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COCOMATCOCOMAT COCOMAT Improved MAT erial Exploitation at Safe Design of CO mposite Airframe Structures by Accurate Simulation of CO llapse funded by the.

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Presentation on theme: "COCOMATCOCOMAT COCOMAT Improved MAT erial Exploitation at Safe Design of CO mposite Airframe Structures by Accurate Simulation of CO llapse funded by the."— Presentation transcript:

1 COCOMATCOCOMAT COCOMAT Improved MAT erial Exploitation at Safe Design of CO mposite Airframe Structures by Accurate Simulation of CO llapse funded by the European Community COCOMAT

2 COCOMATCOCOMAT COCOMAT contributes to this aim by: Instrument: Specific Targeted REsearch Project (STREP) Priority 4: Aeronautics and Space Work Programme: Area: Strengthening competitiveness Objective: Reduction of aircraft development and operating costs by 20% and 50% in the short and long term, respectively. Goal: Reducing structural weight at safe design by exploitation of considerable reserves in primary fibre composite fuselage structures by accurate simulation of collapse Integrating and strengthening the European Research Area COCOMAT contributes to this aim by: Instrument: Specific Targeted REsearch Project (STREP) Priority 4: Aeronautics and Space Work Programme: Area: Strengthening competitiveness Objective: Reduction of aircraft development and operating costs by 20% and 50% in the short and long term, respectively. Goal: Reducing structural weight at safe design by exploitation of considerable reserves in primary fibre composite fuselage structures by accurate simulation of collapse The EC 6th Framework Programme

3 COCOMATCOCOMAT POSICOSS and COCOMAT - Interaction Improved POstbuckling SImulation for Design of Fibre COmposite Stiffened Fuselage Structures Improved MATerial Exploitation at Safe Design of COmposite Airframe Structures by Accurate Simulation of COllapse Year POSICOSS (FP 5) COCOMAT (FP 6, STREP)

4 COCOMATCOCOMAT Consortium IL E B D I D SMEs Research establishments Universities Large industries I GR PL CH AUS D LV IL S

5 COCOMATCOCOMAT Structures considered Next generation – All composite fuselage structure COCOMAT considers curved CFRP panels which are understood as parts of a fuselage section.

6 COCOMATCOCOMAT What is collapse? Scale factor: 10 Scale factor: 8 Scale factor: 5 Scale factor: 3 1 st global (stringer- based) buckling 1 st local buckling Scale factor: 5 Shortening Load Real curve Collapse load Simplified curve Shortening Load Real curve (Example: Axially compressed curved stiffened CFRP panel)

7 COCOMATCOCOMAT Overall Objective Current design scenario Shortening Load I II III Not allowed Collapse Load (CL) First Buckling Load (1. BL) Safety region Allowed under operating flight conditions degradation (OD) Onset of OD Limit Load (LL) Ultimate Load (UL) UL

8 COCOMATCOCOMAT Work plan WP 1: Benchmarking on collapse analysis of undamaged and damaged structures with existing tools WP 2: Material characterisation, damage investigation and design of structures for static and cyclic tests WP 3: Development of improved simulation procedures for collapse WP 4: Manufacture, inspection and testing by static and cyclic loading of undamaged panels from WP2 WP 5: Manufacture, inspection and testing by static and cyclic loading of pre-damaged panels from WP2 WP 6: Design guidelines and industrial validation

9 COCOMATCOCOMAT Design guidelines Main objective Main results Experimental data base Slow certification tools and fast design tools Future design scenario Main results C O C O M A T

10 COCOMATCOCOMAT Benefit oResults transferable to other airframe structures oContribution to Reduced development and operating costs, by 20% and 50% in the short and long term, respectively. oImprovements in competitiveness of future European aircraft oTraditional aircraft design can be replaced by an advanced procedure including degradation models for composite structures oReduced design and analysis time oConsiderably reduced structural weight at safety not impaired oSubstantially improved response-to-market time

11 COCOMATCOCOMAT © 2006 Produced by Cine Visa Braunschweig Tel Fax Grafik: Johanna Hasse By order of DLR (German Aerospace Center) Institute of Composite Structures and Adaptive Systems Director: Prof. Dr.-Ing. habil. Elmar Breitbach Department Structural Mechanics Head: Dr.Ing. Jan Tessmer Co-ordinator COCOMAT Dr.-Ing. Richard Degenhardt, DLR Production team: Dr.-Ing. Richard Degenhardt, DLR Prof. Klaus Rohwer, DLR Dr. Rolf Zimmermann, DLR Dirk Wilckens Doris Ries, DLR Cine Visa Film and Video


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