Interfacial debonding versus fiber fracture in fiber-reinforced ceramic composites

Conference · Sun Nov 01 04:00:00 EST 1998

OSTI ID:290939

Hsueh, C H; Becher, P F ^[1]; He, M Y ^[2]

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1. Oak Ridge National Lab., Metals and Ceramics Div., TN (United States)
2. Univ. of California, Santa Barbara, CA (United States). Materials Dept.

Toughening of fiber-reinforced ceramic composites by fiber pullout relies on debonding at the fiber/matrix interface prior to fiber fracture when composites are subjected to tensile loading. The criterion of interfacial debonding versus crack penetration has been analyzed for two semi-infinite elastic plates bonded at their interface. When a crack reaches the interface, the crack either deflects along the interface or penetrates into the next layer depending upon the ratio of the energy release rate for debonding versus that for crack penetration. This criterion has been used extensively to predict interfacial debonding versus fiber fracture for a crack propagating in a fiber-reinforced ceramic composite. Two modifications were considered in the present study to address the debonding/fracture problem. First, the authors derived the analysis for a strip of fiber, which had a finite width and was sandwiched between two semi-infinite plates of matrix. It was found that the criterion of interfacial debonding versus fiber fracture depended on the fiber width. Second, a bridging fiber behind the crack tip was considered where the crack tip initially circumvented the fiber. Subsequent to this, either the interface debonded or the fiber fractured. In this case, the authors have considered a bridging-fiber geometry to establish a new criterion.

• Research Organization: Oak Ridge National Lab., Metals and Ceramics Div., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 290939
• Report Number(s): ORNL/CP--99522; CONF-981059--; ON: DE99000233
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BONDING
CERAMICS
COMPOSITE MATERIALS
CRACK PROPAGATION
FIBERS
FRACTURE PROPERTIES
INTERFACES
MATHEMATICAL MODELS