Development of highly magnetostrictive composites for applications in magnetomechanical torque sensors

dc.contributor.advisor David C. Jiles
dc.contributor.author Chen, Yonghua
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-23T03:02:26.000
dc.date.accessioned 2020-06-30T07:21:01Z
dc.date.available 2020-06-30T07:21:01Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1999
dc.date.issued 1999
dc.description.abstract <p>The objective of this work was to investigate and develop a new type of magnetomechanical material with high magnetomechanical response and low hysteresis. This material will be used in electronic torque sensors. A major appreciation could be for advanced steering systems in automobiles which will replace the fuel inefficient hydraulic steering systems currently in use;The effect of the matrix material on the magnetostriction of composites containing highly magnetostrictive particles was studied. Both experimental and modeled results showed that the elastic modulus of the matrix is an important factor determining the magnetostriction of the composite. For a series of composites with the same volume fraction of Terfenol-D particles but different matrix materials, the saturation magnetostriction was found to increase systematically with decreasing modulus of the matrix;A magnetic torque sensor test bed was developed as part of the present investigation. This instrumentation was used to make the magnetomechanical measurements under torsional stress. After investigating both of the H-sigma processes and sigma-H processes of metal rods (Fe, Co, Ni), it was shown that a high piezomagnetic coefficient, together with a high saturation magnetostriction are two "figures of merit" for choosing materials for magnetomechanical sensors;A new class of materials, metal-bonded (Ag/Ni/Co) Co-ferrite composites, has been found to be better than the traditional magnetostrictive materials for this application. These materials exhibited magnetostriction in excess of 200 ppm and a d33 Coefficient, 1.3 x 10--9 A--1m. A prototype of torque sensor was constructed from this material. The sensitivity of surface magnetic field to applied torque as high as 65 AN--1m--2 in the torque range of +/-10N·m was observed. The temperature dependence of the magnetomechanical sensitivity and hysteresis were measured over the range --37 to 90°C. Both decreased as the temperature increased throughout the entire range. The magnetomechanical hysteresis became negligible at temperatures higher than 60°C, above which it gave a linear magnetic field change in response to torque;The magnetomechanical effect under torque was modeled with an extension of the existing uniaxial model of the magnetomechanical effect. The modeled results show similar behavior to the experimental results and give quantitatively realistic values of sensitivity and hysteresis.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/12445/
dc.identifier.articleid 13444
dc.identifier.contextkey 6804121
dc.identifier.doi https://doi.org/10.31274/rtd-180813-13714
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/12445
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/65814
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/12445/r_9950081.pdf|||Fri Jan 14 19:21:48 UTC 2022
dc.subject.disciplines Electromagnetics and Photonics
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.disciplines Physics
dc.subject.keywords Materials science and engineering
dc.title Development of highly magnetostrictive composites for applications in magnetomechanical torque sensors
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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