FUNDAMENTAL STUDIES RELATING TO SYSTEMS ANALYSIS OF SOLID PROPELLANTS
CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS
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A description is presented of the type of structural complications introduced by a viscoelastic material to provide background information for evaluating the structural integrity of a solid propellant rocket grain. From the engineering standpoint the problem areas were separated into 3 categories 1 characterization of material properties 2 analysis procedures and 3 failure criteria. The assumptions under which the analysis was made are that 1 the viscoelastic medium is isotropic, homogeneous, and continuous 2 deformations are sufficiently small to be considered infinitesimal 3 inertia forces, due to straining, are neglected and 4 idealized geometries are considered for which analytical solutions may be obtained. Discussions on material characterization include the operational concept for stress-strain relations, linear viscoelastic and model representation, spectral distribution functions, temperature-time shift phenomena, and mechanical property determination.
- Solid Rocket Propellants