fiber volume fraction

Fiber volume fraction is a measure of how much of a composite material's total volume is made up of fibers, like carbon or glass, compared to the resin or matrix holding them together. It’s expressed as a percentage. For example, a fiber volume fraction of 60% means 60% of the material's volume is fibers, which strengthens the composite. Higher fiber volume generally results in stronger, stiffer materials, but too high can make processing difficult. This ratio is important because it influences the mechanical properties and performance of fiber-reinforced composites.