A semianalytical finite element for doubly curved, multilayered shells of revolution, based on an extension of the displacement field proposed by Wilkins et al., is proposed. Numerical analysis is done to study the vibration and damping characteristics of multilayered fluid filled shells with alternating elastic and viscoelastic layers. The effect of varying the number of viscoelastic layers on the vibration and damping characteristics is also studied. The effect of the fluid is incorporated by the added mass concept. The effect of shear parameter on natural frequency and modal loss factor is studied for various circumferential and axial modes.

C. Saravanan

N. Ganesan

Viswanatha Ramamurti

Constraint theory

Cylinders (shapes)

Damping

finite element method

Modal analysis

Natural frequencies

Strain

Structural analysis

Vibrations (mechanical)

Viscoelasticity

CONSTRAINED VISCOELASTIC DAMPING

MODAL LOSS FACTOR

MODAL STRAIN ENERGY METHODS

MULTILAYERED FLUID FILLED CYLINDRICAL SHELLS

Shells (structures)

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Vibration and damping analysis of multilayered fluid filled cylindrical shells with constrained viscoelastic damping using modal strain energy method

Computers and Structures

In this article, buckling and vibration behavior of a functionally graded material (FGM) sandwich beam having constrained viscoelastic layer (VEL) is studied in thermal environment by using finite element formulation. The FGM sandwich beam is assumed to be clamped on both edges. The material properties of FGM are functionally graded in thickness direction according to volume fraction power law distribution. Temperature dependent material properties of FGM stiff layer and shear modulus of viscoelastic layer are considered to carry out buckling and vibration analysis. Numerical studies involving the understanding the effect of power law index, core to stiff layer ratio on the thermal buckling temperature as well as on vibration has been carried out. In addition influence of temperature on natural frequencies and loss factors have been examined for FGM sandwich beam. © 2006 Elsevier Ltd. All rights reserved.

Journal of Sound and Vibration

Thermoelastic buckling and vibration behavior of a functionally graded sandwich beam with constrained viscoelastic core

This paper presents the buckling and vibration behavior of a viscoelastic sandwich cylinder in a thermal environment analyzed using the semi analytical finite element method. The analysis is carried out using a decoupled thermo mechanical formulation. The temperature field in the shell domain is evaluated using an eight-noded axisymmetric ring element. Buckling and vibration analyses are carried out using a two-noded sandwich shell element in the semi-analytical finite element method. Buckling temperatures are calculated for sandwich shells with two different core materials. The effect of temperature-dependent core shear modulus on buckling temperature and vibration behavior has been investigated for sandwich shells with different mechanical boundary conditions. Variations of natural frequencies and loss factors with temperature have also been examined for sandwich shells with two different core materials.

International Journal of Computational Methods in Engineering Science and Mechanics

Buckling and vibration behavior of a viscoelastic sandwich cylinder under thermal environment

The finite element code is developed based on the displacement field proposed by Wilkins et al. to find out the natural frequencies and loss factors of fluid filled cylindrical shells with a constrained viscoelastic layer in between two facings made of composite material. The fluid effect on the natural frequencies and loss factors are taken care of by the added mass of the fluid on the structure. Effects of the fluid height, ratio of core to facing thickness and facing fibre orientation on the natural frequencies and loss factors of cylindrical shells are presented.

Vibration and damping analysis of fluid filled orthotropic cylindrical shells with constrained viscoelastic damping

The free vibration and damping characteristics of three-layered conical shells with a viscoelastic core constrained by isotropic facings are studied using the finite element method. Results are presented for shells with various geometric and physical parameters. Three boundary conditions are considered in the analysis: clamped-clamped, simply supported and clamped at the small end and free at the other. © 1994 Academic Press Limited.

Finite element analysis of conical shells with a constrained viscoelastic layer

The natural frequencies and loss factors in cylindrical shells with a constrained viscoelastic layer between two isotropic, elastic facings are studied using the finite element method. The finite element is developed based on a discrete layer theory assuming variation of inplane displacements across the thickness and a constant transverse displacement. Effects of the boundary conditions, shear parameter and ratio of core to facing thickness on the natural frequencies and loss factors of cylindrical shells are presented. © 1993.

Vibration and damping analysis of cylindrical shells with a constrained damping layer

Pressure Vessels

An overview of pressure vessels under external pressure

Applied Mechanics Reviews

Computational Models for Sandwich Panels and Shells

Journal	Computers and Structures
ISSN	00457949
Open Access	No