Composites, Fiberglass & Advanced Materials worked example

Fiber Volume Fraction with fiber volume in the cured laminate of 0.28 cu in: a worked example in composites, fiberglass & advanced materials

This worked example runs the fiber volume fraction numbers for a tougher week than the baseline: fiber volume in the cured laminate of 0.28 cu in instead of the typical 0.56 cu in. Estimate fiber volume fraction from fiber volume and total composite volume.

The inputs for this scenario

  • Fiber volume in the cured laminate: 0.28 cu in (the input this scenario stresses; the baseline uses 0.56)
  • Total cured laminate volume: 1 cu in (held at the documented default)
  • Percent reporting conversion: 100 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Fiber Volume Fraction = fiber volume in the laminate รท total cured laminate volume.
  • fiber volume fraction works out to 28 x at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 0.28 value at these inputs.
  • Conversion factor works out to 100 x at these inputs.
  • total cured laminate volume works out to 1 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where fiber volume in the cured laminate sits at 0.56 cu in and the headline result is 56 x, this scenario comes in 50% below the baseline at 28 x.
  • Use it after cure or burn-off/acid-digestion testing to verify a laminate hit its target Vf, or during design to back out the resin volume needed for a target fraction. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • fiber volume fraction: 28 x (headline result)
  • Raw ratio: 0.28 value
  • Conversion factor: 100 x
  • total cured laminate volume: 1 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Fiber Volume Fraction calculator, set fiber volume in the cured laminate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.