EFFECTS OF NORMAL STRESS AND NORMAL STRAIN ON THE FUNDAMENTAL FREQUENCIES OF FREE VIBRATIONS OF COMPOSITE LAMINATED PLATES

A new displacement model of free vibrations,including effects of normal stress, normal strain and transverse shear deformation,is developed in this paper.The new model solutions are compared with the YNS theory solutions using Rayleigh-Ritz method for free vibrations,and the effects of transverse normal stress and normal strain on the fundamental frequencies of free vibrations of composite laminated plates with simply-supported edges are obtained.