SOLID PROPELLANT MECHANICAL PROPERTIES INVESTIGATIONS.
Quarterly progress rept. no. 1 (Rept. no. 3), 1 Oct 63-1 Jan 64,
STANFORD RESEARCH INST MENLO PARK CALIF
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Progress was made toward the development of a method for defining the path-independent physical state of a propellant in terms of stress-strain-time history. The applicability of an equation of state to constant strain rate and constant load test results is demonstrated by comparison of calculated and experimental test data at three temperatures. The air dilatometer was modified to extend the range of loads available for constant load testing, to provide the added capability for recovery at zero load, and to carry out constant loading rate tests. Two model systems for future study were formulated both were based on the carboxy-terminated polybutadiene binder used in the propellants, with glass beads or aluminum powder used as filler. Preliminary tests under conditions of constant loading rate, constant strain rate cycling, and constant load recovery were undertaken and results are reported. Author