AN ANALYSIS OF THE STRESS CONDITIONS THAT COULD DEVELOP IN A SOLID FUEL ROCKET MOTOR.
AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
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The major objective of this project is to investigate the thermal stresses developed in models which simulate the forward end of a solid propellant rocket motor. The first approximation, made to partially simulate the configuration of the forward end of the propellant grain, consisted of a hollow cylinder bonded at one end to a flat plate. This essembly was subjected to a uniform temperature change. Both the theoretical and experimental stresses were determined for this configuration. Very little information was initially available concerning the material properties of the model material which was used. Therefore, material properties, were determined experimentally prior to the investigation of the stresses in the model. Exploratory investigations of various bonding techniques and model casting techniques were made. This was necessary because of the absence of available information in these areas. Both two and three dimensional photoelastic stress analyses were employed during the experimental investigations. A model more nearly simulating the forward end of the solid propellant grain was cast, and a three dimensional photoelastic stress analysis was made. A theoretical analysis using a high speed digital computer was also made. A preliminary investigation concerned with the use of strain gages embedded in the model, simulating the propellant grain, was made. Author