A MODEL FOR CREEP RUPTURE IN CERAMIC MATRIX COMPOSITES

R. M. McMeeking  M. R. Begley  B. N. Cox      

Anales de la Mecánica de la Fractura, nº 13 . 1996 . Pág. 30 -38
Ver (.pdf): Anales13-004

Resumen: A model for crack growth in ceramic matrix composites with creeping fibers has been developed using a time dependent bridging law to account for the effect of fibers bridging a matrix crack. Time dependent crack growth was predicted when the matrix crack growth occurs at a critical stress intensity factor at the matrix crack tip. Crack growth rates are presented as a function of crack length and time. After the crack has grown completely across a laminate, life is controlled by the time to rupture exposed creeping fibers. A transition is expected from life dominated by matrix crack growth at low stress to life dominated by fiber creep rupture after crack growth at higher stress.

LocalizaciónLuso, Portugal

Mechanical and Environmental Engineering Department. University of California, Santa Barbara, California 93106, U. S. A
Division of Applied Sciences, Harvard University. Cambridge, Massachusetts 02138, U. S. A.
Rockwell Science Center, 1049 Camino Dos Rios, Thousand Oaks, California 91360, U. S. A.