This research explores micromechanics modeling for the prediction of stiffness and strength properties of nanocomposites consisting of randomly oriented carbon nanotubes (CNTs) and an epoxy matrix, and multiscale composites consisting of unidirectional glass fibers, randomly orientated CNTs, and an epoxy matrix. For stiffness properties, including Young's modulus, Poisson's ratio, and shear modulus, of CNTs/epoxy composites and glass fiber/CNTs/epoxy composites, the Mori-Tanaka model and Halpin-Tsai equations were used. To obtain the strength properties of the composites, including tensile and compressive strength, several empirical equations were employed. The estimated mechanical properties of nanocomposites were used as matrix properties in the micromechanical models for multiscale composites. The results showed that the stiffness and strength properties of nanocomposites and multiscale composites were improved by integrating CNTs in the systems.

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