Abstract
This paper describes an experimental investigation conducted on magneto-rheological elastomers (MREs) with the aim of adopting these materials to make mounts to be used as vibration isolators. These materials, consisting of an elastomeric matrix containing ferromagnetic particles, are considered to be smart materials, as it is possible to control their mechanical properties by means of an applied magnetic field. In the first part of the paper, the criteria adopted to define the characteristics of the material and the experimental procedures for making samples are described. The samples are subjected to a compressive static test and are then, adopting a testing machine specially configured, tested for shear periodic loads, each characterized by a different constant compressive preload. The testing machine is equipped with a coil, with which it is possible to vary the intensity of the magnetic field crossing the sample during testing to evaluate the magneto-rheological effect on the materials’ characteristics in terms of stiffness and damping.
Highlights
Magneto-rheological elastomers (MREs) are capable of changing their stiffness and damping in response to an applied magnetic field [1,2]
Stiff; for thissamples reason, our experiments were carriedaout on silicone samples. These were prepared by adopting nylon mold that allowed us to place permanent. These samples were prepared by adopting a nylon mold that allowed us to place permanent magnets at its extremities so that, during the polymerization phase, the iron-carbonyl particles mixed magnets at its extremities so that, during the polymerization phase, the iron-carbonyl particles mixed with the liquid silicone, aligning along the strength lines of the magnetic field and forming with the liquid silicone,structures aligning along the strength lines of theupon magnetic fieldcure
6 of the material properties, the sample was tested by means of an experimental setup containing a coil that produces a magnetic field whose strength lines are parallel to the particle columns of the MRE material
Summary
Magneto-rheological elastomers (MREs) are capable of changing their stiffness and damping in response to an applied magnetic field [1,2]. This characteristic allows for the development of controllable devices for vibration isolation [3,4], overcoming the limits of traditional passive isolators. Stiff; for thissamples reason, our experiments were carriedaout on silicone samples These samples were prepared by adopting a nylon mold that allowed us to place permanent magnets at its extremities so that, during the polymerization phase, the iron-carbonyl particles mixed magnets at its extremities so that, during the polymerization phase, the iron-carbonyl particles mixed with the liquid silicone, aligning along the strength lines of the magnetic field and forming with the liquid silicone,structures aligning along the strength lines of theupon magnetic fieldcure.
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