Complete determination of elastic moduli of interpenetrating metal/ceramic composites using ultrasonic techniques and micromechanical modelling

► Stiffness matrices of interpenetrating metal/ceramic composites were determined. ► Two complementary ultrasonic spectroscopic techniques were used and the results were compared with micromechanical modelling. ► Consistent, reproducible and theoretically valid results were obtained. The complete st...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011, Vol.528 (28), p.8226-8235
Main Authors: Roy, Siddhartha, Gebert, Jörg-Martin, Stasiuk, Galyna, Piat, Romana, Weidenmann, Kay André, Wanner, Alexander
Format: Article
Language:English
Subjects:
Applied sciences
Ceramics
Elastic anisotropy
Elastic constants
Elasticity. Plasticity
Exact sciences and technology
Fibers
Fibres
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metal matrix composites (MMC)
Metals. Metallurgy
Micromechanics
Modelling
Preforms
Resonant ultrasound spectroscopy
Spectroscopy
Ultrasound
Ultrasound phase spectroscopy
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Summary:► Stiffness matrices of interpenetrating metal/ceramic composites were determined. ► Two complementary ultrasonic spectroscopic techniques were used and the results were compared with micromechanical modelling. ► Consistent, reproducible and theoretically valid results were obtained. The complete stiffness matrices of several metal/ceramic composites were analysed using the complementary ultrasonic spectroscopic techniques ultrasound phase spectroscopy (UPS) and resonant ultrasound spectroscopy (RUS). Three different aluminum/alumina composites having complex interpenetrating architectures were studied: a composite based on freeze-cast ceramic preform, a composite based on open porous ceramic preform obtained by pyrolysis of cellulose fibres, and a composite based on discontinuous fibre preform. Six of the nine independent elastic constants describing orthotropic elastic anisotropy were pre-determined by ultrasound phase spectroscopy and used as initial guess input for resonant ultrasound spectroscopy analysis, making the final results of all nine elastic constants more reliable. In all cases, consistent and reproducible results are obtained. Finally the experimental results were compared with effective elastic constants calculated using micromechanical modelling and a good correspondence between both is obtained.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2011.07.029