Dislocation accumulation at large plastic strains -- An approach to the theoretical strength of materials

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Description

The usual method of introducing engineers to the concept of dislocations and their role in plastic flow is to compare an estimate of the theoretical strength of solid (of order {micro}/30 where {micro} is the shear modulus) and the observed strength of either single crystals ({mu}/10{sup 4}) or practical engineering material such as structural steels where the yield stress in shear is of order {mu}/10{sup 3}. However, if one considers the problem in reverse, one can consider the accumulation of dislocations as an important mechanism by which one can produce engineering materials in which the strength level approaches the theoretical ... continued below

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32 p.

Creation Information

Embury, J.D. & Han, K. April 1, 1999.

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This report 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. It has been viewed 19 times . More information about this report can be viewed below.

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  • Embury, J.D. Los Alamos National Lab., NM (United States)
  • Han, K. Los Alamos National Lab., NM (United States)

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Description

The usual method of introducing engineers to the concept of dislocations and their role in plastic flow is to compare an estimate of the theoretical strength of solid (of order {micro}/30 where {micro} is the shear modulus) and the observed strength of either single crystals ({mu}/10{sup 4}) or practical engineering material such as structural steels where the yield stress in shear is of order {mu}/10{sup 3}. However, if one considers the problem in reverse, one can consider the accumulation of dislocations as an important mechanism by which one can produce engineering materials in which the strength level approaches the theoretical strength. If one assumes that the flow stress can be expressed in terms of te mean free path between stored dislocations or as the square root of the global dislocation density, then one can see the influence of dislocation density in a diagrammatic form. It is clear that the strengthening by dislocation accumulation due to large imposed plastic strains represents an important approach both to the development of new, potentially valuable, engineering materials and an important area of basic understanding in terms of the mechanical response of materials close to their theoretical strength. Thus, this article will survey some of the factors which influence dislocation accumulation at large strains and the consequences of such accumulation processes.

Physical Description

32 p.

Notes

OSTI as DE99002412

Source

  • Mechanical behaviors of materials, Victoria (Canada), May 1999

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  • Other: DE99002412
  • Report No.: LA-UR--99-750
  • Report No.: CONF-990506--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/334207 | External Link
  • Office of Scientific & Technical Information Report Number: 334207
  • Archival Resource Key: ark:/67531/metadc677623

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Creation Date

  • April 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 8:54 p.m.

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Embury, J.D. & Han, K. Dislocation accumulation at large plastic strains -- An approach to the theoretical strength of materials, report, April 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc677623/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.