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Numerical characterization of imperfection sensitive composite structures

Arbelo, Mariano and Degenhardt, Richard and Castro, Saullo and Zimmermann, Rolf (2014) Numerical characterization of imperfection sensitive composite structures. Composite Structures, 108, pp. 295-303. Elsevier. DOI: 10.1016/j.compstruct.2013.09.041 ISSN 0263-8223

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Official URL: http://http://www.sciencedirect.com/science/article/pii/S0263822313004881

Abstract

Currently, imperfection sensitive shell structures prone to buckling are designed according to the NASA SP-8007 guideline, from 1968, using its conservative lower bound curve. In this guideline the structural behavior of composite materials is not appropriately considered, since the imperfection sensitivity and the buckling load of shells made of such materials depend on the lay-up design. In this context a numerical investigation about the different methodologies to characterize the behavior of imperfection sensitive composite structures subjected to compressive loads up to buckling is presented in this paper. A comparative study is addressed between a new methodology, called “Single Perturbation Load Approach”, adopted by the European project DESICOS, and some classical approaches such as non-linear analyses considering geometric and thickness imperfection obtained from real measurements. An extension of the Single Perturbation Load Approach called “Multiple Perturbation Load Approach” is also introduced in this paper to investigate if one perturbation load is enough to create the worst geometrical imperfection case. The aim of this work is to validate these numerical methodologies with experimental results and point out their limitation, advantage and disadvantage, to calculate less conservative knock-down factors than the obtained with the NASA SP-8007 guideline for unstiffened composite cylinders.

Item URL in elib:https://elib.dlr.de/90105/
Document Type:Article
Title:Numerical characterization of imperfection sensitive composite structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arbelo, MarianoPFH GöttingenUNSPECIFIED
Degenhardt, RichardDLRUNSPECIFIED
Castro, SaulloPFH GöttingenUNSPECIFIED
Zimmermann, RolfDLRUNSPECIFIED
Date:February 2014
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:108
DOI :10.1016/j.compstruct.2013.09.041
Page Range:pp. 295-303
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Shell buckling; Knock-down factor; Thin-walled structures; Composite materials; Finite element model
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 - HL-Primärstrukturen für Orbitale Systeme
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:11 Aug 2014 08:19
Last Modified:10 Jan 2019 15:46

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