The Effect of Crystal Orientation on Growth on Polycrystalline TNT,

Abstract

Dimensional instability of polycrystalline TNT depends markedly on crystal orientation within the specimen. Growth or irreversible expansion on thermal cycling is large in a particular direction if there is a 'texture' of crystals with high and low coefficients of thermal expansion in that direction which interact to produce large intercrystalline stresses. Growth is smaller when the crystals are so arranged that there are no such interactions and the intercrystalline stresses generated in that direction are small. Creamed TNT with its random crystal orientation generates equal intercrystalline stresses in all directions on thermal cycling, and growth is consequently equal in all directions. These results are consistent with the 'ratchet' mechanism proposed previously to account for growth in polycrystalline TNT. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA096591

Entities

People

  • William S. Wilson

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Australia
  • Coefficients
  • Critical Temperature
  • Crystal Structure
  • Crystals
  • Engineering
  • Explosives
  • Grain Boundaries
  • Grain Size
  • Instability
  • Mass Transfer
  • Materials
  • Materials Testing
  • Orientation (Direction)
  • Polycrystals
  • Security
  • Thermal Expansion

Readers

  • Explosive Engineering.
  • Materials Science and Engineering.