Method of cells-based multiscale modeling of elastic properties of filament wound C/C-SiC including free Si and matrix porosity

Evan J.Pineda¹，Marek Fassin²，Stefanie Reese²，Jaan-Willem Simon²

1. NASA Glenn Research Center2. Institute for Applied Mechanics, RWTH Aachen University

摘 要：Three different multiscale models, based on the method of cells（generalized and high fidelity） micromechanics models were developed and used to predict the elastic properties of C/C-SiC composites. In particular, the following multiscale modeling strategies were employed: Concurrent modeling of all phases using the generalized method of cells, synergistic（two-way coupling in space） multiscale modeling with the generalized method of cells, and hierarchical（one-way coupling in space） multiscale modeling with the high fidelity generalized method of cells. The three models are validated against data from a hierarchical multiscale finite element model in the literature for a repeating unit cell of C/C-SiC.Furthermore, the multiscale models are used in conjunction with classical lamination theory to predict the stiffness of C/C-SiC plates manufactured via a wet filament winding and liquid silicon infiltration process recently developed by the German Aerospace Institute. Finally, un-reacted Si（or free Si） and porosity in the C matrix are included in the multiscale model, and the effect of these new phases on the stiffness and local stresses are considered.

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