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The Effects of Geometric and Loading Imperfections on the Response and Lower-Bound Buckling Load of a Compression-Loaded Cylindrical ShellResults from a numerical study of the buckling response of a thin-walled compressionloaded isotropic circular cylindrical shell with initial geometric and loading imperfections are used to determine a lower bound buckling load estimate suitable for preliminary design. The lower bound prediction techniques presented herein include an imperfection caused by a lateral perturbation load, an imperfection in the shape of a single stress-free dimple (similar to the lateral pertubation imperfection), and a distributed load imperfection that induces a nonuniform load in the shell. The ABAQUS finite element code is used for the analyses. Responses of the cylinders for selected imperfection amplitudes and imperfection types are considered, and the effect of each imperfection is compared to the response of a geometrically perfect cylinder. The results indicate that compression-loaded shells subjected to a lateral perturbation load or a single dimple imperfection, and a nonuniform load imperfection, exhibit similar buckling behavior and lower bound trends and the predicted lower bounds are much less conservative than the corresponding design recommendation NASA SP-8007 for the design of buckling-critical shells. In addition, the lateral perturbation technique and the distributed load imperfection produce response characteristics that are physically meaningful and can be validated via laboratory testing.
Document ID
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Kriegesmann, Benedikt
(Leibniz Universitaet Hannover, Germany)
Hilburger, Mark W.
(NASA Langley Research Center Hampton, VA, United States)
Rolfes, Raimund
(Leibniz Universitaet Hannover, Germany)
Date Acquired
August 25, 2013
Publication Date
April 23, 2012
Subject Category
Structural Mechanics
Report/Patent Number
AIAA Paper 2012-1864
Meeting Information
Meeting: 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Location: Honolulu, HI
Country: United States
Start Date: April 23, 2012
End Date: April 26, 2012
Sponsors: American Society of Mechanical Engineers, American Society of Civil Engineers, American Society for Composites, American Inst. of Aeronautics and Astronautics, American Helicopter Society, Inc.
Distribution Limits
Public Use Permitted.
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