Fatigue in Ceramic Matrix Composites

SiC‐Matrix Composites: Nonbrittle Ceramics for Thermo‐Structural Application

“…18 Finally, they are less fatigue-prone than metals and alloys with stress threshold below which no fatigue failure occurs, of the order of 75% the ultimate failure stress under static loading. 20 The tensile stress-strain behavior of SiC-matrix composites does not change markedly up to % 11001C. However, some change may be observed either at higher temperatures if the fibers are limited in thermal stability (case of the unstable Si-C-O fibers) or even at lower temperatures when an oxidizing atmosphere has access to the fibers and the interphase (case of insufficiently protected materials).…”

“…SiC‐matrix composites are tough when properly designed and fabricated with toughness, expressed in terms of critical energy release rate of the order of 10 kJ/m 2 , whereas that of monolithic SiC‐ceramics is of the order of a few 100 J/m 2 15 . Finally, they are less fatigue‐prone than metals and alloys with stress threshold below which no fatigue failure occurs, of the order of 75% the ultimate failure stress under static loading 20 …”

Fracture processes numerical modeling of elastic-brittle bodies with statistically distributed subregions strength values

“…Besides, the structural elements mechanical properties (most especially strength) statistical distribution over the body volume can also significantly affect the fracture process modeling results [23,[38][39][40][41][42][43][44][45][46][47]. This feature was widely discussed in problems of fibrous composites (consisting a large number of filaments with various strength properties [43,[46][47]) properties prediction [46,[48][49]. However, a small number of works investigate the damaging processes of elastic-brittle solids with stress concentrators taking into account the strength characteristics distribution, which may cause not only the load bearing capacity change, but the fracture mechanisms conversion.…”