Prefracture Behavior of Solid Propellants

摘要

A preliminary research in propellant prefracture behavior has been conducted. Both theoretical and experimental approaches have been carried out according to three phases of a program. Phase I was primarily concerned with the development of a mathematical model which would be applicable to a single prefracture configuration of solid propellant under stress. The occurrence of such a prefracture configuration in polymeric systems is usually termed a craze. Concurrently an experimental technique was to be developed for determining the displacement and stress fields in the vicinity of a craze. During this phase some specially prepared propellant polymers with and without ammonium perchlorate were tested. In Phase II extension to highly filled propellant polymer samples was to be added to the investigations. Phase III was to extend the studies to massive crazing and craze-crack transition and fracture propagation. This report covers the attempts made and work done in Phase I. Since the nature of this research is basic and complex, the efforts and developments are reported under separate headings as reflected in Section 2.