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Investigation on the Geometric Imperfections driven Local Buckling Onset in Composite Conical Shells

Di Pasqua, Maria Francesca and Khakimova, Regina and Castro, Saullo and Arbelo, Mariano and Riccio, Aniello and Raimondo, Antonio and Degenhardt, Richard (2016) Investigation on the Geometric Imperfections driven Local Buckling Onset in Composite Conical Shells. Applied Composite Materials, 23, pp. 879-897. Springer. ISSN 0929-189X

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Official URL: https://link.springer.com/article/10.1007/s10443-016-9490-7

Abstract

Buckling is a critical failure phenomenon for structures, and represents a threat for thin shells subjected to compressive forces. The global buckling load, for a conical structure, depends on the geometry and material properties of the shell, on the stacking sequence, on the type of applied load and on the initial geometric imperfections. Geometric imperfections, occurring inevitably during manufacturing and assembly of thin-walled composite structures, produce a reduction in the carrying load capability with respect to the design value. This is the reason why investigating these defects is of major concern in order to avoid over-conservative design structures. In this paper, the buckling behavior a conical structure with 45° semi-vertical angle is numerically investigated. The initial imperfections are taken into account by using different strategies. At first, the Single Perturbation Load Approach (SPLA), which accounts for defects in the form of a lateral load, normal to the surface, has been adopted. Then, the actual measured defects have been applied to the structure by using the Real Measured Mid-Surface Imperfections (MSI) approach. Investigations on cylindrical shells using the first strategy have already shown the occurrence of a particular phenomenon called “local snap-through”, which represents a preliminary loss of stiffness. In order to better understand this phenomenon for conical shells, both the aforementioned techniques have been used to provide an exhaustive overview of the imperfections sensitiveness in conical composite shells. This study is related to part of the work performed in the frame of the European Union (EU) project DESICOS.

Item URL in elib:https://elib.dlr.de/114122/
Document Type:Article
Title:Investigation on the Geometric Imperfections driven Local Buckling Onset in Composite Conical Shells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Di Pasqua, Maria FrancescaPFHUNSPECIFIED
Khakimova, ReginadlrUNSPECIFIED
Castro, Saullopfh göttingenUNSPECIFIED
Arbelo, Marianopfh göttingenUNSPECIFIED
Riccio, AnielloUNSPECIFIEDUNSPECIFIED
Raimondo, AntonioUNSPECIFIEDUNSPECIFIED
Degenhardt, RicharddlrUNSPECIFIED
Date:20 April 2016
Journal or Publication Title:Applied Composite Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:23
Page Range:pp. 879-897
Publisher:Springer
ISSN:0929-189X
Status:Published
Keywords:Global buckling Local snap-through Conical shells Composite
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:18 Sep 2017 09:36
Last Modified:10 Jan 2019 15:46

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