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Constant single-buckle imperfection principle to determine a lower bound for the buckling load of unstiffened composite cylinders under axial compression

Wagner, Ronald and Hühne, Christian and Niemann, Steffen (2016) Constant single-buckle imperfection principle to determine a lower bound for the buckling load of unstiffened composite cylinders under axial compression. Composite Structures, 139, pp. 120-129. Elsevier. DOI: 10.1016/j.compstruct.2015.11.047 ISSN 0263-8223

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S0263822315010508

Abstract

Unstiffened cylindrical shells are very sensitive to geometric imperfections such as production-related deviations from the ideal geometry (conventional imperfections) as well as imperfect boundary conditions, material and wall thickness imperfections (non-conventional imperfections). The load carrying capability of unstiffened shells is reduced significantly by those imperfections. The NASA SP-8007 design guideline from 1968 is currently used for shell design. This guideline provides knock-down factors for the buckling loads and is based on experimental data of isotropic and orthotropic test specimen. Therefore the structural behavior of composite material is not considered adequately. Based on the single-perturbation load approach (SPLA), this paper introduces a new physical based approach, to determine a lower bound for the buckling load of unstiffened composite cylindrical shells with respect to conventional and non-conventional imperfections, the constant single-buckle imperfection (CSBI) principle. The CSBI principle is based on the theory of the metastability of the geometric imperfect cylindrical shell which is introduced within this paper. The results indicate that the CSBI principle has the potential to provide an improved shell design in order to reduce weight and cost of thin-walled shells.

Item URL in elib:https://elib.dlr.de/101421/
Document Type:Article
Title:Constant single-buckle imperfection principle to determine a lower bound for the buckling load of unstiffened composite cylinders under axial compression
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, Ronaldronald.wagner (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Niemann, Steffensteffen.niemann (at) dlr.deUNSPECIFIED
Date:1 April 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
Volume:139
DOI :10.1016/j.compstruct.2015.11.047
Page Range:pp. 120-129
Publisher:Elsevier
Series Name:Composite Structures
ISSN:0263-8223
Status:Published
Keywords:Buckling; Cylindrical composite shells; Single-perturbation load approach (SPLA); Geometric imperfections; Metastability of cylindrical shells
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 > Functional Lightweight Structures
Deposited By: Wagner, Ronald
Deposited On:30 Dec 2015 18:59
Last Modified:10 Jan 2019 15:46

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