Buckling Load Prediction in Ortho-Grid Plates for Aerospace Structures

Iso-grid structures provide high strength with reduced weights, which is an essential requirement for aerospace applications. Buckling of Ortho-grid structure is a phenomenon with complex interaction between skin, stiffeners and sub-stiffeners. Introduction of sub-stiffeners increases the load beari...

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Bibliographic Details
Published in:Journal of failure analysis and prevention 2018-06, Vol.18 (3), p.647-658
Main Authors: Sabir, Rizwan, Khan, Abid Ali, Hasham, Hassan Junaid, Khan, Irfan Ali
Format: Article
Language:English
Subjects:
Aerospace industry
Bearing capacity
Buckling
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Corrosion and Coatings
Finite element method
Grid stiffened structures
Load bearing elements
Materials Science
Matlab
Plates (structural members)
Quality Control
Reliability
Safety and Risk
Solid Mechanics
Stiffeners
Technical Article > -Peer-Reviewed
Tribology
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Summary:Iso-grid structures provide high strength with reduced weights, which is an essential requirement for aerospace applications. Buckling of Ortho-grid structure is a phenomenon with complex interaction between skin, stiffeners and sub-stiffeners. Introduction of sub-stiffeners increases the load bearing capacity of the structures many folds as compared to the classical Iso-grid or Ortho-grid structure. In this work, a customized MATLAB ® code is developed for computational analysis based on finite element (FE) analysis. In case of FE analysis, the degenerated shell element is used. In the first phase of the MATLAB ® code development, an elasto-plastic analysis of a clamped quadratic-shell is performed and the results are verified with the published literature. In the next phase, the buckling analysis of thin-plate is performed and the results are again verified with the literature. After verification of developed code, FE analysis of the Ortho-grid-stiffened plates is successfully validated. The results attained from developed code are compared with analysis performed on ANSYS ® software along with the published work. The results revalidate the fact that stiffeners increase buckling load by over fifty times, which stands the main motive for their use in aerospace industry.
ISSN:1547-7029
1728-5674
1864-1245
DOI:10.1007/s11668-018-0453-1