This paper is concerned with the buckling of double-walled carbon nanotubes (DWCNTs) under axial load. The DWCNTs are modelled as two cylindrical shells, one shell nested in the other and Winkler springs are introduced to connect them in order to simulate the van der Waals forces between the two nanotubes. By using the Donnell thin shell theory, we derive the governing equations for the bucklin...

Cylindrical shells exhibit a dense frequency spectrum, especially in the lowest frequency range. In addition, due to the circumferential symmetry, frequencies occur in pairs. So, in the vicinity of the lowest natural frequencies, several equal or nearly equal frequencies may occur, leading to multiple internal resonances. The aim of the present work is to investigate the dynamic behavior and st...

Jeffrey N. Katz, M.D., Robert H. Brophy, M.D., Christine E. Chaisson, M.P.H., Leigh de Chaves, P.T., O.C.S., Brian J. Cole, M.D., M.B.A., Diane L. Dahm, M.D., Laurel A. Donnell-Fink, M.P.H., Ali Guermazi, M.D., Ph.D., Amanda K. Haas, M.A., Morgan H. Jones, M.D., M.P.H., Bruce A. Levy, M.D., Lisa A. Mandl, M.D., M.P.H., Scott D. Martin, M.D., Robert G. Marx, M.D., Anthony Miniaci, M.D., Matthew ...

An analytical investigation on the nonlinear response of doubly curved panels constructed from homogeneous face sheets and carbon nanotube reinforced composite (CNTRC) core subjected to external pressure in thermal environments is presented this paper. Carbon nanotubes (CNTs) are into layer through uniform or functionally graded distributions. The properties constituents assumed be temperature ...

carbon nanotube is investigated based on an elastic multi-layer shell model with van der Waals interaction taken into consideration. The multi-walled carbon nanotube is described as an individual elastic shell and the interlayer friction is negligible between the inner and outer tubes in the proposed model. And the Donnell equations of cylindrical shells are employed to describe the nonlinear b...

The clinical syndrome of galactosaemia is now well known and more than 40 cases have been carefully described in the literature (Bell, Lindsay and Watson, 1950; Bray, Isaac and Watkins, -1952; Donnell and Lann, 1951; Darling and Mortensen, 1954; Goldbloom and Brickman, 1946; Goldstein and Ennis, 1948; Goppert, 1917; Greenman and Rathbun, 1948; Hudson, Ireland, Ockenden and White-Jones, 1954; Jo...

This study deals with the vibrational behavior of two joined cross-ply laminated conical shells. Natural frequencies and mode shapes are investigated. Joined conical shells can be considered as a general case for joined cylindrical-conical shells, joined cylinderplates or cone-plates, cylindrical and conical shells with stepped thicknesses and also annular plates. Governing equations are obtain...

In this article, a nonlinear dynamical investigation of porose functionally graded cylindrical panels using proposed analytical model is carried out. The material's properties are considered to be porosity-dependent and in the thickness direction, corresponding power-law distribution. classical shell theory, with geometrical shape von Karman–Donnell, employed get Lagrange motion equations. By a...

Coombs, Donnell, and Kirk (1978. Journal of Experimental Psychology, 4, 497-512), in a study of risk preferences, collected data using both pick 1 and reject $ response modes. Although the preference orders derived from the two response modes were identical, the pick data contained a greater number of inconsistencies than the reject data. In the present study, predictions were derived from unfo...