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

De Groof, V. and Haller, H. and Degenhard, Richard and Kling, Alexander (2012) Quantitative assessment of random field models in finite element buckling analyses of composite cylinders. ECCOMAS, 10.-14.Sept. 2012, Vienna, Austria.

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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, which can highly increase the credibility of the finite element (FE) model. Principal component analysis (PCA) and analytical covariance functions are matched to available correlation information of geometrical imperfection measurements. The random fields are realized by Karhunen-Lo`eve 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 can be used to improve predictions and the understanding of the structural behavior of thin-walled structures, especially when these predictions are based on imperfection data, using PCA. Caution is recommended when using analytical covariance functions since they may fail to capture the complete behavior of the structure.

Item URL in elib:https://elib.dlr.de/83836/
Document Type:Conference or Workshop Item (Speech)
Title:Quantitative assessment of random field models in finite element buckling analyses of composite cylinders
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
De Groof, V.Universit¨at InnsbruckUNSPECIFIED
Haller, H.INTALES GmbHUNSPECIFIED
Degenhard, 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:ECCOMAS
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:10.-14.Sept. 2012
Organizer:ECCOMAS
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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