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

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

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.

Item Type: Article
Erschienen: 1999
Creators: Hoffman, Markus and Skirl, Siegfried and Pompe, Waldemar and Rödel, Jürgen
Title: Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks
Language: English
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.

Journal or Publication Title: Acta Materialia
Volume: 47
Number: 2
Uncontrolled Keywords: CERAMICS; METALS; PARTICLES; STRENGTH; ALUMINA; CREEP
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften)
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Nov 2008 15:58
Official URL: http://dx.doi.org/10.1016/S1359-6454(98)00367-X
Identification Number: doi:10.1016/S1359-6454(98)00367-X
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