Measurement of Thermal Expansion in Solid Propellants
[Technical Report, Interim Report]
AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CA
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An analysis was performed to determine the sensitivity of solid rocket motor stress Strain analyses to a variation in thermal coefficient of linear expansion TCLE. For the wide range of TCLE values currently utilized in the propellant industry, the stress analysis predicted an approximately 60 percent change in the maximum inner bore strain. A laser holograph technique was therefore devised to more accurately measure propellant TCLE. The interferometric holographic technique provided an accurate resolution in the microinches means of measuring linear thermal expansion for small temperatures variations 1.0 to 3.6 deg F. Irregularities resulted in the interference fringes when the temperature change was greater than 4.0 deg F. For the limited data taken, measured TCLE values were well within the currently acceptable range, but this initial effort did not narrow this range appreciably.
- Solid Rocket Propellants