摘要：

Uniaxial tensile tests of different composite solid rocket propellant compositions, based on hydroxyl-terminated polybutadiene (HTPB), have shown that mechanical properties extensively change after curing, up to 100% of their initial values, during the first few months. Then, they stabilize and start to return slowly in the reverse direction. Careful measurements of these features are necessary in order to control production quality of the propellant and for comparison of different propellant compositions or batches. Furthermore, time distributions of the mechanical properties in the initial period after production and short-time aging should not be neglected, because they strongly affect propellant grain structural analysis and correct estimation of rocket motor reliability.

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