A 3-D finite-element model was used to simulate the severe and localized thermal/pressure transients and the resulting stresses experienced by a rifled ceramic-barrel with a steel outer-liner; the focus of the simulations was on the influence of non-traditional rifling geometries on the thermoelastic- and pressure-stresses generated during a single firing event. In order to minimize computational requirements, a twisted segment of the barrel length based on rotational symmetry was used. Using this simplification, the model utilized uniform heating and pressure across the ID surface via a time-dependent convective coefficient and pressure generated by the propellant gasses. Results indicated that the unique rifling geometries had only a limited influence on the maximum circumferential (hoop) stresses and temperatures when compared with more traditional rifling configurations because of the compressive thermal stresses developed at the heated (and rifled) surface.
Finite-Element Simulations and Probabilistic Fracture Assessments of the Response of Alternate Rifling Geometries
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Segall, AE, & Carter, R. "Finite-Element Simulations and Probabilistic Fracture Assessments of the Response of Alternate Rifling Geometries." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. San Antonio, Texas, USA. July 22–26, 2007. pp. 519-528. ASME. https://doi.org/10.1115/PVP2007-26081
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