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research-article

Optimal damping in circular cylindrical sandwich shells with a three-layered viscoelastic composite core

[+] Author and Article Information
Ambesh Kumar

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati-781039, India
ambesh@iitg.ernet.in

Satyajit Panda

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati-781039, India
spanda@iitg.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4036868 History: Received December 12, 2016; Revised April 30, 2017

Abstract

In this work, the damping characteristics of circular cylindrical sandwich shell with a three-layered viscoelastic composite core are investigated. The new composite core is comprised of the identical inclusions of graphite-strips which are axially embedded within a cylindrical viscoelastic core at its middle surface. The physical configuration of the composite core is attributed in the form of a cylindrical laminate of two identical monolithic viscoelastic layers over the inner and outer cylindrical surfaces of middle viscoelastic composite layer so that it is a three-layered viscoelastic composite core. A finite element (FE) model of the overall shell is developed based on the layer-wise deformation theory and Sander’s shell theory. Using this FE model, the damping characteristics of the shell are studied within an operating frequency-range after configuring the size and circumferential distribution of graphite-strips in optimal manner. The numerical results reveal significantly improved damping in the sandwich shell for the use of present three-layered composite core instead of traditional single-layered viscoelastic core. It is also found that the three-layered core provides the advantage in achieving damping at different natural modes as per their assigned relative importance while it is impossible in the use of single-layered viscoelastic core.

Copyright (c) 2017 by ASME
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