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Research Papers

Stress-Strain Behavior of a Smart Magnetostrictive Actuator for a Bone Transport Device

[+] Author and Article Information
Yuehao Luo

Department of Mechanical Engineering, Temple University, 1947 N 12th Street, Philadelphia, PA 19122yuehao@temple.edu

Parsaoran Hutapea1

Department of Mechanical Engineering, Temple University, 1947 N 12th Street, Philadelphia, PA 19122hutapea@temple.edu

1

Corresponding author.

J. Med. Devices 2(4), 041002 (Oct 23, 2008) (8 pages) doi:10.1115/1.2997331 History: Received March 13, 2008; Revised August 14, 2008; Published October 23, 2008

The ultimate goal of our research is to develop a bone transport device using a magnetostrictive alloy actuation system. The device is designed to be subcutaneously mounted on the periosteal surface of the tibia. The magnetomechanical behavior of Terfenol-D smart magnetostrictive material has been well investigated in the literature when a magnetic field is applied along the longitudinal direction of the Terfenol-D material (perpendicular to the material’s magnetic moment). However, the requirement of our device is to have the magnetic field transversely applied on the Terfenol-D material (along the material’s magnetic moment). Therefore, the objective of this work was to study the magnetomechanical behavior of Terfenol-D under a transversely applied magnetic field. Experimental work was performed and a Terfenol-D material constitutive behavior was investigated.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Existing bone transport methods

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Figure 2

(a) A proposed bone transport device using a Terfenol-D actuator and (b)–(e) sketches of the proposed device mechanism under a transversely applied magnetic field

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Figure 3

Analytical and experimental data of the magnetic field measured in the area between the two Neo magnets; the distance was approximated from the average size of child’s legs

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Figure 4

An experimental test setup to study Terfenol-D constitutive behavior under a transverse magnetic field

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Figure 5

Permanent magnets in different positions: (a) Position 0, (b) Position 1, (c) Position 2, and (d) Position 3

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Figure 6

Terfenol-D rod constitutive behavior under a transverse magnetic field at Position 0 (see Fig. 5)

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Figure 7

Terfenol-D rod constitutive behavior under a transverse magnetic field at Position 1 (see Fig. 5)

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Figure 8

Terfenol-D rod constitutive behavior under a transverse magnetic field at Position 2 (see Fig. 5)

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Figure 9

Terfenol-D rod constitutive behavior under a transverse magnetic field at Position 3 (see Fig. 5)

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Figure 10

(a) Crystallographic orientations of Terfenol-D with an applied magnetic field H and (b) domain processes in the [110] plane of single crystal Terfenol-D under the application of a magnetic field H along the [112] axis

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Figure 11

Measured Young’s modulus based on right and left strain gauges at different magnet positions

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