Eur.J.Mech. A/Solids 16, 79-102, 1997

ELASTIC STRESS FLUCTUATIONS IN RANDOM STRUCTURE PARTICULATE COMPOSITES

V.A. Buryachenko and F.G. Rammerstorfer

Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - We consider a linear elastic composite medium, which consists of a homogeneous matrix containing a homogeneous and statistically uniform random set of ellipsoidal inclusions. All components of the statistical second moment tensor of the stress fields, averaged over the volume of the components, are obtained. The micromechanical approach is based on the Green function technique as well as on the "multiparticle effective field" method (MEFM), previously proposed for estimating stress field averages in the components. The application of the theory is demonstrated by the construction of overall yield surfaces of composite materials. For the particular case of porous isotropic materials the comparison of results obtained by the proposed method with other ones is shown.


(hjb,970204)