RT Unpublished Material
T1 Effects of soft and hard magnetic particles on the mechanical performance of ultra-soft magnetorheological elastomers
A1 Moreno Mateos, Miguel Ángel
A1 López Donaire, María Luisa
A1 Hossain, Mokarram
A1 García González, Daniel
AB Magnetorheological elastomers (MREs) mechanically respond to external magnetic stimuli by changingtheir mechanical properties and/or changing their shape. Recent studies have shown the great potential ofMREs when manufactured with an extremely soft matrix and soft-magnetic particles. Under the applicationof an external magnetic field, such MREs present significant mechanical stiffening, and when the magneticfield is off, they show a softer response, being these alternative states fully reversible. Although softmagneticparticles are suitable for their high magnetic susceptibility, they require the magnetic actuation toremain constant in order to achieve the magneto-mechanical stiffening. Here, we present an alternative solutionbased on hard-magnetic MREs to provide stiffening responses that can be sustained along time withoutthe need of keeping the external magnetic field on. To this end, we manufacture novel extremely soft hardmagneticMREs (stiffness in the order of 1 kPa) and characterise them under magneto-mechanical shear andconfined magnetic expansion deformation modes, providing a comparison framework with the soft-magneticcounterparts. The extremely soft nature of the matrix allows for easily activating the magneto-mechanicalcouplings under external magnetic actuation. In this regard, we provide a novel approach by setting the magneticactuation below the fully magnetic saturating field. In addition, free deformation tests provide hintson the microstructural transmission of torques from the hard-magnetic particles to the viscoelastic carriermatrix, resulting in macroscopic geometrical effects and complex functional morphological changes.Keywords: Magnetorheological elastomers (MREs), Magneto-mechanics, Experimental characterisation,Hard-magnetics MRE, Multifunctional materials, Magnetic properties
SN 0964-1726
YR 2022
FD 2022-04-25
LK https://hdl.handle.net/10016/35304
UL https://hdl.handle.net/10016/35304
LA eng
NO The authors acknowledge support from the European Research Council (ERC) under the European Union'sHorizon 2020 research and innovation programme (grant agreement No. 947723, project: 4D-BIOMAP).The authors acknowledge support from MCIN/ AEI /10.13039/501100011033 under Grant number PID2020-117894GA-I00. MAMM acknowledges support from the Ministerio de Ciencia, Innovacion y Universidades, Spain (FPU19/03874) and DGG acknowledges support from the Talent Attraction grant (CM 2018- 2018-T2/IND-9992) from the Comunidad de Madrid. MH acknowledges the funding through an EPSRCImpact Acceleration Award (EP/R511614/1).
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RD 18 jul. 2024