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Buckling of axially compressed CFRP truncated cones: experimental and numerical investigation

Khakimova, Regina and Wilckens, Dirk and Reichardt, Jasper and Zimmermann, Rolf and Degenhardt, Richard (2016) Buckling of axially compressed CFRP truncated cones: experimental and numerical investigation. Composite Structures, 146, pp. 232-247. Elsevier. ISSN 0263-8223

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Abstract

Thin-walled conical structures are widely used in aerospace, offshore, civil and other engineering fields. Parts of space launcher transport systems are one example for the application of conical shells. Buckling of such thin-walled imperfection sensitive structures is a very important phenomenon to be considered during their design phase. Nowadays, the analysts still use empirically based lower-bound methods such as the NASA SP-8007 for cylinders and SP-8019 for cones to calculate the required knock-down factors (KDFs), which 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. The study deals with the buckling experiments on axially compressed, unstiffened carbon fiber– reinforced polymer (CFRP) truncated cones performed by DLR for validation of high-fidelity numerical models. Three geometrically identical cones with different layup were designed, manufactured and tested. Before testing, the thickness of the cones 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 were taken. Modeling of shape mid-surface, thickness and ply piece imperfections are included into the Finite Element Analysis (FEA) of the test structures, and the experimental results are compared with the FEA results.

Item URL in elib:https://elib.dlr.de/114121/
Document Type:Article
Title:Buckling of axially compressed CFRP truncated cones: experimental and numerical investigation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Khakimova, ReginadlrUNSPECIFIED
Wilckens, DirkDLRUNSPECIFIED
Reichardt, JasperPFHUNSPECIFIED
Zimmermann, RolfDLRUNSPECIFIED
Degenhardt, RicharddlrUNSPECIFIED
Date:22 February 2016
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:146
Page Range:pp. 232-247
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Buckling Tests Thin-walled structure CFRP truncated conical shell Imperfections FEA
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 09:11
Last Modified:25 Sep 2017 09:11

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