1722 R H. Jones, C.H. Henager J: /Journal of the European Ceramic Sociery 25(2005)1717-1722 mechanism map is helping us develop and understand crack 18. Zhu, Y. T, Taylor, S. T, Stout, M.G., Butt, D. P and Lowe, T growth mechanisms and to design improved composite ma C, Kinetics of thermal, passive oxidation of Nicalon fibers.J.4m. Ceram soc.,1998,81,655 19. DiCarlo, J. A, Yun, H. M, Morscher, G. N. and Goldsby, J. C. perature ceramic-matrix composites ll. Cera. Trans., 1995, 58 20. Glime, w. H. and Cawley, J. D, Stress concentration due to This research was supported by Basic Energy Sciences fiber-matrix fusion in ceramic.ms mposites. Am Ceram Soc. United States Department of Energy, under Contract no DE 998,81,2597 ACo6-76RLO 1830 with Pacific Northwest National Labo- 21. 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M, Creep crack crack growth in the creep behavior of growth with small scale bridging in ceramic matrix composites. Acta Idv Compos. Mater, 1999, 8, 77 Metall. Mater:. 1997. 45. 2897 36. Zhu, S, Mizuno, M, Kagawa, Y 14. Cox, B N, Marshall, D. B, McMeeking, R. M. and Begley, M.R., H, Creep and fatigue behavior in Hi-Nicalon-fiber-reinforced silicon Matrix cracking in ceramic matrix composites with fiber creep. Solid arbide composites at high temperatures. J. m. Ceram. Soc., 1999. Mech.4ppl.4ppl.,1997,49,353 15. Henager Jr, C. H. and Hoagland, R. G, Subcritical crack growth in 37. Tressler, R. E, Rugg, K. L, Bakis, C. E. and Lamon, J, Effects of CVI SiCf/SIC composites at elevated temperatures: Dynamic crack matrix cracking on the creep of Sic-SiC microcomposites. Key Eng wth model. Acta Materialia. 2001 Mater,1999,164/165,297 16. DiCarlo. J. A or high- 38. Evans, A G, Zok, F W, McMeeking, R. M. and Du, Z. Z, Models of mperature fiber reinforcements. 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