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Experimental and numerical study on the influence of imperfections on the buckling load of unstiffened CFRP shells

Schillo, Conny and Röstermundt, Dirk and Krause, Dieter (2015) Experimental and numerical study on the influence of imperfections on the buckling load of unstiffened CFRP shells. Composite Structures, 2015 (131), pp. 128-138. Elsevier. ISSN 0263-8223

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Official URL: http://www.sciencedirect.com/science/article/pii/S026382231500327X


Due to a lack of statistical data, unstiffened cylindrical lightweight structures are designed following a knockdown factor (KDF) approach described in the NASA SP-8007 (Weingarten and Seide, 1965). This approach aims at a lower-bound, conservative design. The basis for the proposed KDFs are a number of tests with different, partially unknown boundary conditions and imperfection patterns for metallic cylinders that do not resemble the imperfection patterns achieved by state-of-the-art manufacturing methods for cylinders made of carbon fibre reinforced plastics (CFRP). Within this work, two CFRP tubes are manufactured using the filament winding method and are cut into a total of 12 cylinders from which optical measurements are taken to analyse characteristics of the corresponding imperfection patterns. 11 cylinders are tested in axial compression until buckling occurs and tests are accompanied by high speed displacement measurements, thermography and measurements of occurring load imperfections. Four different FE-models, which differ in the parameters considered, are set up for prediction of the buckling load of each cylinder. Model response showed the highest sensitivity to load imperfections. Negligence of this parameter lead to a 15% increase of the corresponding model bias while geometric imperfections made up for only 3%.

Item URL in elib:https://elib.dlr.de/99329/
Document Type:Article
Title:Experimental and numerical study on the influence of imperfections on the buckling load of unstiffened CFRP shells
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Röstermundt, DirkDirk.Roestermundt (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 128-138
Series Name:Composite Structures
Keywords:Buckling; Composite shells; Imperfections; Model uncertainty
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Composite Technology
Deposited By: Wolff, Sibylle
Deposited On:11 Jan 2016 09:18
Last Modified:10 May 2016 23:34

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