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Measurements on the Temperature, Dynamic Strain Amplitude and Magnetic Field Strength Dependence of the Dynamic Shear Modulus of Magnetosensitive Elastomers in a Wide Frequency Range

[+] Author and Article Information
Jonas Lejon

e-mail: jole02@kth.se

Leif Kari

e-mail: leifkari@kth.se
KTH Royal Institute of Technology,
The Marcus Wallenberg Laboratory
for Sound and Vibration Research,
Stockholm 100 44, Sweden

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received June 12, 2012; final manuscript received July 13, 2013; published online August 6, 2013. Assoc. Editor: Jiong Tang.

J. Vib. Acoust 135(6), 064506 (Aug 06, 2013) (6 pages) Paper No: VIB-12-1176; doi: 10.1115/1.4025063 History: Received June 12, 2012; Revised July 13, 2013

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.

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Figures

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Fig. 9

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0015 and a 0.3 T magnetic field for seven temperatures

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Fig. 2

Inside the insulated box. The black circles are the positions of the thermocouples.

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Fig. 1

The measurement setup

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Fig. 3

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.005 at room temperature (293 K) for four magnetic fields

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Fig. 4

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0015 at 320 K for four magnetic fields

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Fig. 5

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0005 at 273 K for four magnetic fields

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Fig. 6

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0005 at 254 K for four magnetic fields

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Fig. 7

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0005 at 242 K for four magnetic fields

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Fig. 8

The magnitude and loss factor of the dynamic shear modulus at a dynamic strain amplitude of 0.0005 and no magnetic field for seven temperatures

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