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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 19713–19723

Magnetic field effects on shear and normal stresses in magnetorheological finishing

John C. Lambropoulos, Chunlin Miao, and Stephen D. Jacobs  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 19713-19723 (2010)

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We use a recent experimental technique to measure in situ shear and normal stresses during magnetorheological finishing (MRF) of a borosilicate glass over a range of magnetic fields. At low fields shear stresses increase with magnetic field, but become field-independent at higher magnetic fields. Micromechanical models of formation of magnetic particle chains suggest a complex behavior of magnetorheological (MR) fluids that combines fluid- and solid-like responses. We discuss the hypothesis that, at higher fields, slip occurs between magnetic particle chains and the immersed glass part, while the normal stress is governed by the MRF ribbon elasticity.

© 2010 OSA

OCIS Codes
(160.2750) Materials : Glass and other amorphous materials

ToC Category:
Optical Design and Fabrication

Original Manuscript: June 15, 2010
Revised Manuscript: July 16, 2010
Manuscript Accepted: July 16, 2010
Published: September 1, 2010

John C. Lambropoulos, Chunlin Miao, and Stephen D. Jacobs, "Magnetic field effects on shear and normal stresses in magnetorheological finishing," Opt. Express 18, 19713-19723 (2010)

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  1. C. Miao, S. N. Shafrir, J. C. Lambropoulos, J. Mici, and S. D. Jacobs, “Shear stress in magnetorheological finishing for glasses,” Appl. Opt. 48(13), 2585–2594 (2009). [CrossRef] [PubMed]
  2. C. Miao, “Frictional forces in material removal for glasses and ceramics using magnetorheological finishing,” Ph.D dissertation (University of Rochester, Rochester, NY, 2010).
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  5. Zygo Mark IVxp interferometer, Zygo Corp., CT. This instrument is a four inch HeNe Fizeau interferometer with a wavelength of 632.8 nm. Peak-to-valley (pv) for surface flatness and depth of deepest penetration (ddp) of the spot was measured in microns. The spot is expected to be less than 0.2 μm deep for achieving a good measurement, and spotting time was adjusted to stay below this upper limit.
  6. Zygo New View 5000 noncontacting white light interferometer, Zygo Corp., CT. The surface roughness data were obtained under the following conditions: 20 × Mirau; high FDA Res.; 20 μm bipolar scan length; Min/Mod: 5%, unfiltered.
  7. J. E. De Groote, A. E. Marino, J. P. Wilson, A. L. Bishop, J. C. Lambropoulos, and S. D. Jacobs, “Removal rate model for magnetorheological finishing of glass,” Appl. Opt. 46(32), 7927–7941 (2007). [CrossRef]
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  11. J. M. Ginder and L. C. Davis, “Shear stresses in magnetorheological fluids: Role of magnetic saturation,” Appl. Phys. Lett. 65(26), 3410–3412 (1994). [CrossRef]

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