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Static fatigue failure in ceramics is often assumed to be due to one mechanism: slow crack growth from preexisting flaws. Multiple mechanisms of failure may be operative, however. Stress rupture data for two materials, hot-pressed silicon nitride and sintered silicon carbide, will be presented and interpreted in terms of multiple mechanisms.
static fatigue, ceramics, crack growth, strength, materials fracture, delayed failure, stress rupture, creep fracture, structural reliability, brittle materials
Ceramic engineer, U.S. Army Materials and Mechanics Research Center, Watertown, Mass.