Chapter V. Concluding Remarks
5.2 Future works
In the future, in order to enhance the connectivity and unification of the research topics presented here, by tracing the fabrication and application of one specific composite, the effects of porosity, density deviation and so on can be studied. For Cf/C composite as an example, after the porosity and density distributions of a product are predicted through the CVI process analysis, it is possible to implement the distributions to composite tow geometry to predict material property or to microstructure to analyze fracture behavior.
Additional research can be performed for in-depth analysis at each step. For the CVI process analysis in Chapter II, chemical reaction constructing another type of a matrix material such as SiC can be added. The SiC matrix utilizes methyl trichlorosilane (MTS) as a precursor, and, because this substance is directly deposited to fiber surface through a simple chemical reaction, the process is easier to model than that for a carbon matrix material. In addition, it is possible to characterize CMC including coating layers. When different matrix precursors are sequentially applied to the CVI process through multiple steps, the preform growth at each step can be traced. Because the presented research demonstrates the effectiveness of the chemo-physical model for the CVI process to manufacture Cf/C composite, if the model is extended to other materials and structures of CMC, manufacturer will be able to make better use of it.
Although the model presented in Chapter III is capable of characterizing heat transfer, stress distribution, thermal expansion and so on, its application is limited to the prediction of material properties. By applying the load (high-temperature thermal shock or mechanical loading) that a real composite product experiences to the RVE model, internal stress distributions and critical locations can be examined. Moreover, when fracture mechanics is implemented, the propagation behavior of damage and failure initiated from the critical locations can be analyzed. Furthermore, because this analysis
approach can include the effect of defects such as a pore and so on, when a composite product is designed, its minimal requirement and allowable load level satisfying structural integrity can be effectively determined.
In Chapter IV, although various S-S curves can be obtained by observing the microstructure fracture, only qualitative analysis is carried out for its strength and toughness. Identification of a statistic parameter such as a distance between fibers would be useful for quantitative analysis. In addition, because the algorithm is automated to construct a microstructure RVE, it is possible to statistically extract strength and toughness after constructing multitude of RVEs. If they are used for the fracture properties of the fiber tow, they will be directly utilized to analyze damage in the composite.
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