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Frequency study of functionally graded multilayer graphene platelet-reinforced polymer cylindrical panels

Farsadi T., Asadi D., Kurtaran H.

Archives of Mechanics

2021

Vol. 73, nr 5-6

471--498

In this study, nonlinear fundamental natural frequencies of Functionally Graded (FG) multilayer Graphene Platelet-reinforced Polymer Composite (GPL-RPC) curved cylindrical panels are studied. It is considered that the Graphene Platelet (GPL) nanofillers are distributed in the matrix either uniformly or nonuniformly along the thickness direction. Four GPL distribution patterns namely, UD, FG-O, FG-X, and FG-A are considered. The effective material properties of GPL-RPC layers are obtained via the modified Halpin–Tsai micromechanics model and the rule of the mixture. A nonlinear structural model is utilized based on the virtual work principle. Green’s nonlinear kinematic strain relations are used to account for the geometric nonlinearities and the First-order Shear Deformation Theory (FSDT) is adopted to generalize the formulation for the case of moderately thick cylindrical panels including transverse shear deformations. The Generalized Differential Quadrature (GDQ) method of solution is employed to solve the nonlinear governing equations of motion. The present study aims to study the effect of GPL weight fraction for the proposed distribution patterns on the nonlinear fundamental frequency of functionally graded GPL-RPC cylindrical panels with different boundary conditions.

Experimental study on ultimate strength of CK20 steel cylindrical panels subjected to compressive axial load

Shariati M., Sedighi M., Saemi J., Eipakchi H. R., Allahbakhsh H. R.

Archives of Civil and Mechanical Engineering

2010

Vol. 10, no 2

117-130

In this paper, the effects of the length, sector angle and boundary conditions on the buckling load and postbuckling behaviour of cylindrical panels have been studied, experimentally. The compressive axial load has been applied on the panels using servo-hydraulic machine and different boundary conditions have been prepared by suitable fixtures. The presented results can be used in designing of these structures.

W pracy przedstawiono eksperymentalne wyniki wpływu długości i kąta sektora próbek oraz warunków brzegowych na siłę wyboczenia oraz ich zachowanie się po wyboczeniu. Badania przeprowadzono na maszynie hydraulicznej, gdzie za pomocą odpowiednich uchwytów uzyskano różne warunki brzegowe. Przedstawione wyniki mogą być wykorzystane w projektowaniu struktur cylindrycznych.