The knowledge of fiber behavior in CMCs is rather modest, and models tend to be based on concepts that are less than complete. The present paper addresses several aspects of this problem. Fundamental assumptions for tensile strength models are discussed, and some basic modeling approaches are described. The effects of fiber fracture on the quasi-static stress–strain behavior are described (from physical measurements), and some models of that behavior discussed. Finally, a summary of the “state of affairs” for this subject will be attempted, and the needs for further investigation, especially to support improved modeling, will be presented.

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