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  • 1.
    Lejon, Jonas
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    On the frequency, dynamic strain amplitude, prestrain, temperature and magnetic field strength dependence of magneto-sensitive elastomers2012Doctoral thesis, comprehensive summary (Other academic)
  • 2.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    A non-linear wide frequency model of the dynamic shear modulus dependence on temperature, prestrain, dynamic strain amplitude and magnetic field for magneto-sensitive rubberIn: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568Article in journal (Other academic)
  • 3.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    An experimental study in the audible frequency range of the prestrain, dynamic strain amplitude, frequency and magnetic field strength dependence of magneto-sensitive rubberIn: Kautschuk und Gummi, Kunststoffe, ISSN 0022-9520Article in journal (Other academic)
  • 4.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    An experimental study of the frequency-dependent behaviour of magneto-sensitive rubber with respect to preload, vibrational amplitude and magnetic field strength2008Conference paper (Other academic)
  • 5.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Investigation in the audible Frequency Range of magneto-sensitive Rubber2012In: KGK Kautschuk Gummi Kunststoffe, ISSN 0948-3276, Vol. 65, no 10, p. 31-35Article in journal (Refereed)
    Abstract [en]

    An experimental study is conducted where the prestrain dependence of magneto-sensitive rubber in the audible frequency range is studied along with the dependence of the dynamic strain amplitude, frequency and magnetic field strength. The material is natural rubber with a 33% volume particle fraction of irregularly shaped iron metal particles. The results show that with an increase in prestrain up to 1, the magnitude of the dynamic shear modulus decreases. As the prestrain further increases the rate of decrease of the magnitude subsides, indicating that the material is starting to stiffen. Furthermore, an attenuation of the magneto-sensitivity with increased prestrain is noted. As the frequency and magnetic field strengths are increased, the material stiffens. However, it softens with increased dynamic strain amplitude. The results presented here indicate that the pre-strain is an important parameter to consider when describing magneto-sensitive materials.

  • 6.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Magneto-sensitive rubber: An experimental inquiry into its dependence on frequency, preload, vibration amplitude and magnetic field strength2008Conference paper (Other academic)
  • 7.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Measurements on the Temperature, Dynamic Strain Amplitude and Magnetic Field Strength Dependence of the Dynamic Shear Modulus of Magnetosensitive Elastomers in a Wide Frequency Range2013In: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, E-ISSN 1528-8927, Vol. 135, no 6, p. 064506-Article in journal (Refereed)
    Abstract [en]

    A measurement study is conducted to investigate how changes in temperature, dynamic strain amplitude, and magnetic field strength influence the behavior of a magnetosensitive material. During the measurements seven temperatures, four magnetic fields, and three dynamic strain amplitudes are used over a 200 to 800 Hz frequency range. The results indicate a decrease in shear modulus magnitude as the dynamic strain amplitude is increased. As the frequency and magnetic field strength increases the magnitude increases. However, the measurements indicate that the temperature is the most influential of the parameters as the material stiffens significantly when the temperature reaches the transition phase. Understanding the temperature dependence increases the knowledge of magnetosensitive materials.

  • 8.
    Lejon, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Kari, Leif
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
    Preload, frequency, vibrational amplitude and magnetic field strength dependence of magnetosensitive rubber2009In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 38, no 8, p. 321-326Article in journal (Refereed)
    Abstract [en]

    The preload dependence of magnetosensitive rubber is experimentally studied along with the influence of frequency, vibrational amplitude and magnetic field strength. The material studied is an iron particle filled natural rubber with a volume particle fraction of 33%, which is close to the optimal particle concentration. The results of the measurements show that an increased preload decreases the influence of magnetic field strength and they also suggest that an increase in the magnetic field reduces the influence of the preload. Measurements of the magnitude of the dynamic shear modulus also display a preload dependence. These results imply that in a description of these materials, the preload should be taken into account, especially since magnetosensitive elastomers are used in applications where they are often exposed to preloads.

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