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Micromechanics
Effective unidirectional lamina properties from fiber and matrix properties. E1 and ν12 via rule of mixtures; E2 and G12 via Halpin–Tsai (preferred) and inverse rule of mixtures (lower bound). Carbon and aramid fibers can be entered as transversely isotropic.
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Fiber
Carbon and aramid are far stiffer along the fiber than across it. Leaving E₂f blank treats the fiber as isotropic, which roughly doubles the predicted E₂ for carbon.