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Investigations on imperfection sensitivity and deduction of improved knock-down factors for unstiffened CFRP cylindrical shells

Degenhardt, Richard and Kling, Alexander and Bethge, Arne and Orf, Jana and Kärger, Luise and Zimmermann, Rolf and Rohwer, Klaus and Calvi, Adriano (2010) Investigations on imperfection sensitivity and deduction of improved knock-down factors for unstiffened CFRP cylindrical shells. Composite Structures, 92 (8), pp. 1939-1946. Elsevier Ltd.. DOI: 101016/j.compstruct.2009.12.014. ISSN 0263-8223.

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Abstract

In the field of aerospace engineering but also in the fields of civil and mechanical engineering the industry demands for significantly reduced costs for development and operating. Reduction of structural weight at safe design is one avenue to achieve this objective. In many cases it results in thin-walled structures, which are prone to buckling if subjected to compression or shear. The presented paper is based on a recent European Space Agency (ESA) study, conducted at DLR Braunschweig, on Probabilistic Aspects of Buckling Knock-Down Factors and contributes to this goal by striving for an improved buckling knock-down factor (the ratio of buckling loads of imperfect and perfect structures) for unstiffened CFRP cylindrical shells. Buckling tests and buckling simulations were performed to investigate the imperfection sensitivity and to validate the applied simulation methodologies. Test results as well as deterministic and probabilistic buckling simulation results are presented and compared. Finally, improved knock-down factors are deduced and discussed.

Document Type:Article
Title:Investigations on imperfection sensitivity and deduction of improved knock-down factors for unstiffened CFRP cylindrical shells
Authors:
AuthorsInstitution or Email of Authors
Degenhardt, RichardUNSPECIFIED
Kling, AlexanderUNSPECIFIED
Bethge, ArneUNSPECIFIED
Orf, JanaUNSPECIFIED
Kärger, LuiseUNSPECIFIED
Zimmermann, RolfUNSPECIFIED
Rohwer, KlausUNSPECIFIED
Calvi, AdrianoESA/ESTEC, Structures Section TEC-MCS, Noordwijk, Netherlands
Date:July 2010
Journal or Publication Title:Composite Structures
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:92
DOI:101016/j.compstruct.2009.12.014
Page Range:pp. 1939-1946
Editors:
EditorsEmail
Ferreira , A.J.M.UNSPECIFIED
Publisher:Elsevier Ltd.
ISSN:0263-8223
Status:Published
Keywords:Cylinder; Knock-down factor; Buckling; Composites; CFRP; Imperfections
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Doris Ries
Deposited On:22 Jun 2010 10:00
Last Modified:07 Feb 2013 21:05

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