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Robust knockdown factors for the design of axially loaded cylindrical and conical composite shells – Development and Validation

Wagner, Ronald and Hühne, Christian and Niemann, Steffen (2017) Robust knockdown factors for the design of axially loaded cylindrical and conical composite shells – Development and Validation. Composite Structures (173), pp. 281-303. Elsevier. DOI: https://doi.org/10.1016/j.compstruct.2017.02.031 ISSN 0263-8223

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S0263822316324278

Abstract

The stability failure of the axially loaded cylindrical shell is considered as the last unresolved classical stability problem, although it has been investigated for over 100 years. Therefore designers rely on the application of empirical knockdown factors from the 1960s like the NASA SP-8007 for cylindrical shells and the NASA SP-8019 for truncated conical shells which are very conservative for modern shell structures. Perturbation approaches for the design of axially loaded cylindrical and conical shells are presented in this paper. These approaches deliver knockdown factors for a physical based estimation of the lower-bound buckling load and are suitable for research and industrial applications as they are independent from imperfection measurements and easy to implement. The corresponding numerical models are validated by means of high-fidelity buckling experiments and it shows that experimental buckling loads can be calculated very precisely in contrast to the previous methodology. Additionally, new robust knockdown factors are proposed for preliminary shell design which are based on curve fitting of numerical knockdown factors of the perturbation approaches. Thus, it is possible to utilize the load bearing capability of launch-vehicle primary structures up to 40% more effectively, resulting in considerable weight saving potentials for composite shell structures.

Item URL in elib:https://elib.dlr.de/112424/
Document Type:Article
Title:Robust knockdown factors for the design of axially loaded cylindrical and conical composite shells – Development and Validation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, RonaldRonald.Wagner (at) dlr.deUNSPECIFIED
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Niemann, Steffensteffen.niemann (at) dlr.deUNSPECIFIED
Date:August 2017
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 :https://doi.org/10.1016/j.compstruct.2017.02.031
Page Range:pp. 281-303
Editors:
EditorsEmail
Ferreira, A.J.M.UNSPECIFIED
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Buckling; Composite shells; Robust design; Knockdown factor; High-fidelity design; Imperfection; Single perturbation load approach; Cylinder; Truncated cone
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:29 Jun 2017 13:28
Last Modified:10 Jan 2019 15:47

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