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Proceedings Paper

Magnetoelastic vibration damping properties of TbDy alloys
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Paper Abstract

Damping of axial and bending mode vibrations in giant magnetoelastic polycrystalline TbDy alloys was studied at cryogenic temperatures. All specimens of TbDy were arc-melted in the proper composition ratio and dropped into a chilled copper mold. Additional treatments consisted of cold plane-rolling to induce crystallographic texture and then heat-treating to relieve internal stress. Mechanical hysteretic losses were measured at various strains, frequencies, and loading configurations down to 77 K. Both as-cast and textured polycrystalline TbDy samples were tested along with an aluminum specimen for comparison. Loss factors at multiple natural vibration frequencies of the samples were measured for axial modes. Larger damping rates were measured for axial mode vibrations than for bending mode vibrations, possibly reflecting the larger specimen volume contributing to magnetoelastic damping. At LN2 temperatures TbDy materials demonstrated η > 0.05 at 0.01 Hz and η > 0.1 at higher frequencies from 0.6-1.5 kHz.

Paper Details

Date Published: 11 March 2003
PDF: 10 pages
Proc. SPIE 4946, Transducing Materials and Devices, (11 March 2003); doi: 10.1117/12.468377
Show Author Affiliations
Jennifer A. Dooley, Jet Propulsion Lab. (United States)
Nathan R. Good, Jet Propulsion Lab. (United States)
Christopher V. White, Jet Propulsion Lab. (United States)
Robert S Leland, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4946:
Transducing Materials and Devices
Yoseph Bar-Cohen, Editor(s)

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