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Deepak Kumar Biswal

Bio: Deepak Kumar Biswal is an academic researcher from VIT University. The author has contributed to research in topics: Viscoelasticity & Shell (structure). The author has an hindex of 4, co-authored 6 publications receiving 63 citations. Previous affiliations of Deepak Kumar Biswal include National Institute of Technology, Rourkela.

Papers
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Journal ArticleDOI
TL;DR: In this article, the free vibration and damping characteristics study of multilayer sandwich spherical shell panels with viscoelastic material core layers and elastic face layers based on first order shear deformation theory is dealt with.
Abstract: The present work deals with the free vibration and damping characteristics study of multilayer sandwich spherical shell panels with viscoelastic material core layers and elastic face layers based on first order shear deformation theory. The displacements of the core layers are assumed to vary linearly along the thickness. Longitudinal and transverse deformations of the core layers are taken in to account with the consideration of independent transverse displacements of the elastic layers. The equation of motion is derived using Hamilton's principle in conjunction with the finite element method. Eight number of sandwich shell panels are studied mainly in two groups viz. sandwich panels with laminated base layer and isotropic base layer. Fundamental frequencies and associated system loss factors of different sandwich shell panels are deduced by solving the equation as an eigenvalue problem. The effect of thickness of the constraining layers, thickness of the core layers, viscoelastic material loss factor and aspect ratio on the natural frequencies and system loss factors of the sandwich structures are investigated.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the free vibration analysis of doubly curved sandwich shell panels with a core of viscoelastic material, constrained by a Functionally Graded Material (FGM) layer, is presented.

25 citations

Journal ArticleDOI
TL;DR: In this article, a shear deformable viscoelastic sandwich shell element is proposed for doubly curved sandwich shell panels with passive constrained layer damping (PCLD) treatment.
Abstract: In this work, a shear deformable viscoelastic sandwich shell element is proposed for doubly curved sandwich shell panels with passive constrained layer damping (PCLD) treatment. The transverse displacements of the constraining layer and base layer are considered to be independent, besides the in-plane displacements . The transverse and in-plane displacements of the viscoelastic core are considered to be varying linearly through the thickness. Shear as well as normal deformations of the core are included in the analysis. The equation of motion of the doubly curved sandwich shell panel under free vibration is derived via Hamilton's principle . The modal frequencies and modal loss factors of the Isotropic elastic-Viscoelastic-Isotropic elastic (IVI) sandwich shell panel and Laminated elastic-Viscoelastic-Laminated elastic (LVL) sandwich panel are obtained from numerical solutions, using finite element method in conjunction with Hamilton's principle. Parametric studies are carried out to ascertain the effects of shell geometries, aspect ratio, orthotropicity of the skins, core layer thickness, constraining layer thickness, core loss factor on the natural frequencies and system loss factors under different boundary conditions.

17 citations

Journal ArticleDOI
01 Oct 2018
TL;DR: In this article, the free vibration and static stability analyses of higher order shear deformable doubly curved shell panels have been carried out in the context of higher-order shear deformation theory.
Abstract: The free vibration and static stability analyses of higher order shear deformable doubly curved laminated shell panels have been carried out in this paper. The proposed shear deformation theory tak...

13 citations

Journal ArticleDOI
TL;DR: In this article, the buckling and parametric resonance characteristics of laminated composite spherical sandwich shell panels with viscoelastic material (VEM) core are investigated considering full geometric nonlinearity in the Green-Lagrange sense.
Abstract: The buckling and parametric resonance characteristics of laminated composite spherical sandwich shell panels with viscoelastic material (VEM) core are investigated in the present analysis considering full geometric nonlinearity in the Green–Lagrange sense. The study includes the longitudinal strain and normal strain in the transverse direction along with transverse shear deformation of the VEM core. The core displacements are considered to be varying linearly along the thickness and those of the face sheets follow first-order shear deformation theory. An eight-noded sandwich shell finite element of the serendipity family is adopted to discretize the sandwich shell panel domain. The finite element-based equation of motion is derived using Hamilton’s principle in the form of the Mathieu–Hill-type equation. The dynamic instability regions are obtained by applying Hsu’s criteria-based Saito–Otomi conditions to the transformed equation motion. An in-house finite element-based code is developed in the MATLAB platform to solve the stability problem and to establish the stability regions. A parametric study is carried out to investigate the influence of different system parameters on the critical buckling load and the parametric resonance of the sandwich shell panels. It is noted that an increase in core and constraining layer thicknesses increases the critical buckling load of the sandwich shell panels. The stability boundaries are observed to shift toward a higher-excitation-frequency region in the stability diagram with an increase in constraining layer thickness and a decrease in aspect ratio.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the dynamic stability behavior of a nanocomposite sandwich truncated conical shells (NSTCS) is analyzed using the Kelvin-Voigt model.
Abstract: Present research is conducted in order to assess dynamic stability behavior of a nanocomposite sandwich truncated conical shells (NSTCS). In fact, graphene platelets (GPLs)-reinforced as core layer is encompassed through magnetostrictive layers as face sheets. For modeling the core layer and face sheets mathematically, higher order shear deformation theory (HSDT) besides first order shear deformation theory (FSDT) are utilized, respectively. To presume this sandwich structure much more realistic, Kelvin-Voigt model will be used. According to Hamilton's principle with respect to continuity boundary conditions, the governing equations are obtained. Utilizing differential cubature (DC) as well as Bolotin procedures, the governing equations will be solved and the region related to the dynamic instability is achieved. In this novel work, different variables covering various boundary edges, controller, cone's semi vertex angle, damping, feedback gain, proportion of core to face sheets thickness, dispersion kinds of GPLs and its volume percent will be studied. So as to indicate the accuracy of applied theories as well as methods, the results are collated with another paper. It is found that increment of GPLs volume percent leads to rise of excitation frequency.

49 citations

Journal ArticleDOI
TL;DR: In this article, the free vibration and damping characteristics study of multilayer sandwich spherical shell panels with viscoelastic material core layers and elastic face layers based on first order shear deformation theory is dealt with.
Abstract: The present work deals with the free vibration and damping characteristics study of multilayer sandwich spherical shell panels with viscoelastic material core layers and elastic face layers based on first order shear deformation theory. The displacements of the core layers are assumed to vary linearly along the thickness. Longitudinal and transverse deformations of the core layers are taken in to account with the consideration of independent transverse displacements of the elastic layers. The equation of motion is derived using Hamilton's principle in conjunction with the finite element method. Eight number of sandwich shell panels are studied mainly in two groups viz. sandwich panels with laminated base layer and isotropic base layer. Fundamental frequencies and associated system loss factors of different sandwich shell panels are deduced by solving the equation as an eigenvalue problem. The effect of thickness of the constraining layers, thickness of the core layers, viscoelastic material loss factor and aspect ratio on the natural frequencies and system loss factors of the sandwich structures are investigated.

39 citations

Journal ArticleDOI
TL;DR: In this article, an improved unified approach of Rayleigh-Ritz method was presented to investigate the vibration and damping behavior of thin short cylindrical shell with viscoelastic damping materials treatment under arbitrary elastic edges.

36 citations

Journal ArticleDOI
TL;DR: In this article, the effects of mechanical properties, geometrical properties and the different types of CNTs on the vibration frequencies of doubly-curved nanoshells are investigated.
Abstract: In this paper, three-dimensional vibrations of carbon nanotubes (CNTs) reinforced isotropic doubly-curved nanoshells using nonlocal elasticity theory based on a new higher-order shear deformation theory (HSDT) is investigated. The considering higher-order shear deformation theory is a combination of sinus and exponential power with cosine function which is one of the most accurate shear deformation theory. One can conclude that combination of important theories such as Reddy's doubly-curved shells theory, nonlocal elasticity theory and higher-order shear deformation theory to a more complicated structure such as doubly-curved shells leads to important and novel work in context of mechanical engineering. The equations of motion and boundary conditions are derived using Hamilton's principle. The equations of motion are solved via Navier-type, closed-form solutions. From the best knowledge of authors, it is the first time that present formulation is used to investigate the vibration of carbon nanotubes reinforced doubly-curved nanoshells based on a new higher-order shear deformation theory. Also, it is the first time that small scale effects are considered in carbon nanotubes reinforced doubly-curved nanoshells made of isotropic materials. The effects of mechanical properties, geometrical properties and the different types of CNTs on the vibration frequencies of doubly-curved nanoshell are investigated. The comparison study is carried out to verify the accuracy of the proposed method. Numerical results indicate that the volume fraction and types of distribution of CNTs have considerable effects on the vibration characteristics of CNTs doubly-curved nanoshells. Presented results for vibrations can minister as benchmarks for future analysis of CNTs doubly-curved nanoshells.

34 citations

Journal ArticleDOI
TL;DR: In this article , the vibrational behavior of Coupled Hemispherical-ConicalConical Conical Shells (CHCCS) structures made composite materials reinforced with nanofillers is studied.

29 citations