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STAGS finite element model of an axially compressed cylindrical thin shell with a crack

This and the next two slides show the model and nonlinear static and dynamic predictions from the STAGS computer program.

From:
James H. Starnes, Jr. and Cheryl A. Rose (NASA Langley Research Center, Hampton, Virginia, USA), “Buckling and stable tearing responses of unstiffened aluminum shells with long cracks”, AIAA-98-1991, 39th AIAA Structures, Structural Dynamics and Materials Conference, 1998

ABSTRACT: The results of an analytical and experimental study of the nonlinear response of thin, unstiffened, aluminum cylindrical shells with a long longitudinal crack are presented. The shells are analyzed with a nonlinear shell analysis code that accurately accounts for global and local structural response phenomena. Results are presented for internal pressure and for axial compression loads. The effect of initial crack length on the initiation of stable tearing and unstable crack growth in typical shells subjected to internal pressure loads is predicted using geometrically nonlinear elastic-plastic finite element analyses. The results of these analyses and of the experiments indicate that the pressure required to initiate stable tearing and unstable tearing in a shell subjected to internal pressure loads decreases as the crack length increases. The effects of crack length on the prebuckling, buckling and postbuckling responses of typical shells subjected to axial compression are also described. For this loading condition, the crack length is held constant. The results of the analyses illustrate the influence of crack length on shell buckling instabilities. The experimental and analytical results correlate well.

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