Crack bridging by SiC fibers during slow crack growth and the resultant fracture toughness of SiC/SiC{sub f} composites

Journal Article · Thu Dec 14 23:00:00 EST 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00461-4· OSTI ID:136960

Jones, C R ^[1]; Henager, Jr, C H; Jones, R H ^[2]

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1. Associated Western Universities, Richland, WA (United States)
2. Pacific Northwest Lab., Richland, WA (United States)

Ceramic matrix composites (CMCs) offer the possibility of high-strength, corrosion-resistant, high-temperature materials with a fracture resistance adequate for use as structural materials in a variety of systems. Reinforcement of a brittle ceramic matrix material by brittle fibers or whiskers separated from the matrix by a weak interface contributes to fracture resistance through reinforcement pull-out, crack bridging, crack deflection, and matrix micro-cracking. This paper explores the effect of the bridging on resultant toughness after SCG by comparing the toughness of samples, shown by K{sub Q} (peak load fracture toughness) and maximum load, with cracks of varying lengths produced by machined notches (no bridging) and SCG (bridged).

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 136960
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 12 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CRACK PROPAGATION
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
SILICON CARBIDES