Materials 3(1), 434-451, 2010

AN INCREMENTAL MORI-TANAKA HOMOGENIZATION SCHEME FOR FINITE STRAIN THERMOELASTOPLASTICITY OF MMCs

H.E. Pettermann1, C.O. Huber2, M.H. Luxner2,3, S. Nogales1, H.J. Böhm1

1Institute of Lightweight Design and Structural Biomechanics,
TU Wien, Vienna, Austria
2Austrian Aeronautics Research Network
3Luxner Engiennering, Imst, Austria


Abstract - The present paper aims at computational simulations of particle reinforced Metal Matrix Composites as well as parts and specimens made thereof. An incremental Mori-Tanaka approach with isotropization of the matrix tangent operator is adopted. It is extended to account for large strains by means of co-rotational Cauchy stresses and logarithmic strains and is implemented into Finite Element Method software as constitutive material law. Periodic unit cell predictions in the finite strain regime are used to verify the analytical approach with respect to non-proportional loading scenarios and assumptions concerning finite strain localization. The response of parts made of Metal Matrix Composites is predicted by a multiscale approach based on these two micromechanical methods. Results for the mesoscopic stress and strain fields as well as the microfields are presented to demonstrate to capabilities of the developed methods.
(hjb,100113)