Several failure mechanisms, dictated by environmental conditions, temperature, interphase thickness, etc. exist in continuous fiber-reinforced ceramic matrix composites containing interphases that are susceptible to oxidation. Experimental techniques have been used to identify these mechanisms and conditions under which they occur. Details of the mechanical state of fibers that bridge matrix cracks, during the operation of each mechanism, are required to allow the application of models that can predict time-dependent, subcritical crack growth. This presentation will review the mechanisms of environmentally induced failure and discuss a simple method, using the compliance of individual fibers, for describing the stress state of fibers that bridge matrix cracks.
Revised: September 7, 2011 |
Published: October 25, 2000
Citation
Lewinsohn C.A., C.H. Henager, and R.H. Jones. 2000.Time-dependent crack growth in ceramic composites: from single fibers to bridged cracks. In 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures. A. Jan 23-Jan 28 2000, Cocoa Beach, FL, USA. In
Ceramic Engineering and Science Proceedings, 21, 415-422. Westerville, Ohio:American Ceramic Society. PNNL-SA-32532.