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Comparison of Methods to Predict Lower Bound Buckling Loads of Cylinders Under Axial CompressionResults from a numerical study of the buckling response of two different orthogrid stiffened circular cylindrical shells with initial imperfections and subjected to axial compression are used to compare three different lower bound buckling load prediction techniques. These lower bound prediction techniques assume different imperfection types and include an imperfection based on a mode shape from an eigenvalue analysis, an imperfection caused by a lateral perturbation load, and an imperfection in the shape of a single stress-free dimple. The STAGS finite element code is used for the analyses. Responses of the cylinders for ranges of imperfection amplitudes are considered, and the effect of each imperfection is compared to the response of a geometrically perfect cylinder. Similar behavior was observed for shells that include a lateral perturbation load and a single dimple imperfection, and the results indicate that the predicted lower bounds are much less conservative than the corresponding results for the cylinders with the mode shape imperfection considered herein. In addition, the lateral perturbation technique and the single dimple imperfection produce response characteristics that are physically meaningful and can be validated via testing.
Document ID
20100016261
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Haynie, Waddy T.
(NASA Langley Research Center Hampton, VA, United States)
Hilburger, Mark W.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2010
Subject Category
Structural Mechanics
Report/Patent Number
AIAA Paper -2010-2532
LF99-9209
Meeting Information
Meeting: 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Location: Orlando, FL
Country: United States
Start Date: April 12, 2010
End Date: April 15, 2010
Sponsors: American Society of Mechanical Engineers, American Society of Civil Engineers, American Helicopter Society, Inc., American Inst. of Aeronautics and Astronautics, American Society for Composites
Funding Number(s)
WBS: WBS 869021.04.07.01.13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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