4.7 Article

New experimental insights into magneto-mechanical rate dependences of magnetorheological elastomers

期刊

COMPOSITES PART B-ENGINEERING
卷 224, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109148

关键词

Magneto-rheological elastomers (MREs); Magneto-mechanical rheology; Multifunctional composites; Viscoelasticity; Smart materials; Experimental mechanics

资金

  1. European Research Council (ERC) under the European Union [947723]
  2. Ministerio de Ciencia, Innovacion y Universidades, Spain [FPU19/03874]
  3. Talent Attraction grant by Comunidad de Madrid [CM 2018 2018-T2/IND-9992]
  4. European Research Council (ERC) [947723] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

Magnetorheological elastomers (MREs) are promising multifunctional composites with the ability to respond to external magnetic fields, making them ideal for soft robotics and bioengineering applications. However, there is still a lack of understanding in the magneto-mechanical properties of these materials, particularly in relation to rate dependences. Further research is needed to explore the interactions of rate dependences on their magnetorheological behavior.
Magnetorheological elastomers (MREs), consisting of an elastomeric matrix filled with magnetic particles, are one of the most promising multifunctional composites. The main advantage of these materials is their response to external magnetic fields by mechanically deforming and/or changing their magnetorheological properties. This multi-physical nature makes them ideal candidates for timely applications in soft robotics and bioengineering. Although several works have addressed the magneto-mechanical coupling in these composites from both experimental and modelling approaches, there is still a big gap of knowledge preventing the full understanding of their underlying physics. In this regard, there is no experimental work addressing a comprehensive magneto-mechanical characterisation combining different MRE configurations, mechanical deformation modes and magnetic conditions. Furthermore, the interplays of rate dependences into such magnetorheological behaviour still remain elusive. In this work, we provide an unprecedented experimental characterisation of a soft MRE considering more than 100 different experimental conditions involving more than 600 tests. The experiments include monotonous uniaxial compression at different deformation rates and magnetic conditions, magneto-mechanical DMA tests, relaxation tests, oscillatory shear tests at different deformation rates and magnetic conditions, magneto-mechanical shear frequency sweep tests, and novel magneto-mechanical experiments. The results obtained in this work provide full characterisation of soft MREs with a special focus on rate dependences, forming the basis to explain novel multifunctional mechanisms identified behind their coupled response. In addition, it opens the door to new constitutive and modelling approaches.

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