Erenchun, A. (Aitor)

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    Effect of lubrication on the mechanical behavior of magnetorheological elastomers in compression mode
    (Elsevier, 2022) Kari, L. (Lefi); Gil-Negrete, N. (Nere); Wang, B. (Bochao); Erenchun, A. (Aitor); Blanco, B. (Blas)
    The effect of the lubrication on the mechanical behavior of magnetorheological elastomers (MREs) in compression mode is experimentally studied. According to ISO 7743, there are two procedures to characterize specimens in compression mode. Differences in the properties of these materials between lubricated and non- lubricated conditions must be considered if devices such as vibration absorbers and isolators are to be devel- oped. With lubrication, compression is said to be uniaxial and homogeneous, thus material properties can be obtained. Without lubrication, tests are easier to perform but results are strongly dependent on the piece shape. In this study isotropic and anisotropic MREs with iron particle volume concentrations of 10, 20, 30 and 40% are tested under different strain amplitudes, prestrain and magnetic fields for a frequency range up to 300 Hz, with and without lubrication. Important design parameters like amplitude, frequency and magnetic field dependency are showed to be dependent on lubrication.
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    Practical design of an electromagnet for the compression characterization of magnetorheological elastomers
    (2022) Erenchun, A. (Aitor); Prieto-Rocandio, B. (Borja); Artetxe, G. (Gurutz); Gil-Negrete, N. (Nere)
    In this article, the compression characterization of silicon-based magnetorheological elastomers is addressed, emphasizing the difficulties associated to the test set-up in order to obtain accurate results of the behaviour of the material. Measurement errors associated to friction and vibration coupling due to design flaws in the electromagnet are solved by providing guidelines on an adequate electromagnet layout. The designed electromagnet allows conducting compression dynamic tests up to 300 Hz in specimens of dimensions 40 × 40 × 8 mm3, reaching magnetic flux densities in the order of 1000 mT and showing the expected increase in the dynamic stiffness. Additionally, the electromagnet might be used in the manufacturing and curing of anisotropic magnetorheological compression specimens.