Buckling and postbuckling of CNT-reinforced composite sandwich cylindrical panels subjected to axial compression in thermal environments

Abstract

An analytical investigation on the buckling and postbuckling behavior of carbon nanotube reinforced composite (CNTRC) sandwich cylindrical panels exposed to thermal environments and subjected to uniform axial compression is presented in this paper. Beside sandwich model with CNTRC face sheets in the literature, the present work suggests a sandwich model with CNTRC core layer and homogeneous face sheets. Carbon nanotubes (CNTs) are reinforced into matrix phase through uniform or functionally graded distributions. Effective properties of nanocomposite layers are determined according to extended rule of mixture. Formulations are based on the first order shear deformation theory taking into account Von Karman-Donnell nonlinearity. Approximate solutions are assumed to satisfy simply supported boundary conditions and Galerkin method is used to derive the closed-form expression of nonlinear load-deflection relation from which buckling loads and postbuckling paths are determined. Numerical examples are carried out and interesting remarks are given.

Thermal and thermomechanical buckling of CNT-reinforced composite sandwich cylindrical shells including elasticity of tangential edge restraint

“…In aforementioned works [25][26][27], sandwich structures are composed of isotropic homogeneous core layer and FG-CNTRC face sheets. Long and Tung [28][29][30] investigated the postbuckling behavior of sandwich plates and cylindrical panels with FG-CNTRC core layer and face sheets subjected to mechanical and thermal loads. Recently, Foroutan et al [31] used semianalytical approach to treat the nonlinear static and dynamic postbuckling responses of sandwich cylindrical panels with an FG-CNTRC core layer taking the hygrothermal and viscoelastic foundation effects into consideration.…”

Nonlinear response of doubly curved sandwich panels with CNT-reinforced composite core and elastically restrained edges subjected to external pressure in thermal environments

“…According to standard model of sandwich structure, core layer should be thicker and lighter, whereas face sheets should be thinner and stiffer. Towards this standard sandwich model, beside sandwich structure considered in above works [17][18][19][20][21][22][23], a new sandwich model with CNTRC core layer and homogeneous face sheets has been suggested in works of Long and Tung [24][25][26]. These works studied the postbuckling behaviors of sandwich rectangular plates and cylindrical panels with FG-CNTRC face sheets or core layer under compressive, thermal and thermomechanical loads.…”

“…Subsequently, Hieu and Tung [27] treated the linear buckling problem of sandwich cylindrical shells constructed from FG-CNTRC and homogeneous layers subjected to uniform temperature rise and external pressure. Previous studies [24][25][26][27] revealed that efficiencies of buckling resistance and load carrying in postbuckling region can be optimal when sandwich structures are made of thicker CNTRC core layer and thin homogeneous face sheets. Recently, Forountan et al [28] used a semi-analytical method for static and dynamic postbuckling analyses of sandwich cylindrical panels with an FG-CNTRC core resting on nonlinear viscoelastic foundations.…”