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A quantitative assessment of random field models in finite element buckling analyses of composite cylinders

Oberguggenberger, M. and De Groof, L. and Haller, H. and Degenhardt, Richard and Kling, Alexander (2012) A quantitative assessment of random field models in finite element buckling analyses of composite cylinders. DGLR Congress, 10.-14.Sept. 2012, Berlin, Germany.

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Abstract

Large scatter characterizes the collapse load of thin-walled structures due to their imperfection sensitivity. Random fields can be used to include imperfections in a finite element model. Principal component analysis and analytical covariance functions are matched to available correlation information of geometrical imperfection measurements. The random fields are realized by Karhunen-Loève expansion combined with Monte Carlo methods. The results of the different covariance models are compared with the deterministic collapse loads of the measured imperfections in the FE-model. This approach isolates the effect of the different covariance models from other inaccuracies such as boundary conditions, loading imperfections, etc. The results show that random fields models can improve predictions and the understanding of the structural behavior of thin-walled structures, especially by using data based PCA. Caution is recommended with regard to analytical covariance functions since they may fail to capture the complete behavior of the structure.

Item URL in elib:https://elib.dlr.de/83837/
Document Type:Conference or Workshop Item (Speech)
Title:A quantitative assessment of random field models in finite element buckling analyses of composite cylinders
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Oberguggenberger, M.Universität InnsbruckUNSPECIFIED
De Groof, L.INTALES GmbHUNSPECIFIED
Haller, H.Universität InnsbruckUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Kling, AlexanderUNSPECIFIEDUNSPECIFIED
Date:2012
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Random fields, Monte Carlo simulation, buckling analysis, composite shells
Event Title:DGLR Congress
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:10.-14.Sept. 2012
Organizer:DGLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:10 Dec 2013 19:01
Last Modified:31 Jul 2019 19:41

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