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Comparison of new Design Guidelines for Composite Cylindrical Shells prone to Buckling

Arbelo, Mariano and Zimmermann, R. and Castro, Saullo and Degenhardt, Richard (2013) Comparison of new Design Guidelines for Composite Cylindrical Shells prone to Buckling. ICCST-9 Conference, 24.-26.April 2013, Sorrento, Italy.

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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. Due to the fact that this approach is outdated for preliminary design purposes, several authors are investigating less conservative methodologies. Some authors propose a new lower-bound curve approach based only on statistical analysis of experimental test on composite cylinders. The problem with this approach is that the range of applicability is limited to the database extension. Finite element models are also used by many researchers to characterize the behavior of cylindrical shell considering different types of material and geometrical imperfections. A representative finite element model allows studying a widespread area of possibilities from the design point of view. 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 new deterministic methodologies, such as the “Single Perturbation Load Approach” proposed by the European project DESICOS and new statistical approaches based on experimental test on composite cylinders. The aim of this work is to define the range of applicability of these methodologies for unstiffened composite cylinders, advantage and disadvantage to use as a design tool, to provide means to calculate less conservative knock-down factors than the obtained with the NASA SP-8007 guideline.

Item URL in elib:https://elib.dlr.de/83851/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of new Design Guidelines for Composite Cylindrical Shells prone to Buckling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arbelo, MarianoPFH GöttingenUNSPECIFIED
Zimmermann, R.UNSPECIFIEDUNSPECIFIED
Castro, SaulloPFH GöttingenUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Shell buckling, knock-down factor, composite materials, finite element models
Event Title:ICCST-9 Conference
Event Location:Sorrento, Italy
Event Type:international Conference
Event Dates:24.-26.April 2013
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:11 Nov 2013 16:39
Last Modified:31 Jul 2019 19:41

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