We consider the propagation of time-harmonic torsional waves in composite bi-material elastic cylinders. The interface between the core and the surrounding cladding is assumed to be imperfect: the tractions are continuous across the interface but the displacement jump is proportional to the stress acting on the interface. For torsional waves, this requires the introduction of a single constant ...

This article presents the analysis of functionally graded thick hollow cylinders under dynamic load. The functionally graded cylinder is assumed to be made of many subcylinders. Each subcylinder is considered as an isotropic layer. Material’s properties in each layer are constant and functionally graded properties are resulted by suitable arrangement of layers in multilayer cylinder. The proper...

0927-0256/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.commatsci.2009.12.007 * Corresponding author. Tel.: +1 540 231 6051; fax E-mail address: [email protected] (R.C. Batra). Free vibrations of thirty-three armchair, zigzag and chiral single-walled carbon nanotubes (SWCNTs) of aspect ratios (length/diameter) between 3 and 15 and having free ends have been studied using the MM3 potential. ...

A curved spiral antenna above a finite hollow conducting cylinder is analyzed using the method of moments. The effects of cylinder length 2H and cylinder radius rcy on the radiation characteristics of the spiral are evaluated. As 2H increases, the cross-polarization component of the radiation field in the broadside direction decreases to a constant value (approximately 18 dB). When 2H is greate...

Free vibrations of zigzag single-wall carbon nanotubes SWCNTs of aspect ratio length/diameter 6 and with ends traction-free have been studied using molecular mechanics MM simulations with the MM3 potential. It is found that the frequencies of inextensional the Love and the Rayleigh modes of an n, 0 SWCNT saturate at the circumferential wave number of either n−1 /2 or n /2 where n is odd or even...

We postulate that an equivalent continuum structure (ECS) of a single-walled carbon nanotube (SWCNT) is a hollow cylinder with mean radius and length equal to that of the SWCNT, and find the thickness of the ECS so that its mechanical response in free vibrations is the same as that of the SWCNT. That is, for mechanical deformations, the ECS is energetically equivalent to the SWCNT. We use MM3 p...