Study on the Vibration of a Sandwich Beam with Smart Composites—MRF

2007 ◽  
Vol 546-549 ◽  
pp. 1649-1654 ◽  
Author(s):  
Bai Xiang Hu ◽  
Guo Liang Zheng ◽  
Pin Qi Xia
Keyword(s):  
Magnetic Field ◽  
Composite Material ◽  
Composite Beam ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Sandwich Beam ◽  
Smart Composite ◽  
Smart Composites ◽  
Vibration Model ◽  
Vibration Responses

Smart composite material-MRF’s rheological properties such as viscosity and shear modulus can vary when subjected to different magnetic fields. This paper established the vibration model of the smart composite beam featuring MRF. The vibration analysis was finished under different magnetic field strengths using the method of complex stiffness. The experiment was performed to validate the theoretical predicted vibration responses. From both studies, the natural frequencies and loss factors of the MRF beam were shifted to a higher lever when the applied magnetic field increases. From the findings of the analysis, it is observed that MRF presents vibration control capabilities.

Vibration Analysis of a Laminated Composite Magnetorheological Elastomer Sandwich Beam

2014 ◽  
Vol 592-594 ◽  
pp. 2097-2101 ◽  
Author(s):  
Babu V. Ramesh ◽  
R. Vasudevan ◽  
Naveen B. Kumar
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Boundary Conditions ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Sandwich Beam ◽  
Laminated Composite ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Magnetorheological Elastomer

In this study, the vibration analysis of a laminated composite magnetorheological elastomer (MRE) sandwich beam is presented. The governing differential equations of motion of a sandwich beam embedding a MRE layer as core layer and laminated composite beams as the face layers are presented in a finite element formulation. The validity of the developed finite element formulation is demonstrated by comparing results in terms of the natural frequencies derived from the present finite element formulation with those in the available literature. Various parametric studies are also performed to investigate the effect of a magnetic field on the variation of the natural frequencies and loss factors of the MR elastomer composite sandwich beam under various boundary conditions. Furthermore, the effect of the thickness of the MR elastomer layer on the variation of the natural frequencies and loss factors are studied. The study suggested that the natural frequency increases with increasing magnetic field, irrespective of the boundary conditions.

Free Vibration Analysis of a Carbon Nanotube Reinforced Composite Beam

2014 ◽  
Vol 592-594 ◽  
pp. 2041-2045 ◽  
Author(s):  
B. Naresh ◽  
A. Ananda Babu ◽  
P. Edwin Sudhagar ◽  
A. Anisa Thaslim ◽  
R. Vasudevan
Keyword(s):  
Carbon Nanotube ◽  
Free Vibration ◽  
Composite Beam ◽  
Natural Frequencies ◽  
Equations Of Motion ◽  
Free Vibration Analysis ◽  
Mode Shapes ◽  
Element Formulation ◽  
Reinforced Composite ◽  
Vibration Responses

In this study, free vibration responses of a carbon nanotube reinforced composite beam are investigated. The governing differential equations of motion of a carbon nanotube (CNT) reinforced composite beam are presented in finite element formulation. The validity of the developed formulation is demonstrated by comparing the natural frequencies evaluated using present FEM with those of available literature. Various parametric studies are also performed to investigate the effect of aspect ratio and percentage of CNT content and boundary conditions on natural frequencies and mode shapes of a carbon nanotube reinforced composite beam. It is shown that the addition of carbon nanotube in fiber reinforced composite beam increases the stiffness of the structure and consequently increases the natural frequencies and alter the mode shapes.

Free vibration analysis of smart composite beam

2017 ◽  
Vol 4 (2) ◽  
pp. 2487-2491 ◽  
Author(s):  
G.A. Yashavantha Kumar ◽  
K.M Sathish Kumar
Keyword(s):  
Free Vibration ◽  
Composite Beam ◽  
Vibration Analysis ◽  
Free Vibration Analysis ◽  
Smart Composite

Magneto-mechanical vibration analysis of single-/three-layered micro-Timoshenko porous beam and graphene platelet as reinforcement based on modified strain gradient theory and differential quadrature method

2020 ◽  
pp. 107754632094908
Author(s):  
Mehdi Mohammadimehr ◽  
Mojtaba Mehrabi ◽  
Fatemeh S Mousavinejad
Keyword(s):  
Magnetic Field ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Differential Quadrature Method ◽  
Strain Gradient Theory ◽  
Gradient Theory ◽  
Modified Strain Gradient Theory ◽  
Graphene Platelet ◽  
Graphene Platelets ◽  
Equations Of Motions

This article discusses about vibration analysis of single-/three-layered microsandwich Timoshenko beams with porous core and graphene platelet–reinforced composite face sheets under magnetic field and elastic foundation based on the modified strain gradient theory. It is assumed that the material properties of matrix and reinforcement vary in thickness directions. Hamilton’s principle based on the energy approach is used to obtain the governing equations of motions. The equations of motions are solved using a numerical differential quadrature method for various boundary conditions. The obtained results of this study are compared with other previous research studies, and there is a good agreement between them. Moreover, the effects of different parameters such as length-to-thickness ratio, magnetic field, various distributions of graphene platelets and porous beams, and volume fractions of graphene platelets are studied on the dimensionless natural frequencies. In fact, the main idea of this work is combination of structure reinforcement with magnetic field and graphene platelets on the sandwich porous beams at microscale, and the effects of these parameters are developed on the dimensionless natural frequencies of the microbeam. The results of the present study demonstrate that applying magnetic field and increasing its intensity lead to enhance the natural frequency. Also, it is showed that graphene platelet reinforcement with one percent of weight fraction has an effective effect on the increasing dimensionless natural frequencies of the microporous beam. Thus, it can be predicted that graphene platelets can be used instead of nanotubes because they do not have the problem of nanotube accumulation and they are more economical than nanotubes.

Damping Characteristics of a NiMnGa/Polymer Composite Material

2007 ◽  
Vol 561-565 ◽  
pp. 697-699 ◽  
Author(s):  
Xiao Gang Sun ◽  
Chao Ying Xie
Keyword(s):  
Magnetic Field ◽  
Composite Material ◽  
Composite Materials ◽  
Polymer Composites ◽  
Polymer Composite Material ◽  
Smart Composite ◽  
Functional Elements ◽  
Damping Characteristics ◽  
Damping Behavior ◽  
Smart Composite Materials

NiMnGa alloys are attractive for the magnetic induced shape memory effect, especially as promising functional elements in smart composite materials and structures. Recently, more attentions are put on NiMnGa composite materials. In this paper, NiMnGa particles have been dispersed and oriented in a polymer matrix with high content under magnetic field. The damping behavior of NiMnGa/polymer composites was investigated in by DMA, contrasting to the pure polymer.

Torsional vibration analysis of a rotating tapered sandwich beam with magnetorheological elastomer core

2018 ◽  
Vol 29 (11) ◽  
pp. 2406-2423 ◽  
Author(s):  
Saeed Bornassi ◽  
Hossein M Navazi
Keyword(s):  
Magnetic Field ◽  
Layer Thickness ◽  
Torsional Vibration ◽  
Vibration Analysis ◽  
Sandwich Beam ◽  
Vibration Characteristics ◽  
Magnetorheological Elastomer ◽  
Lagrange Equations ◽  
Rotating Speed ◽  
Setting Angle

In this study, the torsional vibration analysis of a rotating tapered sandwich beam with a magnetorheological elastomer core has been investigated. The magnetorheological elastomer material is used as a constrained damping layer embedded between two elastic constraining skins in order to improve the vibrational behavior of the sandwich beam. The three layers of the sandwich beam have rectangular cross-sections with symmetric arrangement. The problem formulation is set up based on the torsional theory of rectangular laminated plates. The assumed modes method and the Lagrange equations are used to derive the governing equations of motion of the system. The validity of the presented formulation is confirmed through comparison of the obtained results with those available in the literature. A detailed parametric study is carried out to investigate the effects of applied magnetic field, tapering ratios, magnetorheological elastomer layer thickness, rotating speed, hub radius, and setting angle on the free vibration characteristics of the sandwich beam. The results show that magnetic field intensity, magnetorheological elastomer layer thickness, and tapering ratio have significant influences on the torsional vibrating characteristics of the sandwich beam, and the effects of rotating speed and hub radius are considerable. The setting angle has no substantial effect on the torsional vibration characteristics.

On the Free Vibration Analysis of a Sandwich Beam With Tip Mass

2018 ◽  
Author(s):  
E. F. Joubaneh ◽  
O. R. Barry
Keyword(s):  
Free Vibration ◽  
Boundary Conditions ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Equations Of Motion ◽  
Sandwich Beam ◽  
Free Vibration Analysis ◽  
Design Parameters ◽  
Governing Equations ◽  
Tip Mass

This paper presents the free vibration analysis of a sandwich beam with a tip mass using higher order sandwich panel theory (HSAPT). The governing equations of motion and boundary conditions are obtained using Hamilton’s principle. General Differential Quadrature (GDQ) is employed to solve the system governing equations of motion. The natural frequencies and mode shapes of the system are presented and Ansys simulation is performed to validate the results. Various boundary conditions are also employed to examine the natural frequencies of the sandwich beam without tip mass and the results are compared with those found in the literature. Parametric studies are conducted to examine the effect of key design parameters on the natural frequencies of the sandwich beam with and without tip mass.

scholarly journals Vibration Analysis of Carbon Fiber Reinforced Laminated Composite Skin with Glass Honeycomb Sandwich Beam Using HSDT

2017 ◽  
Vol 61 (3) ◽  
pp. 213 ◽  
Author(s):  
Mageshwaran Subramani ◽  
Ananda Babu Arumugam ◽  
Manoharan Ramamoorthy
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Sandwich Beam ◽  
Laminated Composite ◽  
Element Model ◽  
Composite Sandwich ◽  
The Core ◽  
Core Thickness

In this paper, the vibration analysis of uniform laminated composite sandwich beam with a viscoelastic core was studied. The governing equation of motion of the laminated composite sandwich beam has been derived based on higher order shear deformation theory (HSDT) in finite element model (FEM). The developed finite element model has been validated in terms of natural frequencies with the experimental values and the available literature. Various parametric studies have been performed to examine the impact of the core thickness, ply orientation and aspect ratio of the uniform laminated composite sandwich beam in response to free vibration for various boundary conditions. From the results it was concluded that that natural frequencies could be increased with increasing the core thickness and decreased with increasing the aspect ratio.

Analysis of vibration characteristics of elastic metamaterial sandwich beam

2021 ◽  
pp. 2150160
Author(s):  
Haisheng Shu ◽  
Yongchun Xu ◽  
Di Mu ◽  
Xiaotian Wang ◽  
Yu Wang
Keyword(s):  
Forced Vibration ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Dynamic Properties ◽  
Sandwich Beam ◽  
Solution Process ◽  
Vibration Characteristics ◽  
Formation Mechanisms ◽  
Infinite Domains ◽  
Simplified Solution

Elastic metamaterials (EMs) are a new kind of artificial composite medium composed of complex micro-structural elements, which have unique dynamic properties and elastic wave regulation ability that their constituent materials do not possess. The existing researches on EMs mainly focus on wave characteristics in two-dimensional and three-dimensional infinite domains. However, actual EM structures are always in the form of finite structures such as rods, beams and plates, so it is more important for engineering applications to understand and master their natural and forced vibration characteristics. Therefore, it is necessary to establish an effective simplified solution method and framework with certain accuracy for the vibration analysis of such structures. In the early stage, we have studied the natural and forced vibration characteristics of EM beams from this point of view, and presented a simplified solution process. In this paper, a kind of sandwich beam structure with EMs as the core is further constructed, the simplified solution process is extended to such more practical model analysis, and the free and steady forced vibration analysis processes of the finite-size sandwich beam are given. The vibration characteristics different from the traditional sandwich beam are investigated, and some interesting and useful phenomena are revealed, including the absence of natural frequencies within bandgap (BG), the gathering of natural frequencies in the vicinity of band edges, and the particular modal correspondence before and after BG. Then, the corresponding formation mechanisms are explained from the perspective of wave propagation.

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