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STIMULATING THE REALISTIC WORST CASE BUCKLING SCENARIO OF AXIALLY COMPRESSED UNSTIFFENED CYLINDRICAL COMPOSITE SHELLS

Wagner, Ronald and Hühne, Christian and Klaus, Rohwer and Wiedemann, Martin and Niemann, Steffen (2016) STIMULATING THE REALISTIC WORST CASE BUCKLING SCENARIO OF AXIALLY COMPRESSED UNSTIFFENED CYLINDRICAL COMPOSITE SHELLS. Composite Structures. Elsevier. DOI: http://dx.doi.org/10.1016/j.compstruct.2016.10.108, 2016. ISSN 0263-8223

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Abstract

The worst geometric imperfection is a mathematical concept which should deliver in theory a lower bound for the buckling load of unstiffened cylindrical shells. The corresponding knock-down factors could be used as base for improved shell design guidelines in order to reduce weight and cost of unstiffened shells. Commonly used worst geometric imperfections include eigenmode or axisymmetric imperfection pattern. However, experimental results show that the buckling is induced by an isolated single dimple which can be classified as a realistic worst geometric imperfection. It is hypothesized that the interaction between single dimple motion and the deformation behavior in the pre-buckling range of cylindrical shells significantly influences the buckling load. A numerical model is proposed in order to study the before mentioned thesis. The results show that the proposed numerical model induces a physical meaningful and realistic buckling response in a cylindrical shell. It can be validated that the interaction between single dimple motion and the deformation behavior of a cylinder in the pre-buckling range significantly influences the buckling load. Based on experimental data it can also be shown that the lower bound of the buckling load is accompanied by a characteristic post-buckling pattern shortly after collapse.

Item URL in elib:https://elib.dlr.de/106979/
Document Type:Article
Title:STIMULATING THE REALISTIC WORST CASE BUCKLING SCENARIO OF AXIALLY COMPRESSED UNSTIFFENED CYLINDRICAL COMPOSITE SHELLS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, RonaldRonald.Wagner (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Klaus, Rohwerklaus.rohwer (at) dlr.deUNSPECIFIED
Wiedemann, Martinmartin.wiedemann (at) dlr.deUNSPECIFIED
Niemann, Steffensteffen.niemann (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :http://dx.doi.org/10.1016/j.compstruct.2016.10.108, 2016.
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Buckling, cylindrical composite shells, worst imperfection, robust design
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Wagner, Ronald
Deposited On:21 Oct 2016 13:46
Last Modified:10 Jan 2019 15:47

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