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Hybrid fibre composite Created 2026-10-20 Updated 2026-11-05

A hybrid fibre composite contains two or more types of reinforcing fibre in a common composite matrix. Combining carbon fibres and glass fibres, for example, provides another design choice besides changing the amount or orientation of a single reinforcement. The word hybrid specifies the combination of reinforcements, not a guarantee that every mechanical property improves.

For continuous, parallel fibres, perfect bonding and elastic axial loading, equal strain gives the extension of the longitudinal rule of mixtures

E_{L} = V_{1} E_{1} + V_{2} E_{2} + V_{m} E_{m}, V_{1} + V_{2} + V_{m} = 1.

Here the

V_{i}

are constituent fractions by volume and the

E_{i}

are axial Young's moduli. This estimate describes the initial elastic response. It does not by itself predict tensile strength: when one fibre population breaks, its load is redistributed through the composite matrix, changing the stress carried by the surviving population.