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Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks

Hoffman, Markus ; Skirl, Siegfried ; Pompe, Waldemar ; Rödel, Jürgen :
Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks.
[Online-Edition: http://dx.doi.org/10.1016/S1359-6454(98)00367-X]
In: Acta Materialia, 47 (2) pp. 565-577. ISSN 1359-6454
[Artikel], (1999)

Offizielle URL: http://dx.doi.org/10.1016/S1359-6454(98)00367-X

Kurzbeschreibung (Abstract)

Thermal expansion data for Al2O3/Al interpenetrating network composites, obtained using a dilatometer, are analysed to determine the residual stress during, and after, thermal cycling between room temperature and 600 degrees C. A rigorous technique, using the effective medium approximation method, is applied, utilizing unconstrained thermal strains of the individual phases which are determined experimentally. Coefficients of thermal expansion are predicted as a function of metal content and temperature. Residual stresses are calculated using two approaches: (1) a "macroscopic" approach which considers total composite strain and (2) a "micromechanical" approach which considers time dependent effects in the metal phase. Predictions agree well with experimental data and neutron diffraction measurements, and provide a mechanistic understanding of the thermo-mechanical behaviour of the material. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

Typ des Eintrags: Artikel
Erschienen: 1999
Autor(en): Hoffman, Markus ; Skirl, Siegfried ; Pompe, Waldemar ; Rödel, Jürgen
Titel: Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks
Sprache: Englisch
Kurzbeschreibung (Abstract):

Thermal expansion data for Al2O3/Al interpenetrating network composites, obtained using a dilatometer, are analysed to determine the residual stress during, and after, thermal cycling between room temperature and 600 degrees C. A rigorous technique, using the effective medium approximation method, is applied, utilizing unconstrained thermal strains of the individual phases which are determined experimentally. Coefficients of thermal expansion are predicted as a function of metal content and temperature. Residual stresses are calculated using two approaches: (1) a "macroscopic" approach which considers total composite strain and (2) a "micromechanical" approach which considers time dependent effects in the metal phase. Predictions agree well with experimental data and neutron diffraction measurements, and provide a mechanistic understanding of the thermo-mechanical behaviour of the material. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Acta Materialia
Band: 47
(Heft-)Nummer: 2
Freie Schlagworte: CERAMICS; METALS; PARTICLES; STRENGTH; ALUMINA; CREEP
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
FB Materialwissenschaft (aufgegangen in FB11)
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 19 Nov 2008 15:58
Offizielle URL: http://dx.doi.org/10.1016/S1359-6454(98)00367-X
ID-Nummer: 10.1016/S1359-6454(98)00367-X
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