IMPROVEMENT OF THE USEFULNESS OF PYROLYTIC GRAPHITE IN ROCKET MOTOR APPLICATIONS

Abstract

The effect of the gas dynamics on the uniformity of the pyrolytic graphite deposit was noted. A derivation was completed for the exact stressstrain relations for a material which exhibits the form of elastic and thermal anisotropy found in pyrolytic graphite. The over-all problem of stress- strain in a cylinder of finite length was then set up. The problem was separated into two parts, one dealing with the central portion of the cylinder and other dealing with the end effects. A pyrolytic graphite test piece having a coarse-grained microstructure was successfully tested in a 60-sec firing with Arcite 373 (5600 F) propellant. A segmented nozzle was used in which the test piece was a concentric ring in the throat. The segmented test nozzle was then redesigned to use a larger, contoured section of pyrolytic graphite at the throat. Redesign was necessary for hotter firings (6500 F) since no other grade of graphite is serviceable near the throat section under such demanding conditions.

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1961
Accession Number
AD0263475

Entities

People

  • E. F. Ford
  • E. L. Olcott
  • J. D. Batchelor
  • R. K. White
  • S. W. Mccormick

Organizations

  • ARCO

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Coordinate Systems
  • Elastic Properties
  • Engineering
  • Equations
  • Finishes
  • Gas Dynamics
  • Gas Flow
  • Graphitic Materials
  • Materials
  • Mechanics
  • Rocket Engines
  • Stress Analysis
  • Stress Strain Relations
  • Stresses
  • Thermal Expansion
  • Thermal Stresses

Readers

  • Combustion and Flow Dynamics.
  • Rocket Propulsion.
  • Surface Engineering/Surface Coating Technology.