Magnetorheological Elastomer Stress Relaxation Behaviour during Compression: Experiment and Modelling.

Mateusz Kukla,Krzysztof Talaśka,Dominik Wojtkowiak,Łukasz Warguła

doi:10.3390/ma13214795

Mateusz Kukla, Krzysztof Talaśka + Show 2 more

Open Access

https://doi.org/10.3390/ma13214795

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Journal: Materials	Publication Date: Oct 27, 2020
Citations: 14	License type: CC BY 4.0

Affiliation: Poznań University of Technology

Abstract

Materials characterized by magnetorheological properties are non-classic engineering materials. A significant increase in the interest of the scientific community about this group of materials could be observed over the recent years. The results of research presented in this article are oriented on the examination of the said materials’ mechanical properties. Stress relaxation tests were carried out on cylindrical samples of magnetorheological elastomers loaded with compressive stress, for various values of magnetic induction ( = 0 mT, = 32 mT, = 48 mT, and = 64 mT) and temperature ( = 25 °C, = 30 °C, and = 40 °C). The results of these tests indicate that the stiffness of the examined samples increased along with the increase of magnetic field induction, and decreased along with the increase of temperature. On this basis, it has been determined that: the biggest stress amplitude change, caused by the influence of magnetic field, was = 12.7%, and the biggest stress amplitude change, caused by the influence of temperature, was = 11.3%. As a result of applying a mathematical model, it was indicated that the stress relaxation in the examined magnetorheological elastomer, for the adopted time range ( = 3600 s), had a hyperbolic decline nature. The collected test results point to the examined materials being characterized by extensive rheological properties, which leads to the conclusion that it is necessary to conduct further tests in this area.

Highlights

Magnetorheological elastomers (MRE) are a group of composite materials, the mechanical properties of which change under the influence of an applied magnetic field [1,2]
2018, that elastomers in this temperature range are characterized by a significant loss of mechanical properties, along with temperature increase [22]. The results of both our own tests, and analysis of the available literature, allow us to declare that magnetorheological elastomers are materials with exceptionally complex properties
The further change of properties is related to the influence caused on ferromagnetic particles included in the composite matrix material by magnetic field

Summary

Introduction

Magnetorheological elastomers (MRE) are a group of composite materials, the mechanical properties of which change under the influence of an applied magnetic field [1,2]. This change occurs in a time range counting up to several milliseconds, and is fully reversible [3,4]. They combine materials with various properties: elastic polymers, and metals with good magnetic properties. The most important difference is that magnetic particles in elastomer composites have a very limited ability to move in the matrix [6,7,8]

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