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Assessing the axial buckling load of a pressurized orthotropic cylindrical shell through vibration correlation technique

Franzoni, Felipe and Odermann, Falk and Wilckens, Dirk and Skukis, Eduards and Kalnins, Kaspars and Arbelo, Mariano and Degenhardt, Richard (2019) Assessing the axial buckling load of a pressurized orthotropic cylindrical shell through vibration correlation technique. Thin-Walled Structures, 137, pp. 353-366. Elsevier. DOI: 10.1016/j.tws.2019.01.009 ISSN 0263-8231

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Official URL: http://www.sciencedirect.com/science/article/pii/S0263823118307900

Abstract

Traditional buckling experiments of imperfection-sensitive structures like cylindrical shells can cause the permanent failure of the specimen. Nevertheless, an experimental campaign is crucial for validation of the design and numerical models. There is, therefore, interest in nondestructive methods to estimate the buckling load of such structures from the prebuckling stage. The vibration correlation technique allows determining the buckling load without reaching the instability point. Recently, a novel empirical vibration correlation technique based on the effects of initial imperfections on the first vibration mode demonstrated interesting results when applied to composite and metallic unstiffened cylindrical shells. In this context, this paper explores this novel approach for determining the axial buckling load of a metallic orthotropic skin-dominated cylindrical shell under internal pressure, which represents a simplified downscaled model of a launcher propellant tank. An experimental campaign consisting of buckling tests and noncontact vibration measurements for different axial load levels is conducted considering the specimen without and with three different internal pressure levels. The experimental results validate the above-mentioned vibration correlation technique for determining the axial buckling load of pressurized cylindrical shells. Moreover, finite element models are calibrated in order to evaluate the frequency variation within a broader and dense range of the axial loading leading to an assessment of the considered maximum load level and number of load steps as related to the deviation of the estimation. The results corroborate the applicability of the vibration correlation technique as a nondestructive experimental procedure to assess the axial buckling load of imperfection-sensitive orthotropic skin-dominated cylindrical shells under internal pressure.

Item URL in elib:https://elib.dlr.de/124707/
Document Type:Article
Title:Assessing the axial buckling load of a pressurized orthotropic cylindrical shell through vibration correlation technique
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Franzoni, FelipeFelipe.Franzoni (at) dlr.deUNSPECIFIED
Odermann, FalkFalk.Odermann (at) dlr.deUNSPECIFIED
Wilckens, DirkDirk.Wilckens (at) dlr.deUNSPECIFIED
Skukis, EduardsRTUUNSPECIFIED
Kalnins, KasparsRTUUNSPECIFIED
Arbelo, MarianoITAUNSPECIFIED
Degenhardt, RichardRichard.Degenhardt (at) dlr.deUNSPECIFIED
Date:April 2019
Journal or Publication Title:Thin-Walled Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:137
DOI :10.1016/j.tws.2019.01.009
Page Range:pp. 353-366
Publisher:Elsevier
ISSN:0263-8231
Status:Published
Keywords:Nondestructive experiments; vibration correlation technique; pressurized orthotropic cylindrical shells; buckling; imperfection-sensitive structures
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Franzoni, Felipe
Deposited On:14 Dec 2018 12:23
Last Modified:06 Sep 2019 15:20

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