Spearing, S. Mark, Zok, Frank W. and Evans, Anthony G.
Stress corrosion and fatigue cracking in a unidirectional ceramic Matrix composite.
Journal of the American Ceramic Society, 77, (2), . (doi:10.1111/j.1151-2916.1994.tb07030.x).
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A study of matrix cracking in a unidirectional ceramic-matrix composite under static loading conditions has been conducted. The evolution of crack density with time has been measured using both flexure and uniaxial tension tests. Subcritical cracking has been observed at stresses below that required to develop matrix cracks in short-duration, monotonic loading tests. Furthermore, a relatively high final crack density has been observed following extended periods (~106 s) under static load. A fracture mechanics analysis applicable to subcritical crack growth has been developed and used successfully to model the evolution of matrix cracking with time and applied stress. The model incorporates the properties of the matrix, fibers, and interfaces, as well as the residual stress and the initial flaw distribution in the matrix.
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