Shock Wave Induced Structural Phase Transformations.

Abstract

Shock induced structural phase transformations, for two military motivated problems, are considered. Structural transformations in metallic alloys (e.g. TiNi) are examined from both macroscopic and microscopic (soft phonon mode) viewpoints. Both viewpoints are found to be consistent with the possibility of growth (avalanching) of the amplitude of a transformation inducing propagating shock wave. The relationship between such avalanching and the design considerations for an optically activated detonator is treated. The thermomechanics of the alpha to epsilon transition in iron (130 kilobars) is examined for the case where that transition is induced by a shock in the presence of an external magnetic field. Magnetostriction effects are included in the analysis. It is concluded that solid state physics relevant to the alpha to epsilon transition could be important to materials selection for armor. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1976
Accession Number
ADA038252

Entities

People

  • Paul Harris

Organizations

  • Picatinny Arsenal

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Critical Temperature
  • Crystal Lattices
  • Crystal Structure
  • Equations
  • Equations Of State
  • Explosives
  • Frequency
  • Heat Energy
  • Latent Heat
  • Magnetic Fields
  • Materials
  • Mechanical Properties
  • Mechanics
  • Phase Transformations
  • Solid State Physics
  • Thermodynamics
  • Transition Temperature

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Materials Science and Engineering.
  • Theoretical Analysis.