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1. The following data has been obtained experimentally for a composite based on an unidirectional carbon-epoxy prepreg (MR50 carbon fiber at 63% by volume in LTM25 epoxy). Determine if the restrictions on elastic constants are satisfied.

E₁ = 156.403 GPa, E₂= 7.786 GPa
v₁₂ = 0.352, v21 = 0.016
G₁₂= 3.762 GPa

2. Select a matrix, fiber, and fiber volume fraction to obtain a material with E₁> 30 GP a, E₁/E₂ « 3.5.

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