A composite containing fibres long enough to transfer load effectively through the matrix. Continuous aligned fibres under axial loading approximately share strain with a well-bonded matrix.
The fraction of composite volume occupied by reinforcing fibres; physically achievable values depend on fibre geometry, packing, matrix infiltration and voids.
A composite containing two or more reinforcing fibre types. In the ideal longitudinal model its axial modulus is the volume-fraction-weighted sum of constituent moduli.
For continuous, parallel, perfectly bonded fibres and uniform axial strain, . This idealization is the axial Voigt elastic approximation; voids, fibre waviness and poor load transfer reduce stiffness.

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