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STUDY OF MECHANICAL PROPERTIES OF SOLID ROCKET PROPELLANT
AEROJET-GENERAL CORP SACRAMENTO CA
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A program of study was initiated to develop methods for optimum grain design. The first phase, concerned improvements in measurement technique leading to better assessment of the binderoxidizer interaction under the multiaxial conditions expected in motors. The second phase, concerned the classification of behavior into several classes characterized by the degree of localization of dewetting with resultant localization of failure. The third phase, was concerned with the suitability of infinitesimal linear theory in predicting stresses and strains reasonable agreement is found up to strains of the order of 10 above which significant dewetting and dilatation occur. The fourth phase, was concerned with the variability of failure behavior and a definite ordering of batches from good to bad appears to be effected by low rate tensile tests at different temperatures or by comparing low rate uniaxial elongations at failure with cracking in small tubular, case-bonded grains. The fifth phase, dealt with selection of a basic point of view the Program Evaluation Research Task PERT system of network analysis appears to offer a suitable basis for study.
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