Lifetime of ceramic-matrix composites under stress rupture loading with constant and stochastic loading stress

In this chapter, synergistic effects of stochastic loading stress and time interval on the stress rupture damage evolution and a lifetime of fiber-reinforced ceramic-matrix composites (CMCs) at intermediate temperatures were investigated. Relationships between the stochastic loading stress and stochastic time interval, internal damage evolution, macro strain, broken fibers’ fraction, and stress rupture lifetime of fiber-reinforced CMCs were established. The effects of the stochastic loading stress and stochastic time interval, constituent properties, damage condition, and environment temperature on the stress rupture time, strain evolution, and internal damage of SiC/SiC composite under stress rupture loading were discussed. Experimental stress rupture behavior of SiC/SiC composite under constant and stochastic loading conditions was predicted.