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Buckling of axially compressed CFRP cylinders with and without additional lateral load: experimental and numerical investigation

Khakimova, Regina and Castro, Saullo and Wilckens, Dirk and Rohwer, Klaus and Degenhardt, Richard (2017) Buckling of axially compressed CFRP cylinders with and without additional lateral load: experimental and numerical investigation. Thin-Walled Structures, 119, pp. 178-189. Elsevier. ISSN 0263-8231

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Abstract

Thin-walled structures are widely used in aerospace, offshore, civil, marine and other engineering industries. Buckling of such thin-walled imperfection sensitive structures is a very important phenomenon to be considered during their design phase. Existing design guidelines, being the most known the NASA SP-8007 for cylinders dated from the late 1960's are currently used in the aerospace industry and employ conservative lower-bound knock-down factors. These empirically based lower-bound methods do not include important mechanical properties of laminated composite materials, such as the stacking sequence. New design approaches that allow taking full advantage of composite materials are therefore required. This study deals with buckling experiments of axially compressed, unstiffened carbon fiber–reinforced polymer (CFRP) cylinders with and without an additional lateral load. Two geometrically identical cylinders with the same layup were designed, manufactured and tested. Before testing, the thickness of the cylinders was measured with ultrasonic inspection and the geometry was measured utilizing a 3D scanning system based on photogrammetry. During testing, a digital image correlation system was employed to monitor deformations, strain gage readings and load-shortening data was taken. Modelling of shape mid-surface and thickness imperfections as well as fiber volume fraction correction are included into the Finite Element Analysis (FEA) of the test structures, and the experimental results are compared against FEA results.

Item URL in elib:https://elib.dlr.de/114123/
Document Type:Article
Title:Buckling of axially compressed CFRP cylinders with and without additional lateral load: experimental and numerical investigation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Khakimova, ReginadlrUNSPECIFIED
Castro, Saullopfh göttingenUNSPECIFIED
Wilckens, DirkUNSPECIFIEDUNSPECIFIED
Rohwer, KlausKlaus.Rohwer (at) dlr.deUNSPECIFIED
Degenhardt, RicharddlrUNSPECIFIED
Date:2017
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:119
Page Range:pp. 178-189
Publisher:Elsevier
Series Name:elsevier
ISSN:0263-8231
Status:Published
Keywords:Buckling tests Thin-walled structure Cylindrical shell Imperfections FEA Lateral load
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 > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:25 Sep 2017 09:12
Last Modified:06 Sep 2019 15:20

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