NASA NTRS · 19730000130
Monitor for physical property changes in solid propellants
Abstract
Specially designed sensor is attached to or imbedded in propellant. When sensor is driven into vibration, it moves with a phase lag directly proportional to internal friction or loss coefficent. Resonance frequency of the system is related to Young's modulus. Modulus or internal friction can be monitored over long period of time.
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Black, R. E., Jr.. 1973-03-01. Monitor for physical property changes in solid propellants. https://ntrs.nasa.gov/citations/19730000130
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