0
RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Time-Dependent Crack Initiation and Growth in Ceramic Matrix Composites

[+] Author and Article Information
M. R. Begley

University of Connecticut, Storrs, CT 06268

B. N. Cox

Rockwell International, Thousand Oaks, CA 93017

R. M. McMeeking

University of California, Santa Barbara, Santa Barbara, CA 93107

J. Eng. Gas Turbines Power 120(4), 808-812 (Oct 01, 1998) (5 pages) doi:10.1115/1.2818472 History: Received March 15, 1997; Online November 19, 2007

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 that 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 © 1998 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In