THE COMPRESSIBILITY OF PYROLYTIC GRAPHITE

Abstract

The compressibility of pyrolytic graphite was dynamically measured at pressures up to 0.5 megabar by utilizing explosive-generated shock waves. Shock and free-surface velocities normal and parallel to the original plane of graphite deposition were measured optically. The RankineHugoniot shock wave equations were used to determine the compression points corresponding to the measured velocities. The measurements failed to distinguish statistically between the two major crystal directions in regard to dynamic compressibility characteristics. The measured pressure-volume data for pyrolytic graphite and the results of Alder and Christian on natural graphite differ significantly at pressures above 100 kilobars. Within the range of the present experiments no transition of pyrolytic graphite to diamond was found.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 22, 1963
Accession Number
AD0414415

Entities

People

  • N. L. Coleburn

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Compressive Properties
  • Dynamic Pressure
  • Equations
  • Explosions
  • Explosives
  • Graphitic Materials
  • Impedance
  • Isotherms
  • Maryland
  • Materials
  • Materials Laboratories
  • Munitions
  • Ordnance Laboratories
  • Phase Transformations
  • Physics Laboratories
  • Specific Volume
  • United States

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Computational Modeling and Simulation
  • Thin Film Deposition Science.