A mechanical characterisation on multiple timescales of electroconductive magnetorheological elastomers

•An electroconductive magnetorheological elastomer is presented.•The material features a complex resistivity behaviour on several timescales.•The properties are sensitive to magnetic fields and strain velocity.•The material shows fatigue and relaxation behaviour.•The magnetorheological and the piezo...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-05, Vol.453, p.198-205
Main Authors: Schümann, M., Morich, J., Kaufhold, T., Böhm, V., Zimmermann, K., Odenbach, S.
Format: Article
Language:English
Subjects:
Addition polymerization
Elastic properties
Elastomers
Electric properties
Electrical properties
Electroconductive
Fatigue
Magnetic effects
Magnetic fields
Magnetic properties
Magnetism
Magneto-piezoresistivity
Magnetorheological elastomers
Mechanical properties
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Summary:•An electroconductive magnetorheological elastomer is presented.•The material features a complex resistivity behaviour on several timescales.•The properties are sensitive to magnetic fields and strain velocity.•The material shows fatigue and relaxation behaviour.•The magnetorheological and the piezoresistive behaviour appear not to interfere. Magnetorheological elastomers are a type of smart hybrid material which combines elastic properties of a soft elastomer matrix with magnetic properties of magnetic micro particles. This leads to a material with magnetically controllable mechanical properties of which the magnetorheological effect is the best known. The addition of electroconductive particles to the polymer mix adds electrical properties to the material behaviour. The resulting electrical resistance of the sample can be manipulated by external magnetic fields and mechanical loads. This results in a distinct interplay of mechanical, electrical and magnetic effects with a highly complex time behaviour. In this paper a mechanical characterisation on multiple time scales was conducted to get an insight on the short and long-term electrical and mechanical behaviour of this novel material. The results show a complex resistivity behaviour on several timescales, sensitive to magnetic fields and strain velocity. The observed material exhibits fatigue and relaxation behaviour, whereas the magnetorheological effect appears not to interfere with the piezoresistive properties.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.01.029