because ideal bonding between fiber/matrix interface, perfect alignment of fibers and absence of voids and other defects are considered in the last. For the FML composites there is an additional factor related to the influence of surface treatment on the aluminum foil, which is not considered also in the theoretical calculations. The result of the elastic modulus for the aluminum 2024 alloy, Table 7, shows a good agreement between the value found in the literature and the experimental value