Magnetorheological elastomer

For other uses, see MRE (disambiguation).

Magnetorheological elastomers (MREs) (also called magnetosensitive elastomers) are a class of solids that consist of polymeric matrix with embedded micro- or nano-sized ferromagnetic particles such as carbonyl iron. As a result of this composite microstructure, the mechanical properties of these materials can be controlled by the application of magnetic field.

Fabrication

MREs are typically prepared by curing process for polymers. The polymeric material (e.g. silicone rubber) in its liquid state is mixed with iron powder and several other additives to enhance their mechanical properties.[1] The entire mixture is then cured at high temperature. Curing in the presence of a magnetic field causes the iron particles to arrange in chain like structures resulting in an anisotropic material. If magnetic field is not applied, then iron-particles are randomly distributed in the solid resulting in an isotropic material.

Classification

MREs can be classified according to several parameters like: particles type, matrix, structure and distribution of particles:[2]

Particles magnetic properties

Matrix structure

Matrix electrical properties

Distribution of particles

Theoretical Studies

In order to understand magneto-mechanical behaviour of MREs, theoretical studies need to be performed which couple the theories of electromagnetism with mechanics. Such theories are called theories of magneto-mechanics.[3][4][5] A parallel branch of theoretical study is performed in the case of electro-mechanics.

Applications

MREs have been used for vibration isolation applications since their stiffness changes within a magnetic field [6][7]

References

  1. ↑ Jolly, M. R., Carlson, J. D. & Muñoz, B. C. A model of the behaviour of magnetorheological materials. Smart Mater. Struct. 5, 607–614 (1996).
  2. ↑ Anna Boczkowska and Stefan Awietjan (2012). Microstructure and Properties of Magnetorheological Elastomers, Advanced Elastomers - Technology, Properties and Applications, D.Sc. Anna Boczkowska (Ed.), ISBN 978-953-51-0739-2, InTech, DOI: 10.5772/50430
  3. ↑ Kankanala, S. V. & Triantafyllidis, N. On finitely strained magnetorheological elastomers. J. Mech. Phys. Solids 52, 2869–2908 (2004).
  4. ↑ Dorfmann, A. & Ogden, R. W. Magnetoelastic modelling of elastomers. Eur. J. Mech. - A/Solids 22, 497–507 (2003).
  5. ↑ Saxena, P., Hossain, M. & Steinmann, P. A theory of finite deformation magneto-viscoelasticity. Int. J. Solids Struct. 50, 3886–3897 (2013) [link].
  6. ↑ Deng, H. X., Gong, X. L. & Wang, L. H. Development of an adaptive tuned vibration absorber with magnetorheological elastomer. Smart Mater. Struct. 15, N111-N116 (2006) [link].
  7. ↑ Behrooz, M., Wang, X. & Gordaninejad, F. Performance of a new magnetorheological elastomer isolation system. Smart Mater. Struct. 23, 045014 (2014) [link].

Further reading

"Mathematical modelling of non-linear magneto- and electro-active rubber-like materials" (PDF). 

"The Elastic and Damping Properties of Magnetorheological Elastomers" (PDF). 

"Theory and Numerical Aspects of Constitutive Modeling in Finite Deformation Magnetomechanics" (PDF). 

"Huge Magnetostriction of Magnetorheological Composite" (PDF). 

See also

This article is issued from Wikipedia - version of the Tuesday, September 22, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.