SYMPOSIA PAPER Published: 01 January 1992

Thermomechanical Testing of High-Temperature Composites: Thermomechanical Fatigue (TMF) Behavior of SiC(SCS-6)/Ti-15-3


Thermomechanical testing techniques recently developed for monolithic structural alloys were successfully extended to continuous fiber-reinforced composite materials in plate form. The success of this adaptation was verified on a model metal-matrix composite (MMC) material, namely SiC(SCS-6)/Ti-15V-3Cr-3Al-3Sn. The effects of heating system type and specimen preparation are also addressed. Cyclic lives determined under full thermomechanical conditions were shown to be significantly reduced from those obtained under comparable isothermal and in-phase bithermal conditions. Fractography and metallography studies of specimens subjected to isothermal, out-of-phase, and in-phase conditions revealed distinct differences in damage/failure modes. Isothermal metallography revealed extensive matrix cracking associated with fiber damage throughout the entire cross section of the specimen. Out-of-phase metallography revealed extensive matrix damage associated with minimal (if any) fiber cracking. However, the damage was located exclusively at surface and near-surface locations. In-phase conditions produced extensive fiber cracking throughout the entire cross section, associated with minimal (if any) matrix damage.

Author Information

Castelli, MG
Sverdrup Technology, Inc., NASA LeRC Group, Brook Park, OH
Bartolotta, P
NASA Lewis Research Ctr., Cleveland, OH
Ellis, JR
NASA Lewis Research Ctr., Cleveland, OH
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Developed by Committee: D30
Pages: 70–86
DOI: 10.1520/STP20146S
ISBN-EB: 978-0-8031-5184-0
ISBN-13: 978-0-8031-1426-5