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- W201214989 abstract "Cyclic fatigue-crack propagation behavior is studied in transformation-toughened Mg-PSZ monolithic ceramics (fracture toughnesses Kc between 2.9 and 16 MPa√m) and a SiC-whisker reinforced alumina composite (Kc ˜ 4.5 MPa√m). Stress/life (S/N) data in Mg-PSZ, derived from unnotched cantilever-bend specimens, show markedly lower lives under tension-compression compared to tension-tension loading; similar to metals, “fatigue limits” approach 50% of the tensile strength of the material. Crack-growth results, based on studies on “long” (>3 mm) cracks in compact-tension specimens, show fatigue-crack growth rates in both systems to be markedly power-law dependent on the stress-intensity range, ΔK, with a threshold stress-intensity range, ΔKTH, of the order of <50% of Kc. Conversely, for “small” (<250 μm) surface cracks, fatigue-crack growth is seen to occur at ΔK levels some 2 to 3 times smaller than the long-crack threshold, ΔKTH. Possible mechanisms of ceramic fatigue and the implications for safety-critical design criteria are discussed." @default.
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- W201214989 date "1992-01-01" @default.
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- W201214989 title "CYCLIC FATIGUE-CRACK PROPAGATION IN CERAMICS AND CERAMIC COMPOSITES" @default.
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- W201214989 doi "https://doi.org/10.1016/b978-0-08-037890-9.50170-8" @default.
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