Time-dependent crack initiation and growth in ceramic matrix composites

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2818472· OSTI ID:316150

Begley, M R ^[1]; Cox, B N ^[2]; McMeeking, R M ^[3]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Rockwell International, Thousand Oaks, CA (United States)
3. Univ. of California, Santa Barbara, CA (United States)

Matrix cracking in ceramic matrix composites with fine grained fibers at high temperatures will be governed by fiber creep, as relaxation of the fibers eliminates crack tip shielding. Using a time dependent bridging law that describes the effect of creeping fibers bridging a crack in an elastic matrix, crack growth initiation and history have been modeled. For a stationary crack, crack tip stress intensity factors as a function of time are presented to predict incubation times before subcritical crack growth. Two crack growth studies are reviewed: a constant velocity approximation for small-scale bridging, and a complete velocity history analysis which can be used to predict crack length as a function of time. The predictions are summarized and discussed in terms of identifying various regimes of crack growth initiation, subcritical growth, and catastrophic matrix cracking.

• Sponsoring Organization: USDOE
• OSTI ID: 316150
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 4 Vol. 120; ISSN 0742-4795; ISSN JETPEZ
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
CERAMICS
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
MATRICES