Materials characterization of silicon carbide reinforced titanium (Ti/SCS-6) metal matrix composites. Part 2: Theoretical modeling of fatigue behavior

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02669452· OSTI ID:205257

Chiang, K T; Loh, D H ^[1]; Liaw, P K ^[2]; Diaz, E S ^[3]

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1. Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.
2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
3. Westinghouse Science and Technology Center, Pittsburgh, PA (United States)

Flexural fatigue behavior was investigated on titanium (Ti-15V-3Cr) metal matrix composites reinforced with cross-ply, continuous silicon carbide (SiC) fibers. The titanium composites had an eight-ply (0, 90, +45, {minus}45 deg) symmetric layup. Mechanistic investigation of the fatigue behavior is presented in Part 1 of this series. In Part 2, theoretical modeling of the fatigue behavior was performed using finite element techniques to predict the four stages of fatigue deflection behavior. On the basis of the mechanistic understanding, the fiber and matrix fracture sequence was simulated from ply to ply in finite element modeling. The predicted fatigue deflection behavior was found to be in good agreement with the experimental results. Furthermore, it has been shown that the matrix crack initiation starts in the 90 deg ply first, which is in agreement with the experimental observation. Under the same loading condition, the stress in the 90 deg ply of the transverse specimen is greater than that of the longitudinal specimen. This trend explains whey the longitudinal specimen has a longer fatigue life than the transverse specimen, as observed in Part 1.

• Sponsoring Organization: USDOE
• OSTI ID: 205257
• Report Number(s): CONF-940204--
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 12 Vol. 26; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
COMPOSITE MATERIALS
CORRELATIONS
CRACKS
FATIGUE
FIBERS
FINITE ELEMENT METHOD
INTERFACES
LAYERS
MATHEMATICAL MODELS
PREDICTION EQUATIONS
SILICON CARBIDES
STRESS ANALYSIS
STRESSES
TITANIUM BASE ALLOYS
VANADIUM ALLOYS