THEORETICAL ANALYSIS FOR THE MECHANICAL SPALLATION OF A TYPICAL CHARRING ABLATOR DURING RE-ENTRY,

Abstract

Results are presented for the transient ablation performance of a typical charring ablator for which spallation is responsible for the char removal. The mechanism for the spallation process depends upon the internal stress due to the gas pressure drop through the char and a critical char thickness which is related to the surface shear stress. The environmental conditions considered are representative of a ballistic re-entry trajectory. Detailed calculations of the temperature, gas pressure, material density, porosity, and stress distribution through the material are presented. The effect of the char porosity on the internal stress is shown. In addition, results which demonstrate the effects of increased heating on the char removal and overall ablation performance are presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1963
Accession Number
AD0428046

Entities

People

  • R. D. Mathieu

Organizations

  • General Electric

Tags

DTIC Thesaurus Topics

  • Ablation
  • Ablative Materials
  • Charring
  • Materials
  • Physical Properties
  • Porosity
  • Shear Stresses
  • Spallation
  • Stresses
  • Thickness
  • Trajectories

Readers

  • Materials Science (Mechanical Engineering).
  • Plasma Physics.
  • Snow Cover Descriptors for Reptiles and Their Illustrations.