Publication: New experimental insights into magneto-mechanical rate dependences of magnetorheological elastomers
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2021-11-01
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Elsevier
Abstract
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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Keywords
Magneto-rheological elastomers (Mres), Magneto-mechanical rheology, Nultifunctional composites, Viscoelasticity, Smart Materials, Experimental mechanics
Bibliographic citation
Moreno, M. A., Gonzalez-Rico, J., Lopez-Donaire, M. L., Arias, A., & Garcia-Gonzalez, D. (2021). New experimental insights into magneto-mechanical rate dependences of magnetorheological elastomers. En Composites Part B: Engineering, 224, p. 109148.