The elastic and damping properties of magnetorheological elastomers

Dissertation

Marke Kallio

Research output: ThesisDissertationMonograph

Abstract

Magnetorheological elastomers (MREs) belong to the group of so-called smart materials, which respond to an external stimulus by changing their viscoelastic properties. Magnetorheological (MR) material can be fluid, gel or solid material. The mechanical properties of the MR materials change when subjected to an external magnetic field. The MREs are interesting candidates especially for the active stiffness and vibration control of structural systems. The aim of this study was to increase the knowledge on the mechanical and viscoelastic properties of isotropic and aligned MREs. The focus was to clarify the changes in the elastic and vibration damping properties of both studied types of MREs when subjected to magnetic field. Isotropic and aligned MREs were prepared from silicone elastomer matrix with varying carbonyl iron content. The MREs were tested in bending and compression modes with sinusoidal dynamic loading. The 3-point bending experiments were carried out using a dynamic mechanical analyzer (DMA) in resonance for both isotropic and aligned MREs where the filler content varied from 0 to 30 vol.%. For characterizing the materials in compression with applied magnetic field, a special coil device was designed. Isotropic and aligned MREs with 30 vol.% of Fe were also characterized in dynamic compression with varying frequencies and strain amplitudes. The spring constant, elastic/shear modulus and damping ratio/loss factor values were calculated on the basis of the measured data with and without applied magnetic field. The results show, that the stiffness and damping properties of both isotropic and aligned MREs can be modified by applying external magnetic field. The damping and stiffness properties of the MREs depend significantly on the mutual directions of load, magnetic field and the particle alignment in the composite.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Tampere University of Technology (TUT)
Supervisors/Advisors
  • Schwartz, Ricardo , Supervisor, External person
  • Tiainen, Tuomo, Supervisor, External person
Award date27 May 2005
Place of PublicationEspoo
Publisher
Print ISBNs951-38-6447-2
Electronic ISBNs951-38-6639-4
Publication statusPublished - 2005
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

Elastomers
Damping
Magnetic fields
Stiffness
Intelligent materials
Vibration control
Elastic constants
Silicones
Vibrations (mechanical)
Fillers
Compaction
Gels
Elastic moduli
Iron
Mechanical properties
Fluids
Composite materials

Keywords

  • magnetorheological elastomers
  • elastic properties
  • mechanical properties
  • viscoelastic properties
  • iron-carbonyl compounds
  • stiffness damping properties
  • magnetic field strength
  • external load
  • particle network structure

Cite this

Kallio, M. (2005). The elastic and damping properties of magnetorheological elastomers: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Kallio, Marke. / The elastic and damping properties of magnetorheological elastomers : Dissertation. Espoo : VTT Technical Research Centre of Finland, 2005. 149 p.
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abstract = "Magnetorheological elastomers (MREs) belong to the group of so-called smart materials, which respond to an external stimulus by changing their viscoelastic properties. Magnetorheological (MR) material can be fluid, gel or solid material. The mechanical properties of the MR materials change when subjected to an external magnetic field. The MREs are interesting candidates especially for the active stiffness and vibration control of structural systems. The aim of this study was to increase the knowledge on the mechanical and viscoelastic properties of isotropic and aligned MREs. The focus was to clarify the changes in the elastic and vibration damping properties of both studied types of MREs when subjected to magnetic field. Isotropic and aligned MREs were prepared from silicone elastomer matrix with varying carbonyl iron content. The MREs were tested in bending and compression modes with sinusoidal dynamic loading. The 3-point bending experiments were carried out using a dynamic mechanical analyzer (DMA) in resonance for both isotropic and aligned MREs where the filler content varied from 0 to 30 vol.{\%}. For characterizing the materials in compression with applied magnetic field, a special coil device was designed. Isotropic and aligned MREs with 30 vol.{\%} of Fe were also characterized in dynamic compression with varying frequencies and strain amplitudes. The spring constant, elastic/shear modulus and damping ratio/loss factor values were calculated on the basis of the measured data with and without applied magnetic field. The results show, that the stiffness and damping properties of both isotropic and aligned MREs can be modified by applying external magnetic field. The damping and stiffness properties of the MREs depend significantly on the mutual directions of load, magnetic field and the particle alignment in the composite.",
keywords = "magnetorheological elastomers, elastic properties, mechanical properties, viscoelastic properties, iron-carbonyl compounds, stiffness damping properties, magnetic field strength, external load, particle network structure",
author = "Marke Kallio",
year = "2005",
language = "English",
isbn = "951-38-6447-2",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "565",
address = "Finland",
school = "Tampere University of Technology (TUT)",

}

Kallio, M 2005, 'The elastic and damping properties of magnetorheological elastomers: Dissertation', Doctor Degree, Tampere University of Technology (TUT), Espoo.

The elastic and damping properties of magnetorheological elastomers : Dissertation. / Kallio, Marke.

Espoo : VTT Technical Research Centre of Finland, 2005. 149 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - The elastic and damping properties of magnetorheological elastomers

T2 - Dissertation

AU - Kallio, Marke

PY - 2005

Y1 - 2005

N2 - Magnetorheological elastomers (MREs) belong to the group of so-called smart materials, which respond to an external stimulus by changing their viscoelastic properties. Magnetorheological (MR) material can be fluid, gel or solid material. The mechanical properties of the MR materials change when subjected to an external magnetic field. The MREs are interesting candidates especially for the active stiffness and vibration control of structural systems. The aim of this study was to increase the knowledge on the mechanical and viscoelastic properties of isotropic and aligned MREs. The focus was to clarify the changes in the elastic and vibration damping properties of both studied types of MREs when subjected to magnetic field. Isotropic and aligned MREs were prepared from silicone elastomer matrix with varying carbonyl iron content. The MREs were tested in bending and compression modes with sinusoidal dynamic loading. The 3-point bending experiments were carried out using a dynamic mechanical analyzer (DMA) in resonance for both isotropic and aligned MREs where the filler content varied from 0 to 30 vol.%. For characterizing the materials in compression with applied magnetic field, a special coil device was designed. Isotropic and aligned MREs with 30 vol.% of Fe were also characterized in dynamic compression with varying frequencies and strain amplitudes. The spring constant, elastic/shear modulus and damping ratio/loss factor values were calculated on the basis of the measured data with and without applied magnetic field. The results show, that the stiffness and damping properties of both isotropic and aligned MREs can be modified by applying external magnetic field. The damping and stiffness properties of the MREs depend significantly on the mutual directions of load, magnetic field and the particle alignment in the composite.

AB - Magnetorheological elastomers (MREs) belong to the group of so-called smart materials, which respond to an external stimulus by changing their viscoelastic properties. Magnetorheological (MR) material can be fluid, gel or solid material. The mechanical properties of the MR materials change when subjected to an external magnetic field. The MREs are interesting candidates especially for the active stiffness and vibration control of structural systems. The aim of this study was to increase the knowledge on the mechanical and viscoelastic properties of isotropic and aligned MREs. The focus was to clarify the changes in the elastic and vibration damping properties of both studied types of MREs when subjected to magnetic field. Isotropic and aligned MREs were prepared from silicone elastomer matrix with varying carbonyl iron content. The MREs were tested in bending and compression modes with sinusoidal dynamic loading. The 3-point bending experiments were carried out using a dynamic mechanical analyzer (DMA) in resonance for both isotropic and aligned MREs where the filler content varied from 0 to 30 vol.%. For characterizing the materials in compression with applied magnetic field, a special coil device was designed. Isotropic and aligned MREs with 30 vol.% of Fe were also characterized in dynamic compression with varying frequencies and strain amplitudes. The spring constant, elastic/shear modulus and damping ratio/loss factor values were calculated on the basis of the measured data with and without applied magnetic field. The results show, that the stiffness and damping properties of both isotropic and aligned MREs can be modified by applying external magnetic field. The damping and stiffness properties of the MREs depend significantly on the mutual directions of load, magnetic field and the particle alignment in the composite.

KW - magnetorheological elastomers

KW - elastic properties

KW - mechanical properties

KW - viscoelastic properties

KW - iron-carbonyl compounds

KW - stiffness damping properties

KW - magnetic field strength

KW - external load

KW - particle network structure

M3 - Dissertation

SN - 951-38-6447-2

T3 - VTT Publications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Kallio M. The elastic and damping properties of magnetorheological elastomers: Dissertation. Espoo: VTT Technical Research Centre of Finland, 2005. 149 p.