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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（12）
• 页码范围: 2906-2918
• 页数: 13页
• 语种: 英文

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.