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On the development of shell buckling knockdown factors for imperfection sensitive conical shells under pure bending

Wagner, Ronald and Hühne, Christian and Khakimova, Regina (2019) On the development of shell buckling knockdown factors for imperfection sensitive conical shells under pure bending. Thin-Walled Structures, 145. Elsevier. DOI: 10.1016/j.tws.2019.106373 ISBN ISSN 0263-8231 ISSN 0263-8231

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Official URL: https://www.sciencedirect.com/science/article/pii/S026382311930583X?via%3Dihub#!

Abstract

Thin-walled conical shells are used as adapters between cylindrical shells of different diameters in launch-vehicle systems or as tailbooms in helicopters. A major loading scenario for conical shells is pure bending. The buckling moment of these shells is very sensitive to imperfections (geometry, loading conditions) which results in a critical disagreement between theoretical and experimental results for conical shells under pure bending. 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 (0.41 - 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 a reduced stiffness analysis for conical shells under pure bending is performed. Data of previous experimental testing campaigns are used to validate the new design criteria for different conical shell geometry configurations. The results show that the application of the new design recommendation for conical shell structures results in increased knockdown factors for the buckling moment which in turn may lead to a significant weight reduction potential. All ABAQUS-Python scripts and the results generated for this article are deposited in the Elsevier repository.

Item URL in elib:https://elib.dlr.de/129525/
Document Type:Article
Title:On the development of shell buckling knockdown factors for imperfection sensitive conical shells under pure bending
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wagner, Ronaldro.wagner (at) tu-braunschweig.dehttps://orcid.org/0000-0003-2749-1455
Hühne, Christianchristian.huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Khakimova, ReginaUNSPECIFIEDUNSPECIFIED
Date:2019
Journal or Publication Title:Thin-Walled Structures
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:145
DOI :10.1016/j.tws.2019.106373
Publisher:Elsevier
ISSN:0263-8231
ISBN:ISSN 0263-8231
Status:Published
Keywords:Shell buckling Robust design Knockdown factor Imperfection Truncated cone Reduced stiffness analysis
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 - Leitprojekt - Forschungsverbund Oberstufe, L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Kafka, Elena
Deposited On:14 Oct 2019 04:38
Last Modified:19 Feb 2020 10:25

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