Molecular dynamics (MD) simulations of nanoindentation using the hard sphere potential were carried out for Ti, Al and Ti/Al bilayer thin films with interaction of BCC and FCC single-crystal [1]. Fixed boundary conditions were used and the repulsive radial potential was employed for modeling the interaction between the tip and sample surface. Mechanical properties of the material at 300 K were obtained for Ti and Al thin films and Ti/Al bilayers [2]. Hardness and elastic parameters were determined from the load-unload curves obtained by means of the simulations. These results show a better mechanical response in the case of bilayers compared to the monolayers.