Second—order effects on the wave propagation in elastic, isotropic, incompressible, and homogeneous media

In this paper we propose a perturbation method to investigate the propagation of the ordinary waves in second–order elastic, isotropic, incompressible, and homogeneous materials. This method allows us to determine the first–order terms of the speeds and the amplitudes both of the principal waves and the waves in any propagation direction, when the undisturbed region is subjected to an arbitrary isochoric deformation. Another application of this method is presented when the undisturbed region is subjected to a simple shear. Finally, some numerical results are presented in Mooney–Rivlin materials.