Accession Number : AD0428046

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

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Mathieu,R. D.

Report Date : DEC 1963

Pagination or Media Count : 1

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)

Descriptors :   (*ABLATION, SPALLATION), (*SPALLATION, ABLATION), (*REENTRY VEHICLES, ABLATION), GAS FLOW, PYROLYSIS, THERMAL INSULATION, POROSITY, STRESSES, DEGRADATION, DIFFERENTIAL EQUATIONS, INTEGRAL EQUATIONS, SURFACE PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE