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Future Structural stability Design for Composite space and Airframe Structures

Degenhardt, Richard (2011) Future Structural stability Design for Composite space and Airframe Structures. 32th Iberian Latin American Congress on Computational Methods in Engineering (CILAMCE), 13.-16.Nov. 2011, Ouro Preto, Brazil.

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Official URL: http://www.acquacon.com.br/cilamce2011/en/index.php

Abstract

Space and aircraft industry demands for reduced development and operating costs. Structural weight reduction by exploitation of structural reserves in composite space and aerospace structures contributes to this aim, however, it requires accurate and experimentally validated stability analysis of real structures under realistic loading conditions. This paper presents different challenges and advances from the area of structural stability analysis of composite aerospace structures which contribute to that field. Thin-walled light weight structures endangered by buckling can be mainly divided into two groups: imperfection tolerant and imperfection sensitive structures. For both groups design guidelines for composites structures are still under development. This paper gives a short state-of-the-art and presents proposals for future design guidelines. Imperfection tolerant structures are for instance stiffened panels as used in aeronautic applications (e.g. fuselage or wing). They are characterised by a relatively large postbuckling area (load carrying capacity between maximum load and first, in most cases local buckling) which may be usually used for design. The maximum load is quite insensitive with respect geometrical or loading imperfections. The finished EU project COCOMAT investigated the postbuckling and collapse behaviour of this kind of structures. The running EU project MAAXIMUS builds up on these results and goes one step further to consider loads directly obtained from fuselage barrel level. This paper presents an overview about main COCOMAT results which demonstrates the potential of the postbuckling behaviour of stiffened CRFP panels and gives the strategy of the running MAAXIMUS project. Imperfection sensitive structures are for instance unstiffened structures or stiffened structures with a rather dominant skin compared to the stiffeners. For such structures the maximum load is equal or close to the first buckling load and is imperfection sensitive. These types of structures are commonly used in space applications. The currently applied design guidelines with respect to structural stability were developed only for metallic structures and are from 1968. For composites structures no guidelines exist. To fill this gap DLR developed a promising “Single Pertubation Approach” which promises high potential for a future application. The paper presents the approach, results as well as the challenges for the future.

Item URL in elib:https://elib.dlr.de/83810/
Document Type:Conference or Workshop Item (Speech)
Title:Future Structural stability Design for Composite space and Airframe Structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Date:2011
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Composite structures, Design, Buckling, Stability, Postbuckling, Collapse, Imperfection Sensitivity
Event Title:32th Iberian Latin American Congress on Computational Methods in Engineering (CILAMCE)
Event Location:Ouro Preto, Brazil
Event Type:international Conference
Event Dates:13.-16.Nov. 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics, Space
HGF - Program Themes:Aircraft Research (old), Space Transport
DLR - Research area:Aeronautics, Raumfahrt
DLR - Program:L AR - Aircraft Research, R RP - Raumtransport
DLR - Research theme (Project):L - Simulation & Validation (old), R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation, L - Structures & Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:10 Dec 2013 19:25
Last Modified:08 May 2014 23:24

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