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Simulating Postbuckling Behaviour and Collapse of Stiffened CFRP Panels

Rohwer, Klaus und Degenhardt, Richard (2007) Simulating Postbuckling Behaviour and Collapse of Stiffened CFRP Panels. NAFEMS World Congress 2007, 2007-05-22 - 2007-05-25, Vancouver, Kanada.

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Kurzfassung

Advanced composite materials are well known for their outstanding potential in weight-related stiffness and strength leading to an ever increasing share in aerospace structural components out of Carbon Fibre Reinforced Plastics (CFRP). In order to fully exploit the load-carrying capacity of such structures an accurate and reliable simulation is indispensable. Local buckling is not necessarily the load bearing limit for stiffened panels or shells; their full potential can be tapped only by utilizing the postbuckling region. That, however, requires fast tools which are capable of simulating the structural behaviour beyond bifurcation points including material degradation up to collapse. The most critical structural degradation mode is skin stringer separation; delamination, especially within the stringer, is a critical material degradation. A reliable prediction of collapse requires knowledge of degradation due to static as well as low cycle loading in the postbuckling region. Earlier projects have shown that it needs considerable experience in simulating the postbuckling behaviour. Though a great deal of knowledge about CFRP structural and material degradation is available its influence on collapse is not yet sufficiently investigated. It is the aim of the project COCOMAT (Improved MATerial exploitation at safe design of COmposite airframe structures by accurate simulation of COllapse) to develop means for and gain experience in fast and accurate simulation of the collapse load of stringer stiffened CFRP curved panels taking degradation and cyclic loading as well as geometric nonlinearity into account. COCOMAT is a Specific Targeted Research Project supported by the EU 6th Framework Programme; it started 2004 and runs for 4 years. Main deliverables are: • test results for buckling and collapse of undamaged and pre-damaged stiffened CFRP panels under static and cyclic loading, • improved material properties and degradation models, computational tools for design and certification of stiffened fibre composite panels which take postbuckling behaviour, degradation and collapse into account, • and finally design guidelines and industrial validation. The work will lead to an extended experimental data base, relevant degradation models and improved simulation tools for certification as well as for design. These results should allow setting up a future design scenario which exploits the existing reserves in primary fibre composite structures. The paper starts out from results provided by the forerunners of COCOMAT, describes the main objectives of the project, gives a general status of the progress reached so far and presents first results.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Simulating Postbuckling Behaviour and Collapse of Stiffened CFRP Panels
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Rohwer, KlausNICHT SPEZIFIZIERT
Degenhardt, RichardNICHT SPEZIFIZIERT
Datum:Mai 2007
Stichwörter:CFRP, stiffness, buckling, collapse, COCOMAT
Veranstaltungstitel:NAFEMS World Congress 2007
Veranstaltungsort:Vancouver, Kanada
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-05-22 - 2007-05-25
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen & Werkstoffe
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Strukturmechanik
Hinterlegt von: Doris Ries
Hinterlegt am:31 Okt 2007
Letzte Änderung:12 Dez 2013 20:26

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