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On the imperfection sensitivity and design of tori-spherical shells under external pressure

Wagner, H.N.R. and Pototzky, Alexander and Hühne, Christian (2021) On the imperfection sensitivity and design of tori-spherical shells under external pressure. International Journal of Pressure Vessels and Piping, p. 104321. Elsevier. doi: 10.1016/j.ijpvp.2021.104321. ISSN 0308-0161.

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Tori-spherical shells are often used as enclosures of pressure vessels in ocean and civil engineering. When subjected to external pressure, these thin-walled shells are prone to buckling. The corresponding critical buckling pressure heavily depends on deviations from the ideal shell shape, but also the yield strength as well as the knuckle radius. This article summarizes and analyzes all known experimental results for tori-spherical shells under external pressure. A detailed numerical elastic-plastic buckling analysis of a tori-spherical bulkhead is presented including details regarding non-linear material model, finite-element modeling and solver settings. In addition, a wide variety of empirical design and numerical geometric imperfection approaches for tori-spheres are presented, applied and validated. Among the geometric imperfection approaches are realistic measured geometric imperfections, dimple imperfections, flat patch imperfections and reduced stiffness methods. Large scale parametric imperfection amplitude analyzes are performed in order to determine which imperfection concept delivers in general the best fit to experimental results. New design factors for different tori-spherical shell geometry configurations are consequently developed and validated with experimental results. The new design factors lead to significantly improved critical load estimations in comparison to lower-bounds obtained empirically.

Item URL in elib:https://elib.dlr.de/140948/
Document Type:Article
Title:On the imperfection sensitivity and design of tori-spherical shells under external pressure
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wagner, H.N.R.ro.wagner (at) tu-braunschweig.dehttps://orcid.org/0000-0003-2749-1455
Pototzky, AlexanderAlexander.Pototzky (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:January 2021
Journal or Publication Title:International Journal of Pressure Vessels and Piping
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijpvp.2021.104321
Page Range:p. 104321
Keywords:Buckling; Robust design; Knockdown factor; Imperfection sensitivity; Tori-spherical shell
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Leitprojekt - Forschungsverbund Oberstufe (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Hühne, Prof. Dr. Christian
Deposited On:02 Mar 2021 06:57
Last Modified:02 Mar 2021 06:57

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