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Multiscale homogenization models for the elastic behaviour of metal/ceramic composites with lamellar domains

: Ziegler, T.; Neubrand, A.; Piat, R.

Preprint urn:nbn:de:0011-n-1332111 (1.2 MByte PDF)
MD5 Fingerprint: e5624bc07589c06e4b781de923a9452b
Erstellt am: 30.3.2012

Composites science and technology 70 (2010), Nr.4, S.664-670
ISSN: 0266-3538
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
metal-matrix composites; MMC; mechanical property; FEA; finite element analysis; modelling

This study predicts the elastic properties of an innovative metalceramic composite with statistically oriented domains of parallel ceramic platelets embedded in a eutectic AlSi-alloy. For this purpose, a twostep homogenization procedure was employed by finite element- and micromechanical modelling. In a first step, the microstructure of the specimen was divided in domains with the same orientation of lamellae and the elastic properties of single domains were calculated while a precise representation of the shape of the lamellae was attempted. In a second step the elastic constants of a large specimen consisting of many domains were computed both by finite element and micromechanical modelling. The experimental Youngs modulus of such poly-domain specimens was determined by an acoustic resonance method and was lower than predicted. The differences can be explained by microcracks caused by large residual microstresses produced in these materials when they are cooled from the manufacturing temperature.