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An analysis tool for design and certification of postbuckling composite aerospace structures

Orifici, Adrian and Thomson, R.S. and Degenhardt, Richard (2008) An analysis tool for design and certification of postbuckling composite aerospace structures. In: Proceedings of the 2nd International Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures. 2nd International Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures, 2008-09-03 - 2008-09-05, Braunschweig, Deutschland.

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Abstract

An experimental and numerical investigation was performed into the damage mechanisms and failure loads in skinstiffener sections. In the experimental investigation, thin strips consisting of a skin and single stiffener were cut from a range of various fuselage-representative panels. There were seven panel designs, which involved changes in geometry, lay-up, material, stiffener shape and the use of co-curing or secondary bonding to join the skin and stiffener. A total of 203 thin strip sections were cut from these panels and tested to failure. The sections were loaded in two test rigs that aimed to simulate the various symmetric and antisymmetric loads on skin-stiffener interfaces in a postbuckling panel. Five failure modes were observed, corresponding to the first damage event occurring at different locations: stiffener bend, stiffener blade, core region under the stiffener, flange edge, and skin. In general, there was good repeatability of the experimental results, particularly when classified according to failure mode, though there was a significant degree of variability in some results. For the numerical analysis, two-dimensional finite element models were analysed, and strength criteria applied in order to predict the initiation of interlaminar damage. In general, the numerical predictions gave good comparison with the experiment in terms of the critical damage locations and initiation loads, which were within the experimental scatter. Discussion is given on the sensitivity of the specimen designs, and how the twodimensional analysis approach has been applied to large fuselage-representative structures.

Document Type:Conference or Workshop Item (Speech)
Title:An analysis tool for design and certification of postbuckling composite aerospace structures
Authors:
AuthorsInstitution or Email of Authors
Orifici, AdrianSchool of Aerospace, Mechanical and Manufacturing Engineering, Royal Melbourne Institute of Technology, GPO Box 2476V, Melbourne, Victoria 3001, Australia
Thomson, R.S.Cooperative Research Centre for Advanced Composite Structures (CRC-ACS) Limited, Fishermans Bend, VIC 3207, Australia
Degenhardt, RichardUNSPECIFIED
Date:September 2008
Journal or Publication Title:Proceedings of the 2nd International Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures
Editors:
EditorsEmail
DLR Braunschweig, UNSPECIFIED
Status:Published
Keywords:Postbuckling; stiffened panels; skin-stiffener interface; interlaminar damage
Event Title:2nd International Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures
Event Location:Braunschweig, Deutschland
Event Type:international Conference
Event Dates:2008-09-03 - 2008-09-05
Organizer:DLR Braunschweig, Institut für Faserverbundleichtbau und Adaptronik
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Doris Ries
Deposited On:09 Sep 2008
Last Modified:27 Apr 2009 15:12

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