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Time Dependent Crack Initiation and Growth in Ceramic Matrix Composites FREE

[+] Author Affiliations
Matthew R. Begley

Harvard University, Cambridge, MA

Brian N. Cox

Rockwell International, Thousand Oaks, CA

Robert M. McMeeking

University of California, Santa Barbara, Santa Barbara, CA

Paper No. 97-GT-275, pp. V004T14A051; 11 pages
doi:10.1115/97-GT-275
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

Matrix cracking in ceramic matrix composites with fine grained fibers at high temperatures will be governed by fiber creep, as relaxation of the fibers eliminates crack tip shielding. Using a time dependent bridging law which describes the effect of creeping fibers bridging a crack in an elastic matrix, crack growth initiation and history have been modeled. For a stationary crack, crack tip stress intensity factors as a function of time are presented to predict incubation times before subcritical crack growth. Two crack growth studies are reviewed: a constant velocity approximation for small-scale bridging, and a complete velocity history analysis which can be used to predict crack length as a function of time. The predictions are summarized and discussed in terms of identifying various regimes of crack growth initiation, subcritical growth, and catastrophic matrix cracking.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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