Composite Modulus Calculator (Rule of Mixtures)
Longitudinal and transverse moduli of a fiber composite from constituents.
Along the fibers you get 60% of carbon's glory; across them, barely 3× the epoxy. That 20:1 anisotropy is why layup schedules exist — and why composites fail in the 'wrong' direction.
Formula
Composite Modulus Calculator (Rule of Mixtures) is a free rule of mixtures for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Composite Modulus Calculator (Rule of Mixtures)
Longitudinal and transverse moduli of a fiber composite from constituents. The calculation implements E₁ = E_f·V_f + E_m·(1−V_f); 1/E₂ = V_f/E_f + (1−V_f)/E_m (Composite micromechanics — Jones). Along the fibers you get 60% of carbon's glory; across them, barely 3× the epoxy. That 20:1 anisotropy is why layup schedules exist — and why composites fail in the 'wrong' direction.
How to use Composite Modulus Calculator (Rule of Mixtures)
- 1Enter Fiber modulus E_f in GPa (Carbon 230–290 · E-glass 72 · aramid 70–110).
- 2Enter Matrix modulus E_m in GPa (Epoxy 3–4).
- 3Enter Fiber volume fraction in %.
- 4Read Longitudinal E₁, Transverse E₂ instantly — no submit button needed.
Why use Composite Modulus Calculator (Rule of Mixtures)?
- ✓Implements the standard formula — E₁ = E_f·V_f + E_m·(1−V_f); 1/E₂ = V_f/E_f + (1−V_f)/E_m
- ✓Reference cited on-page: Composite micromechanics — Jones
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Composite Modulus Calculator (Rule of Mixtures) use?+
It computes E₁ = E_f·V_f + E_m·(1−V_f); 1/E₂ = V_f/E_f + (1−V_f)/E_m, per Composite micromechanics — Jones. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Along the fibers you get 60% of carbon's glory; across them, barely 3× the epoxy. That 20:1 anisotropy is why layup schedules exist — and why composites fail in the 'wrong' direction.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Composite Modulus Calculator (Rule of Mixtures) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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