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Amplitude and frequency dependence of magneto-sensitive rubber in a wide frequency range
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.ORCID iD: 0000-0001-5760-3919
2005 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 24, no 5, 656-662 p.Article in journal (Refereed) Published
Abstract [en]

Two new aspects of the dynamic behaviour in the audible frequency range of magneto-sensitive (MS) rubber are highlighted: the existence of an amplitude dependence of the shear modulus - referred to as the Fletcher-Gent effect - for even small displacements, and the appearance of large MS effects. In order to illustrate these two features, results are presented of measurements performed in the audible frequency range on two different kinds of rubber: silicone and natural rubber with a respective iron particle volume concentration of 33%. The particles used are of irregular shape and randomly distributed within the rubber. An external magnetic field of 0-0.8 T is applied. Both kinds of rubber are found to be strongly amplitude dependent and, furthermore, displaying large responses to externally applied magnetic fields - a maximum of 115%. Also included are graphs of measurements on silicone and natural rubber devoid of iron particles. Those results support the conclusion that introducing iron particles in the rubber gives rise to a strong, non-negligible, amplitude dependence in the entire frequency range.

Place, publisher, year, edition, pages
Elsevier, 2005. Vol. 24, no 5, 656-662 p.
Keyword [en]
magneto-sensitivity, Fletcher-Gent effect, rubber, amplitude dependence, audible frequency range
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-5907DOI: 10.1016/j.polymertesting.2005.04.001ISI: 000229979000018Scopus ID: 2-s2.0-19144365921OAI: oai:DiVA.org:kth-5907DiVA: diva2:10440
Note

QC 20100816

QC 20151208

Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2015-12-09Bibliographically approved
In thesis
1. Magneto-sensitive rubber in the audible frequency range
Open this publication in new window or tab >>Magneto-sensitive rubber in the audible frequency range
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The dynamic behaviour in the audible frequency range of magneto-sensitive (MS) rubber is the focus of this thesis consisting of five papers A-E. Paper A presents results drawn from experiments on samples subjected to different constant shear strains over varying frequencies and magnetic fields. Main features observed are the existence of an amplitude dependence of the shear modulus referred to as the Fletcher-Gent effect for even small displacements, and the appearance of large MS effects. These results are subsequently used in Paper B and C to model two magneto-sensitive rubber isolators, serving to demonstrate how, effectively, by means of MS rubber, these can be readily improved. The first model calculates the transfer stiffness of a torsionally excited isolator, and the second one, the energy flow into the foundation for a bushing inserted between a vibrating mass and an infinite plate. In both examples, notable improvements in isolation are obtainable. Paper D presents a non-linear constitutive model of MS rubber in the audible frequency range. Characteristics inherent to magneto-sensitive rubber within this dynamic regime are defined: magnetic sensitivity, amplitude dependence, elasticity and viscoelasticity. A very good agreement with experimental values is obtained. In Paper E, the magneto-sensitive rubber bushing stiffness for varying degrees of magnetization is predicted by incorporating the non-linear magneto-sensitive audio frequency rubber model developed in Paper D, into an effective engineering formula for the torsional stiffness of a rubber bushing. The results predict, and clearly display, the possibility of controlling over a large range through the application of a magnetic field, the magneto-sensitive rubber bushing stiffness.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-AVE, ISSN 1651-7660 ; 2006:37
Keyword
Magneto-sensitivity, Rubber, Audible frequency range, Amplitude dependence, Vibration isolator, Fletcher-Gent effect, Stiffness
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-4024 (URN)91-7178-392-X (ISBN)
Public defence
2006-06-14, F3, F, Lindstedtsvägen 26, KTH, 13:00
Opponent
Supervisors
Note
QC 20100816Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2010-11-24Bibliographically approved
2. Exploring the vibration control potential of magneto-sensitive rubber
Open this publication in new window or tab >>Exploring the vibration control potential of magneto-sensitive rubber
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Two new aspects of the dynamic behaviour in the audible frequency range of magneto-sensitive (MS) rubber are highlighted: the existence of an amplitude dependence of the shear modulus—referred to as the Fletcher–Gent effect—for even small displacements, and the appearance of large MS effects. These results have been obtained experimentally and are subsequently used to model two examples of magneto-sensitive rubber isolators to show how by means of MS rubber they can be improved. The first model calculates the transfer stiffness of a torsionally excited isolator and the second one the energy flow into the foundation for a bushing inserted between a vibrating mass and an infinite plate. In both examples notable improvements in isolation can be obtained

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 23 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2005:18
Keyword
Applied mechanics, magneto-sensitive rubber, Teknisk mekanik
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-241 (URN)
Presentation
2005-05-26, MWL 74, Farkost o Flyg, Teknikringen 8c, Stockholm, 18:00
Opponent
Supervisors
Note
QC 20101125Available from: 2005-05-31 Created: 2005-05-31 Last updated: 2010-11-25Bibliographically approved

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