Benchtop magnetostriction measurements

Garshelis, Ivan J.; Jones, Christopher A.; Rigsbee, D.K.; Cripe, D.W.

doi:10.1109/20.908931

Cited by 2 publications

(2 citation statements)

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“…More recently, Rotter 7 et al have constructed a capacitance dilatometer cell, based on a tilted plate principle that requires numerical solutions of the capacitance equations, that when combined with a capacitance bridge circuit allows for high precision magnetostriction measurements in tiny single crystals. Additionally, Garshelis 8 has adapted the two-oscillator method to perform a more simplistic bench-top magnetostriction measurement on polycrystalline steel alloys.…”

Section: Introductionmentioning

confidence: 99%

“…However, persistent difficulties with electronic circuit performance, oscillator calibration, and reproducibility of results in the latter case, 8 as well as the complexity of numerical analysis and the nonexistence of single crystalline samples for such steel alloys in the former case, 7 have prompted the development of a greatly simplified method utilizing standard laboratory equipment, but in a quite unconventional manner, for the purposes of ranking polycrystalline materials by their magnetostriction levels. Unfortunately, magnetostriction measurements in polycrystalline samples will likely not relate to one another in a linear, predictable manner, since it is nearly impossible to assume an initially isotropic arrangement of the domain structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Capacitance bridge measurements of magnetostriction

Boley

Shin

Rigsbee

et al. 2002

Journal of Applied Physics

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Magnetostriction effects were investigated for three different materials by using a simple, reproducible, and cost-effective method recently developed in our laboratory. The magnetostriction effects were generated by a large oscillating magnetic field produced by a high current 60 Hz ac welder power supply, capable of reaching saturation levels for the material, and then detected by a change in capacitance between a hollow cylindrical sample and a concentric brass ring. This capacitance change was continuously monitored at a high frequency rate by a standard laboratory capacitance bridge meter. The output voltage of the bridge was fed into a storage cathode-ray oscilloscope and its voltage versus time signals were then analyzed by a computer program. Two ferromagnetic rings, constructed of high-speed steels 4620 and 4340, which have proven applicability for use in magnetoelastic torque sensing, were used as the samples for investigating the magnetostriction effects, while a paramagnetic aluminum ring was used for the control sample. Our study showed that the 4340 ring, which had higher nickel, cobalt, and chromium content than that of the 4620 ring, had the largest magnetostriction effect, and that the aluminum ring displayed no magnetostriction effect, as was expected. We have found this experimental method to be both reproducible and sufficient to rank different ferromagnetic materials by their magnetostriction level, which is a significant consideration in producing effective magnetoelastic torque sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%