Ceramic cyclic fatigue crack propagation

M. J. Reece, F. Guiu, and M. F. R. Sammur, Cyclic Fatigue Crack Propagation in Alumina under Direct Tension-Compression Loading, J. Am. Ceram. Soc., 72[2], 348-352 (1990). 

Dauskardt, R.K., Yu, W., and Ritchie, R.O. (1997) Mechanism of cyclic fatigue crack propagation in a flne grained alumina ceramic the role of crack closure. Fatigue Fract. Eng. Mater. Struct., 20, 1453-1466. 

Cyclic crack-growth experiments were performed in SiC whisker-reinforced Al203-SiC ceramic composites. The fatigue-crack propagation rate, da/dN, of long cracks (in excess of 3 mm) has indicated a power law-dependent function of the applied-stress intensity according to the Paris Law Eq. (7.9). The values of C and... 

Figure 12.12 Cyclic fatigue long-crack propagation data for several ceramics compared to those for some typical metals.TZPs are tetragonal zirconia polycrystals (see Chap. 11).

A typical fracture surface of fibers with a mirror and hackle feature in SiC/SiC ceramics is shown in Fig. 7.24. The cyclic softening observed in SiC/SiC occurs either under stress control or strain control. Since this observation is crack initiation- and propagation-related, it is possible that similar phenomena may be more frequent after softening during fatigue deformation. The Manson-Coffin... 

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