A dynamic crack-growth model using discrete, two-dimensional fiber bridges developed for ceramic composites containing nonlinear, creeping fibers in an elastic matrix is used to develop a crack growth mechanism map. In addition to nonlinear creep, fiber oxidation and fiber/matrix interphase oxidation are treated and discussed. The model aids in the development of a crack-growth mechanism map based on available experimental crack growth data as a function of temperature and oxygen concentration and in terms of proposed crack-growth mechanisms; fiber relaxation (FR), interface removal (IR), viscous sliding (VS), oxidation embrittlement (OE), and fiber stress rupture (SR). Transitions between the various mechanisms are identified and discussed.
Revised: January 17, 2011 |
Published: October 30, 2001
Citation
Henager C.H., C.A. Lewinsohn, E.P. Simonen, and R.H. Jones. 2001.Environmental Effects on Crack Growth in Continuous Fiber SiC-Composites. In IFC-10, The 10th International Congress on Fracture, December 6-10, Honolulu, Oahu, Hawaii (electronic media proceedings), ICF100962OR. Oxford:Elsevier Science Ltd.PNNL-SA-34705.