Effects of soft and hard magnetic particles on the mechanical performance of ultra-soft magnetorheological elastomers
Moreno Mateos MA, Lopez-Donaire ML, Mokarram H, Garcia-Gonzalez D (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 31
Article Number: 065018
Journal Issue: 6
Abstract
Magnetorheological elastomers (MREs) mechanically respond to external magnetic stimuli by changing their mechanical properties and/or changing their shape. Recent studies have shown the great potential of MREs when manufactured with an extremely soft matrix and soft-magnetic particles. Under the application of an external magnetic field, such MREs present significant mechanical stiffening, and when the magnetic field is off, they show a softer response, being these alternative states fully reversible. Although soft-magnetic particles are suitable for their high magnetic susceptibility, they require the magnetic actuation to remain constant in order to achieve the magneto-mechanical stiffening. Here, we present an alternative solution based on hard-magnetic MREs to provide stiffening responses that can be sustained along time without the need of keeping the external magnetic field on. To this end, we manufacture novel extremely soft hard-magnetic MREs (stiffness in the order of 1 kPa) and characterise them under magneto-mechanical shear and confined magnetic expansion deformation modes, providing a comparison framework with the soft-magnetic counterparts. The extremely soft nature of the matrix allows for easily activating the magneto-mechanical couplings under external magnetic actuation. In this regard, we provide a novel approach by setting the magnetic actuation below the fully magnetic saturating field. In addition, free deformation tests provide hints on the microstructural transmission of torques from the hard-magnetic particles to the viscoelastic matrix, resulting in macroscopic geometrical effects and intricate shape-morphing phenomena.
Authors with CRIS profile
Miguel Moreno Mateos
Lehrstuhl für Technische Mechanik
Hossain Mokarram
Lehrstuhl für Technische Mechanik
Involved external institutions
Spain (ES)How to cite
APA:
Moreno Mateos, M.A., Lopez-Donaire, M.L., Mokarram, H., & Garcia-Gonzalez, D. (2022). Effects of soft and hard magnetic particles on the mechanical performance of ultra-soft magnetorheological elastomers. Smart Materials and Structures, 31(6). https://dx.doi.org/10.1088/1361-665X/ac6bd3
MLA:
Moreno Mateos, Miguel Angel, et al. "Effects of soft and hard magnetic particles on the mechanical performance of ultra-soft magnetorheological elastomers." Smart Materials and Structures 31.6 (2022).
BibTeX: Download