descriptors :   *CARBON CARBON COMPOSITES, *STRUCTURAL RESPONSE, *OXIDATION RESISTANCE, FIBERS, LAMINATES, SHEAR MODULUS, ELECTRICAL RESISTANCE.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE