Thermomechanical fatigue behavior of a silicon carbide fiber-reinforced calcium aluminosilicate composite

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04022.x· OSTI ID:5519202

Butkus, L M; Holmes, J W ^[1]; Nicholas, T ^[2]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Ceramic Composites Research Lab.
2. WL/MLLN, Wright-Patterson AFB, OH (United States). Materials Behavior Branch

Isothermal fatigue and in-phase thermomechanical fatigue (TMF) tests were performed on a unidirectional, continuous-fiber, Nicalon-reinforced calcium aluminosilicate glass-ceramic composite ([0][sub 16], SiC/CAS-2). Monotonic tensile tests were performed at 1,100 C and 1,000 MPa/s to determine the material's ultimate strength ([sigma][sub ult]) and proportional limit ([sigma][sub pl]). Isothermal fatigue tests at 1,100 C employed two loading profiles, a triangular waveform with ramp times of 60 s and a similar profile with a superimposed 60-s hold time at [sigma][sub max]. All fatigue tests used a [sigma][sub max] of 100 MPa (40% of [sigma][sub pl]), R = 0.1. TMF loading profiles were identical to the isothermal loading profiles, but the temperature was cycled between 500 and 1,100 C. All fatigued specimens reached run-out and were tested in tension at 1,100 C immediately following the fatigue tests. Residual modulus, residual strength, cyclic stress-strain modulus, and strain accumulation were all examined as possible damage indicators. Strain accumulation allowed for the greatest distinction to be made among the types of tests performed. Fiber and matrix stress analyses and creep data for this material suggest that matrix creep is the primary source of damage for the fatigue loading histories investigated.

• OSTI ID: 5519202
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALCIUM COMPOUNDS
CALCIUM SILICATES
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FATIGUE
FIBERS
MATERIALS
MECHANICAL PROPERTIES
OXYGEN COMPOUNDS
SILICATES
SILICON CARBIDES
SILICON COMPOUNDS
STRESS ANALYSIS