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Dynamic analysis of magnetorheological elastomer configured sandwich structures

Dynamic analysis of magnetorheological elastomer configured sandwich structures
Dynamic analysis of magnetorheological elastomer configured sandwich structures
The work presented in this thesis is concerned with the investigation of the dynamic behaviour of magnetorheological elastomers (MREs) and smart sandwich structures. An extensive review, covering existing smart materials and their applications, has highlighted that smart materials and structures can be applied to large scale structures. Comprehensive experimental tests have been carried out in order to gain knowledge and data on the dynamic shear properties and behaviour of stiffness change of MRE and MRE cored adaptive sandwich beam structures depending on magnetic fields. Dynamic shear property tests with different curing stages have been enhanced to obtain various properties. The new developed forced vibration test rig enabled forced vibration tests of MRE embedded sandwich beam with various aspects such as different magnetic field strength, various oscillations of force amplitudes, boundary conditions and damping effects under localised magnetic fields to be made. In parallel to these experimental investigations, a new theoretical model was developed by combining the magnetisation effects on iron particles in terms of the curing times. In addition, a new macro scale modelling approach for rubber like materials (nonlinear behaving materials) was made by adopting FEA analysis to obtain the optimum volume of pores and size of iron particles to enhance the performance of MREs. A higher order sandwich beam theory is extended to include damping properties of MRE. It has been demonstrated that a higher order sandwich beam theory appears to be the most versatile and accurate modelling method for a sandwich beam with an MRE core material. The results from higher order theory have been combined with a power flow analysis for the smart floating sandwich raft vibration isolation system. Finally, an experimental study was performed to illustrate the control capabilities of MRE adaptive vibration absorber for a propeller shaft in real time. From this research work, a better understanding of the dynamic behaviour of MRE embedded sandwich beam has been acquired.
University of Southampton
Choi, Won Jun
af10cfb1-4bc8-44af-ad9a-7aa81d732b9e
Choi, Won Jun
af10cfb1-4bc8-44af-ad9a-7aa81d732b9e
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Shenoi, Ramanand
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Brennan, Michael
87c7bca3-a9e5-46aa-9153-34c712355a13

Choi, Won Jun (2009) Dynamic analysis of magnetorheological elastomer configured sandwich structures. University of Southampton, School of Engineering Sciences, Doctoral Thesis, 211pp.

Record type: Thesis (Doctoral)

Abstract

The work presented in this thesis is concerned with the investigation of the dynamic behaviour of magnetorheological elastomers (MREs) and smart sandwich structures. An extensive review, covering existing smart materials and their applications, has highlighted that smart materials and structures can be applied to large scale structures. Comprehensive experimental tests have been carried out in order to gain knowledge and data on the dynamic shear properties and behaviour of stiffness change of MRE and MRE cored adaptive sandwich beam structures depending on magnetic fields. Dynamic shear property tests with different curing stages have been enhanced to obtain various properties. The new developed forced vibration test rig enabled forced vibration tests of MRE embedded sandwich beam with various aspects such as different magnetic field strength, various oscillations of force amplitudes, boundary conditions and damping effects under localised magnetic fields to be made. In parallel to these experimental investigations, a new theoretical model was developed by combining the magnetisation effects on iron particles in terms of the curing times. In addition, a new macro scale modelling approach for rubber like materials (nonlinear behaving materials) was made by adopting FEA analysis to obtain the optimum volume of pores and size of iron particles to enhance the performance of MREs. A higher order sandwich beam theory is extended to include damping properties of MRE. It has been demonstrated that a higher order sandwich beam theory appears to be the most versatile and accurate modelling method for a sandwich beam with an MRE core material. The results from higher order theory have been combined with a power flow analysis for the smart floating sandwich raft vibration isolation system. Finally, an experimental study was performed to illustrate the control capabilities of MRE adaptive vibration absorber for a propeller shaft in real time. From this research work, a better understanding of the dynamic behaviour of MRE embedded sandwich beam has been acquired.

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More information

Published date: June 2009
Organisations: University of Southampton

Identifiers

Local EPrints ID: 142601
URI: https://eprints.soton.ac.uk/id/eprint/142601
PURE UUID: 68c94047-7eb0-4c31-aed3-df319bc143d6
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

Catalogue record

Date deposited: 19 Aug 2010 11:45
Last modified: 06 Jun 2018 12:51

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Contributors

Author: Won Jun Choi
Thesis advisor: Yeping Xiong ORCID iD
Thesis advisor: Ramanand Shenoi
Thesis advisor: Michael Brennan

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