Abstract
A method is presented for evaluating two-dimensional crack behavior in rocket motor geometries for pressure loadings in which the pressure is applied directly to the crack surfaces. The experimental requirements associated with pressurizing the crack necessitated the application of pressure over the two-dimensional plane surface of the specimen. Analytical solutions are developed which include the side pressure and relate the stress intensity factors to the classical unpressurized situation. Stress intensity factors for the complex cracked rocket motor geometries were evaluated using finite element computer techniques based on strain energy methods. Comparison between analytical predictions using elastic fracture mechanics and experimental observations of a brittle epoxy was quite good for the three different geometries tested. The work has application in fracture analysis of solid propellant rocket grains and in pressure vessels containing partial-thickness cracks which emanate from the inside.
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