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Towards robust knockdown factors for the design of conical shells under axial compression

Wagner, Ronald and Hühne, Christian and Khakimova, Regina (2018) Towards robust knockdown factors for the design of conical shells under axial compression. International Journal of Mechanical Sciences, 146, pp. 60-80. doi: 10.1016/j.ijmecsci.2018.07.016. ISSN 0020-7403.

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Thin-walled conical shells are used as adapters between cylindrical shells of different diameters in launch-vehicle systems. Conical shells carry heavy payloads and are consequently subjected to axial compression. The buckling load of these shells is very sensitive to imperfections (geometry, loading conditions) which results in a critical disagreement between theoretical and experimental results for axially loaded conical shells. The design of these stability critical shells is based on classical buckling loads obtained by a linear analysis which are corrected by a single knockdown factor (0.33 - NASA SP-8019) for all cone geometries. This practice is well established among designers and hasn't changed for the past 50 years because the buckling behavior is till today not very well understood. Within this paper an analytical and numerical lower-bound procedure for conical shells under axial compression is proposed. Data of previous experimental testing campaigns are used to validate the new design criteria for different conical shell geometry configurations. The whole design concept is demonstrated by means of the Interstage 1/2 of the Vega launcher and it is concluded that a revision of the current design recommendation for conical shell structures may results in a significant weight reduction potential.

Item URL in elib:https://elib.dlr.de/125095/
Document Type:Article
Title:Towards robust knockdown factors for the design of conical shells under axial compression
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wagner, Ronaldronald.wagner (at) dlr.deUNSPECIFIED
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:October 2018
Journal or Publication Title:International Journal of Mechanical Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijmecsci.2018.07.016
Page Range:pp. 60-80
Keywords:Buckling; Robust design; Knockdown factor; Imperfection; Truncated cone; Threshold knockdown factor; Vega launcher
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Niemann, Herr Steffen
Deposited On:14 Dec 2018 11:56
Last Modified:14 Dec 2018 11:56

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