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Magneto-thermo-mechanical characterization of 1–3 type polymer-bonded Terfenol-D composites

Magneto-thermo-mechanical characterization of 1–3 type polymer-bonded Terfenol-D composites,10.1016/S0304-8853(02)01542-1,Journal of Magnetism and Mag

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Magneto-thermo-mechanical characterization of 1–3 type polymer-bonded Terfenol-D composites   (Citations: 14)
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This paper describes magneto-thermo-mechanical test results for 1–3 type magnetostrictive composites incorporating Terfenol-D (Tb0.3Dy0.7Fe2) particulate in an epoxy binder. The purpose of this study is to evaluate the behavior of magnetostrictive composites under combined magnetic, thermal, and mechanical loading, and to determine fundamental properties used for design of sonar transducers that incorporate these materials. Two different tests were performed both at room temperature and under thermal loading: (1) constant magnetic field with cyclically varying mechanical load around a bias load, and (2) constant mechanical pre-load with cyclically varying magnetic field. Testing was performed on five different volume fraction (Vp) composites, namely, 13%, 23%, 31%, 37%, and 50%. Parameters that were evaluated include strain output (ε3) and elastic modulus (E3H). Detailed analysis, including relative permeability (μ33σ/μ0) and the piezo-magnetic coefficient (d33), is only presented for the composite with 50% Vp. Results indicate that composite properties, as pertaining to sonar transducers, are comparable to monolithic Terfenol-D while reducing brittleness, providing higher operational frequencies and easier manufacturability. Moreover, results for composite Terfenol-D can be explained well using theory developed for monolithic Terfenol-D.
Journal: Journal of Magnetism and Magnetic Materials - J MAGN MAGN MATER , vol. 263, no. 1, pp. 101-112, 2003
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    • ...Additional benefits of using these composites are their mechanical durability, tailorable properties, and cost effectiveness [6]–[9]...
    • ...The detailed fabrication process and material properties of this composite can be found from our previous articles [6]–[9]...
    • ...shaped NdFeB permanent magnets, each of 1.0 mm thickness, situated at both ends of the composite tube, is selected to provide an average magnetic bias (or dc) field of 66 kA/m to the composite tube such that the composite tube elongates along its length and produces an optimally large initial static strain [6]–[9]...

    Siu Wing, et al. A 64kHz sandwich transducer fabricated using pseudo 1-3 magnetostricti...

    • ...Epoxy-bonded Terfenol-D particulate composites have demonstrated additional benefits of property-tailorable capability and reduced eddy-current losses, brittleness, and costs [2], [3]...
    • ...The two magnetostrictions, including the one due to the application of a parallel (denoted as ) and the one due to the use of a perpendicular (denoted as ), were measured using a standard strain gauge technique [2]‐[4]...

    Jinjun Liu, et al. Magnetic and Magnetostrictive Properties of Tb Dy Pr (Fe B ) Compounds...

    • ...While these composites have been used in device applications [5], [6], their magnetostrictive properties, in particular the saturation magnetostriction , are limited to 60% of their monolithic material, significantly impeding their commercial viability [7], [8]...

    Ching Yin Lo, et al. Large Magnetostriction in Epoxy-Bonded Terfenol-D Continuous-Fiber Com...

    • ...These built-in residual compressive stresses effectively create a preferred non-180 domain state in the composites as in the case of applying an external prestress to assert an initial non-180 domain state in monolithic Terfenol-D [2], [3]...

    Siu Wing, et al. Dynamic magnetoelastic properties of epoxy-bonded terfenol-D particula...

    • ...Additional studies on Terfenol-D particulate composites have focused on the quasi-static magnetomechanical properties as a function of drive field, stress bias, temperature, elastic modulus of matrix, as well as particle size and volume fraction of Terfenol-D [11]–[18]...
    • ...We have studied the 1–3 type particulate composites since 1995 [13]–[18], [21]–[24]...
    • ...of the mold, causing the particles to align with the magnetic flux lines and producing chains similar to pseudo-fiber composites or, in general, a 1–3 composite (Fig. 2) [13]–[18]...

    Siu Wing, et al. Dynamic magnetomechanical behavior of terfenol-D/epoxy 1-3 particulate...

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