Accession Number : AD0885637

Title :   Grain Integrity Evaluation of the Thiokol TE-M-521 Solid Motor.

Descriptive Note : Technical operating rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA ENGINEERING SCIENCE OPERATIONS

Personal Author(s) : Stampfl, E.

Report Date : 20 NOV 1970

Pagination or Media Count : 33

Abstract : A finite element elastic grain analysis, combined with a viscoelastic analysis of the Thiokol TE-M-521 motor, was performed. Based on mean uniaxial allowables which in part were estimated, a 29-month-old motor when tested at 70F had a positive 45-percent margin. However, the uncertainties associated with extrapolated low strain rate allowables, accelerated chemical aging degradations, and properties predict a failure. The damage incurred by a new mean motor when cooled to 0F and tested is also determined. Assuming a 25-percent degradation in the uniaxial thermal strain allowables due to biaxial degradation, a mean motor when tested at 0F is predicted to crack in the bore. The available aged flight motors are probably not flightworthy. (Author)

Descriptors :   (*ROCKET PROPELLANT GRAINS, DEGRADATION), (*SOLID PROPELLANT ROCKET ENGINES, ROCKET PROPELLANT GRAINS), AGING(MATERIALS), STRESSES, INTERIOR BALLISTICS, STRAIN(MECHANICS), CRACKS, MATHEMATICAL MODELS.

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE