Compaction Stress in Fine Powders

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Description

A vexing feature in granular materials compaction is density extrema interior to a compacted shape. Such inhomogeneities can lead to weaknesses and loss of dimensional control in ceramic parts, unpredictable dissolution of pharmaceuticals, and undesirable stress concentration in load-bearing soil. As an example, the centerline density in a cylindrical compact often does not decrease monotonically from the pressure source but exhibits local maxima and minima. Two lines of thought in the literature predict, respectively, diffusive and wavelike propagation of stress. Here, a general memory function approach has been formulated that unifies these previous treatments as special cases; by analyzing a ... continued below

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9 p.

Creation Information

Hurd, A.J.; Kenkre, V.M.; Pease, E.A. & Scott, J.E. April 1, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Description

A vexing feature in granular materials compaction is density extrema interior to a compacted shape. Such inhomogeneities can lead to weaknesses and loss of dimensional control in ceramic parts, unpredictable dissolution of pharmaceuticals, and undesirable stress concentration in load-bearing soil. As an example, the centerline density in a cylindrical compact often does not decrease monotonically from the pressure source but exhibits local maxima and minima. Two lines of thought in the literature predict, respectively, diffusive and wavelike propagation of stress. Here, a general memory function approach has been formulated that unifies these previous treatments as special cases; by analyzing a convenient intermediate case, the telegrapher's equation, one sees that local density maxima arise via semidiffusive stress waves reflecting from the die walls and adding constructively at the centerline.

Physical Description

9 p.

Notes

OSTI as DE00005677

Medium: P; Size: 9 pages

Source

  • Materials Research Society Spring Meeting, San Francisco, CA (US), 04/04/1999--04/09/1999

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  • Report No.: SAND98-2703C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 5677
  • Archival Resource Key: ark:/67531/metadc695780

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  • April 1, 1999

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 11, 2017, 7:31 p.m.

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Hurd, A.J.; Kenkre, V.M.; Pease, E.A. & Scott, J.E. Compaction Stress in Fine Powders, article, April 1, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc695780/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.