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Improved Material Exploitation at Safe Design of Composite Airframe Structures by Accurate Simulation of Collapse

Objective

European aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. COCOMAT contributes to this aim by reducing structural weight at safe design; it exploits considerable reserves in primary fibre composite fuselage structures by accurate and reliable simulation of collapse. Collapse is specified by that point of the load-displacement-curve where a sharp decrease occurs thus limiting the load carrying capacity. Right now collapse of aircraft structures cannot be simulated with sufficient reliability, leading to over-conservative designs. More reliable determination requires knowledge of degradation due to static as well as low cycle loading in the post-buckling range. Improved slow and fast simulation tools as well as design guidelines for stiffened panels are needed which take skin stringer separation and material degradation into account. Reliable fast tools reducing design and analysis time by an order of magnitude, will allow for an economic design process, whereas very accurate but necessarily slow tools are required for the final certification. The project will deliver both types of tools, ready for industrial application. Industry brings in experience with design and manufacture of real shells; research contributes knowledge on testing and on development of simulation tools. Design guidelines are defined in common, and the developed tools are validated by industry. The results comprise a substantially extended data base on material properties and on collapse of undamaged and pre-damaged statically and low cyclically loaded structures, degradation models, improved slow and fast computation tools as well as design guidelines. The knowledge, the experience, the results and especially the fast tools of the running FP 5 project POSICOSS form an excellent basis for COCOMAT and allow to start work at a very high level. Urgent industrial need is manifested by involvement of eight companies.

Call for proposal

FP6-2002-AERO-1
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Coordinator

DEUTSCHES ZENTRUM FÜR LUFT UND RAUMFAHRT E.V.
Address
Linder Höhe
Köln
Germany

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Participants (14)

AGUSTA S.P.A.
Italy
Address
Via G. Agusta, 520
Samarate (Va)

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AERNNOVA ENGINEERING SOLUTIONS SA
Spain
Address
Parque Tecnologico De Alava C/leonardo Da Vinci, 13
Miñano (Álava)

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HELLENIC AEROSPACE INDUSTRY S.A.
Greece
Address
Hellenic Aerospace Industry, Po Box 23
Schimatari

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ISRAEL AIRCRAFT INDUSTRIES LTD.
Israel
Address
Ben Gurion International Airport
Lod

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WYTWORNIA SPRZETU KOMUNIKACYJNEGO PZL-SWIDNIK S.A.
Poland
Address
Al. Lotnikow Polskich 1
Swidnik

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SAMTECH S.A.
Belgium
Address
Rue Des Chasseurs-ardennais 8
Angleur (Liège)

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SMR SA
Switzerland
Address
Rue Dufour 109b
4014 Bienne

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ADVANCED COMPOSITE STRUCTURES LIMITED
Australia
Address
506 Lorimer Street
Fishermans Bend, Victoria

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SWEDISH DEFENCE RESEARCH AGENCY
Sweden
Address

Stockholm

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INSTITUT FUER BAUSTATIK, UNIVERSITAET KARLSRUHE
Germany
Address
Kaiserstrasse 12
6980 Karlsruhe

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POLITECNICO DI MILANO
Italy
Address
Piazza Leonardo Da Vinci, 33
Milano

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RIGA TECHNICAL UNIVERSITY
Latvia
Address
Kalku Iela 1
Riga

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RHEINISCH-WESTFAELISCHE TECHNISCHE HOCHSCHULE AACHEN
Germany
Address
Templergraben 55
Aachen

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TECHNION - ISRAEL INSTITUTE OF TECHNOLOGY
Israel
Address
Technion City
Haifa

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