Investigation on the free vibration behavior of sandwich conical shells with reinforced cores

Zarei, Masoumeh; Rahimi, G. H.; Shahgholian‐Ghahfarokhi, Davoud

doi:10.1177/10996362211020426

Cited by 18 publications

(5 citation statements)

References 45 publications

(52 reference statements)

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“…In developing a mathematical model, the resultant forces and moments obtained are summarized in the form of a matrix 34,35 in whichHere…”

Section: Analytical Approachmentioning

confidence: 99%

“…They considered different parameters of the ribs to reach the optimum value of the buckling load and perceived that the effect of thickness changes should be involved in the analysis. Zarei et al 34,35 proposed a new effective model to obtain equivalent stiffness of the conical sandwich shell reinforced with lattice core. Results of many investigations are available on the buckling and vibrations of conical shells with uniform skin thickness.…”

Section: Introductionmentioning

confidence: 99%

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External pressure buckling of composite sandwich conical shells with variable skin thickness

Zarei

Rahimi

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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In this paper, an analytical model is developed to investigate the buckling analysis of the composite sandwich conical shell with variable skin thickness under lateral pressure loading. This problem involves composite shells, which are produced during the filament-winding process, where the skin thickness varies through the length of the shell. An effective smeared method is employed to reduce the reinforced lattice core into a layer. This is done by analyzing forces and moments on a unit cell. Therefore, equivalent stiffness parameters of reinforced lattice core are determined. By superimposing stiffness parameters due to the lattice core with those of the inner and outer skins, the equivalent stiffness of the sandwich panel will be obtained. Governing equations are established based on the first shear deformation theory. The power series method is used to extract the buckling load of the stiffened shell. To verify achieved results, a 3D finite element model is provided. Comparisons showed that the analytical solution is qualified enough to study the buckling behavior of the composite sandwich conical shell. Through this study, the effects of a set of important parameters like stiffener orientation angle, number of stiffeners, semi-vertex angle, and skin lamination are investigated.

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“…In developing a mathematical model, the resultant forces and moments obtained are summarized in the form of a matrix 34,35 in whichHere…”

Section: Analytical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

External pressure buckling of composite sandwich conical shells with variable skin thickness

Zarei

Rahimi

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Taati et al [21] investigated the free vibration of cylindrical shells of variable thickness using a closed form solution. Sandwich conical shells were studied by Zarei et al [22]. The Walsh series technique was used by Guo et al [23] to examine the frequencies of cone-shaped shells.…”

Section: Introductionmentioning

confidence: 99%

Conical-Shaped Shells of Non-Uniform Thickness Vibration Analysis Using Higher-Order Shear Deformation Theory

Javed

2024

Symmetry

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The aim of this research is to investigate the frequency of conical-shaped shells, consisting of different materials, based on higher-order shear deformation theory (HSDT). The shells are of non-uniform thickness, consisting of two to six symmetric cross-ply layers. Simply supported boundary conditions were used to analyse the frequency of conical-shaped shells. The differential equations, consisting of displacement and rotational functions, were approximated using spline approximation. A generalised eigenvalue problem was obtained and solved numerically for an eigenfrequency parameter and associated eigenvector of spline coefficients. The frequency of shells was analysed by varying the geometric parameters such as length of shell, cone angle, node number in circumference direction and number of layers, as well as three thickness variations such as linear, sinusoidal and exponential. It was also evident that by varying geometrical parameters, the mechanical parameters such as stress, moment and shear resultants were affected. Research results concluded that for three different thickness variations, as the number of layers of conical shells increases, the frequency values decrease. Moreover, by varying length ratios and cone angles, shells with variable thickness had lower frequency values compared to shells of constant thickness. The numerical results obtained were verified through the already existing literature. It is evident that the present results are very close to the already existing literature.

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“…4 The addition of soft and light materials as the core can enhance the overall performance of the sandwich structure. 5 However, debonding at the core-skin interphase region is one of the primary failure modes of the sandwich materials. Thus, the core-skin interphase, which is an area of polymeric resins typically spanning a few hundred microns, can lead to complicated and time-dependent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The effect of nanoclay on the performance of basalt-epoxy facesheet and foam core sandwich panels

Joseph

Muthukumar

et al. 2023

Jnl of Sandwich Structures & Materials

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It has been reported that the properties of a foam-based sandwich panel can be enhanced by incorporating nanoclay into the facesheet or foam core. In this study, an attempt was made to disperse nanoclay into the epoxy adhesive so as to bond the facesheet with the core. The sandwich panel in this study was fabricated using a basalt/epoxy laminate as the facesheet and polyvinyl chloride foam as the core material. The characterisation results through flexural and quasi-static indentation tests revealed that the infusion of nanoclay led to an increase of up to 34% in the bending strength, 51% in the core shear strength, and 72% in energy absorption. In addition, the nanoclay-reinforced sandwich panel showed a slightly higher sound absorption coefficient than the control specimen without nanoclay. Another interesting observation from the flexural and quasi-static indentation tests was that the addition of nanoclay also influenced the failure behaviour and the size of the damaged area. The superior energy and sound absorption characteristics make the foam-based sandwich panel a potential material for structural applications requiring acoustic insulation.

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Investigation on the free vibration behavior of sandwich conical shells with reinforced cores

Cited by 18 publications

References 45 publications

External pressure buckling of composite sandwich conical shells with variable skin thickness

External pressure buckling of composite sandwich conical shells with variable skin thickness

Conical-Shaped Shells of Non-Uniform Thickness Vibration Analysis Using Higher-Order Shear Deformation Theory

The effect of nanoclay on the performance of basalt-epoxy facesheet and foam core sandwich panels

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