Method of Cells-Based Multiscale Modeling of Elastic Properties of Filament Wound C/C-SiC Including Free Si and Matrix Porosity

Publication date: Available online 13 July 2019Source: Journal of Materials Science & TechnologyAuthor(s): Evan J. Pineda, Marek Fassin, Stefanie Reese, Jaan-Willem SimonAbstractThree 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.
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research