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Transient Response of Macroscopic Deformation of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

  • Significant deformations of bodies made from compliant magnetoactive elastomers (MAE) in magnetic fields make these materials promising for applications in magnetically controlled actuators for soft robotics. Reported experimental research in this context was devoted to the behaviour in the quasi-static magnetic field, but the transient dynamics are of great practical importance. This paper presents an experimental study of the transient response of apparent longitudinal and transverse strains of a family of isotropic and anisotropic MAE cylinders with six different aspect ratios in time-varying uniform magnetic fields. The time dependence of the magnetic field has a trapezoidal form, where the rate of both legs is varied between 52 and 757 kA/(s·m) and the maximum magnetic field takes three values between 153 and 505 kA/m. It is proposed to introduce four characteristic times: two for the delay of the transient response during increasing and decreasing magnetic field, as well as two for rise and fall times. To facilitate the comparison between different magnetic field rates, these characteristic times are further normalized on the rise time of the magnetic field ramp. The dependence of the normalized characteristic times on the aspect ratio, the magnetic field slew rate, maximum magnetic field values, initial internal structure (isotropic versus anisotropic specimens) and weight fraction of the soft-magnetic filler are obtained and discussed in detail. The normalized magnetostrictive hysteresis loop is introduced, and used to explain why the normalized delay times vary with changing experimental parameters.

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Metadaten
Author:Gašper Glavan, Inna Belyaeva, Mikhail Shamonin (Chamonine)ORCiDGND
URN:urn:nbn:de:bvb:898-opus4-71067
DOI:https://doi.org/10.3390/polym16050586
ISSN:2073-4360
Parent Title (English):Polymers
Publisher:MDPI
Place of publication:Basel, Schweiz
Document Type:Article
Language:English
Year of first Publication:2024
Publishing Institution:Ostbayerische Technische Hochschule Regensburg
Release Date:2024/03/18
Tag:macroscopic deformation; magnetoactive elastomer; magnetorheological elastomer; magnetostriction; time-varying magnetic field
Volume:16
Issue:5, Special Issue Magnetic Polymer Composites: Design and Application II
Article Number:586
Pagenumber:17
Note:
Corresponding author der OTH Regensburg: Gašper Glavan
Institutes:Fakultät Elektro- und Informationstechnik
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International