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Force and Torque Sensing with Galfenol Alloys

Mahadevan, Arjun
http://rave.ohiolink.edu/etdc/view?acc_num=osu1259727083

Abstract Details

2009, Master of Science, Ohio State University, Mechanical Engineering.
Galfenol is a class of smart material that combines moderate magnetostriction (upto 400 ppm) and excellent mechanical strength. In this work two <100> oriented highly textured polycrystalline Galfenol alloys with different Gallium (Ga) content have been characterized. The two alloys have been studied under tensile and compressive loads. Magnetization versus field measurements are presented for the two alloys at different bias stresses ranging from -63.71 MPa to 63.71 MPa. The magnetization versus applied stress measurements are presented for the two alloys at different bias fields. The stress-dependent magnetic susceptibility change of these alloys has been studied; the susceptibility of the higher concentration Ga alloy is more sensitive to stress in the domain rotation region of the magnetization process and operates over a larger stress range, whereas the low Ga concentration sample is more sensitive in the domain wall motion region. The stress-dependent susceptibility change of these alloys can be used to develop a force sensor or a torque sensor. A force sensor which utilizes the principle of stress-dependent susceptibility is demonstrated. The stress range for a force sensor using the two alloys is determined. The same principle can be used to measure the torque in a non-contact way by bonding rolled Galfenol steel on a shaft.The principle is demonstrated by measuring the change in susceptibility that occurs when a rolled Galfenol patch bonded on a non-magnetic substrate is stressed.
Marcelo Dapino (Advisor)
Stephen Bechtel (Committee Member)
111 p.
Mechanical Engineering
Galfenol; Magnetostriction; Susceptibility; Force Sensor; Torque Sensor

Recommended Citations

Citations

  • Mahadevan, A. (2009). Force and Torque Sensing with Galfenol Alloys [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259727083

    APA Style (7th edition)

  • Mahadevan, Arjun. Force and Torque Sensing with Galfenol Alloys. 2009. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1259727083.

    MLA Style (8th edition)

  • Mahadevan, Arjun. "Force and Torque Sensing with Galfenol Alloys." Master's thesis, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259727083

    Chicago Manual of Style (17th edition)

osu1259727083
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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.