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A RESEARCH STUDY TO ADVANCE THE STATE-OF-THE-ART OF SOLID PROPELLANT GRAIN DESIGN
THIOKOL CHEMICAL CORP ELKTON MD
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Approaches were evaluated for incorporating head- and aft-end effects on burning surfaces into a generalized computer program for determining the ballistics of internal burning grains. Specific attention is given to a computeroriented, vec orial appro ch for the calculation of burning surface areas, moments and products of inertia, cen er of mass, and total mass of a solid propellant rock t grain. This analysis method considers a large number of small elements of the grain which are bounded by normals to the inner web surface. Photostress evaluations of engine grain esign having star and cylindrical perforated configurations with similar web ratios are d cribed. The study includes analysis of grain structural behavior duri g temperature conditioning using strain readings for comparison. Evaluation of experimental photostress procedures and techniques using normal and oblique incidence readings were completed. Heat transfer studies were performed in an attempt to duplicate umerically, as well as by electrical analog, the actual thermal conditio ing his ory of an engine grain for which experimental thermal response data were obtained. Author
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