The mechanical behavior of a fiber-reinforced brittle-matrix composite

Thesis/Dissertation · Thu Dec 31 23:00:00 EST 1987

OSTI ID:7197884

Luh, E Y

Ceramics and ceramic-containing composites are being studied to fulfill requirements for high strength and toughness at elevated temperatures in corrosive atmospheres. In this thesis, mechanical properties are examined for a model ceramic-fiber, ceramic-matrix system. An overview of the micromechanics of composite fracture is presented by examining the influence of various parameters on fracture toughness. Included in this discussion are several approaches to the analysis of fiber bridging as a contribution to composite toughening. Next, an experimental study of fracture trends is conducted by systematically changing interfacial properties by heat treatment. To fully consider toughening contributions made by fiber bridging and pull-out, a statistical analysis of pull-out lengths is incorporated into existing formulations. Effects of heat treatment on interfacial properties are considered photomicrographically determine physical changes that influence mechanical behavior. The role of subcritical crack growth is examined by cyclic fatigue testing to determine effects in the small-crack regime. Finally, conclusions are drawn regarding the role of the fiber-matrix interface in toughness trends and cyclic-fatigue behavior.

• Research Organization: California Univ., Berkeley, CA (USA)
• OSTI ID: 7197884
• Country of Publication: United States
• Language: English

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