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Al-Al2O3 composites with interpenetrating network structures: Composite modulus estimation

: Moon, R.J.; Tilbrook, M.; Hoffmann, M.; Neubrand, A.


Journal of the American Ceramic Society 88 (2005), Nr.3, S.666-674
ISSN: 0002-7820
Fraunhofer IWM ()
Komposit; MMC; E-Modul; Mikromechanik; Steifigkeit

The effective Youngs´s modul of co-continuous Al-Al203 comosites over the 5-97 vol % Al203 composition range were experimentally measured and compared with theoretical composite modulus values predicted using the methods of Ravichandran, Tuchinskii, Hashin-Shtrikman, and the effective medium approximation (EMA). The influence of phase morphology an the modulus ratio (E1/E2) of the constituent phases on the resulting experimental and calculated Young´s modulus is discussed. For two-phased co-continuous composites with a modulus ratio greater than 5, the EMA, with an appropriate microstructural shape factor, was the most consistent method for approximating the composite Young´s modulus over the entire composition range.