STP1315: Damage, Fatigue, and Failure of Ceramic-Matrix Composites

    Burr, A
    Post-graduate researcher and research associate professor, Laboratoire de Mécanique et Technologie, ENS de Cachan/CNRS/Université Paris 6, Cachan,

    Hild, F
    Post-graduate researcher and research associate professor, Laboratoire de Mécanique et Technologie, ENS de Cachan/CNRS/Université Paris 6, Cachan,

    Leckie, FA
    Professor, College of Engineering, University of California, Santa Barbara, CA

    Pages: 14    Published: Jan 1997


    Abstract

    Matrix cracking, interfacial debonding and sliding, fiber breakage and fiber pullout induced loss of stiffness, inelastic strains, hysteresis loops, and crack closure. These mechanisms are analyzed within the framework of continuum mechanics through the introduction of internal variables. Two models that are faithful to the micromechanical analysis are studied. They provide guidance on the choice of the relevant internal variables to describe the mechanical behavior of unidirectional fiber-reinforced composites. Ultimate strength properties of fiber-reinforced composites are derived and compared with results related to localization. Extensions to cyclic load histories are discussed in terms of ultimate strength reached after cycling.

    Keywords:

    matrix cracking, debonding, fiber breakage, interfacial shear strength, interfacial wear, ultimate strength, continuum damage mechanics, state potential, internal variables, fatigue failure maps, fatigue (materials), fracture (materials)


    Paper ID: STP11878S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP11878S


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