Abstract
We study the thermal buckling behavior of cylindrical shells reinforced with Functionally Graded (FG) wavy Carbon NanoTubes (CNTs), stiffened by stringers and rings, and subjected to a thermal loading. The equilibrium equations of the problem are built according to the Third-order Shear Deformation Theory (TSDT), whereas the stiffeners are modeled as Euler Bernoulli beams. Different types of FG distributions of wavy CNTs along the radial direction of the cylinder are herein considered, and temperature-dependent material properties are estimated via a micromechanical model, under the assumption of uniform distribution within the shell and through the thickness. A parametric investigation based on the Generalized Differential Quadrature (GDQ) method aims at investigating the effects of the aspect ratio and waviness index of CNTs on the thermal buckling of FG nanocomposite stiffened cylinders, reinforced with wavy single-walled CNTs. Some numerical examples are here provided in order to verify the accuracy of the proposed formulation and to investigate the effects of several parameters—including the volume fraction, the distribution pattern of wavy CNTs, and the cylinder thickness—on the thermal buckling behavior of the stiffened cylinders made of CNT-reinforced composite (CNTRC) material.
Highlights
Today, stiffened cylindrical shells are widely used in a variety of engineering systems, including aircraft, spacecraft, submarine, naval, automotive, and civil applications
This paper presents the thermal buckling analysis of Functionally Graded (FG) wavy carbon nanotube (CNT)-reinforced composite (CNTRC)-stiffened cylindrical shells subjected to a uniform thermal load
An innovative technique known as the Generalized Differential Quadrature (GDQ) method is here applied to solve the problem numerically while studying the effect of the agglomeration of the reinforcing phase for varying distributions of straight or wavy nanofibers scattered in the matrix and varying volume fraction distributions
Summary
Today, stiffened cylindrical shells are widely used in a variety of engineering systems, including aircraft, spacecraft, submarine, naval, automotive, and civil applications. The effect of temperature distributions on the mechanical properties of Functionally Graded Material (FGM) composites and non-homogeneous materials was studied in [27,28,29,30,31,32] while focusing on the presence of fibers or CNTs as reinforcement Such materials and structures, have shown complex thermal buckling behavior due to the large displacements and rotations they can experience in the presence of a generally distributed temperature. To this end, in the present work, we provide a parametric investigation on the stability of FG wavy CNT stiffened cylindrical shells under a uniform thermal loading, where the materials feature some temperature-dependent properties.
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