The simplest spherical steel blast containment chamber comprises a spherical shell with a single access port large enough to provide the access required by the application to the interior of the chamber. For small chambers, the access port may approach the radius of the chamber. Such a relatively large port requires a heavy reinforcing ring structure to avoid stress concentrations around the port. The eccentricity caused by the port reinforcement leads to undesirably large localized bending mode stresses following a blast containment event. These stresses can exceed the first-cycle fundamental response to the blast load by a factor greater than two. This paper describes the development of a finite element program to analyze the occurrence of these complex oscillations. This quick-running program provides a means to evaluate design modifications to control unwanted oscillations. This approach leads to the development of safe cost-effective blast containment chamber designs.

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