Accession Number:

ADB001669

Title:

Aluminum Hydride Propellant Shelflife

Descriptive Note:

Final rept. Dec 1970-Jul 1974

Corporate Author:

LOCKHEED PROPULSION CO REDLANDS CA

Personal Author(s):

Report Date:

1974-11-01

Pagination or Media Count:

87.0

Abstract:

The thermal stability and service life capability of an A1HTVOPA and PCDE based propellants were evaluated relying upon accelerated surveillance tests accompanied by X-ray analyses, off-gas analyses, tensile testing and determination of creep failure distributions. The Halpin statistical cumulative damage analysis principle was implemented for interpreting the creep failure test data. Catalytic gas scavengers were shown to extend the 20C shelflife of A1HTVOPA propellants to better than 3 years. However, difficulties in assuring close batch-to-batch reproducibility, and noticeable binder degradation at storage temperatures in excess of 20C cause this propellant to be of questionable merit in military application. A ballistically optimized PCDE propellant failed within relatively short storage times at moderate temperatures, and the rather premature failure was attributed to a combination of internal gassing and binder polymer degradation. Both deficiencies appear to be associated with residual impurities, or structural irregularities in the prepolymer, and the problem is expected to be overcome by further material development. The Halpin statistical cumulative damage analysis approach, which was used to analyze and interpret the creep failure data, was shown to be applicable for assessing the effects of chemical aging upon creep failure distributions and to provide a means for predicting propellant-in-motor service life under given time-temperature-load conditions.

Subject Categories:

  • Solid Rocket Propellants

Distribution Statement:

APPROVED FOR PUBLIC RELEASE