**2.2 Carbon nanotube reinforced composite's stress transfer**

The improvement [4] in mechanical properties of hybrid composite system strongly depends on interfacial mechanical properties (interfacial stress transfer efficiency). The interfaces are zones of structural, compositional and property gradients. The width varies from single atom to micrometers. The properties of the composite depend on the surface of the single fiber and the resin used for bonding. The stress transfer of SWNT reinforced composite was studied using hybrid FEM approach. Three dimensional REV (representative elementary volume method) had been used along with Molecular Dynamics (MD) to exploit the stress transfer mechanism of CNT reinforced composite. The [4] effects of fiber volume fraction, interfacial stiffness and elastic modulus on the stress of the matrix were explored. The analytical models are difficult along with experiments in nanoscale as they are too expensive. Hence FEM simulated models were used to predict the stress transfer and found to be accurate on validation.
