Consider the following material called carbon-epoxy with a fiber volume fraction of 70% and Ef = 379 GPa, νf = 0.22, Em = 3.3 GPa, and νm = 0.35. Compute E1, E2, ν12, and G12 using both the rule of mixtures (ROM) and more accurate formulas recommended.
Consider the results and comment on which values are lower or upper bounds to the real value of each elastic property and what seems to be the best model in each case.