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

COCOMAT

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

COCOMAT

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

COCOMAT

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)

2000 2001 2006 200720052002 2003 2004

COCOMAT

Consortium

IL

E

B

D

I

D

SMEsResearch

establishmentsUniversities

Large industries

I

GR

PL CH AUS

D

LV

IL S

COCOMAT

Structures considered

Next generation – All composite fuselage structure

COCOMAT considers curved CFRP panels which are understood as parts of a fuselage section.

COCOMAT

What is collapse?

Scale factor: 10

Scale factor: 8

Scale factor: 5

Scale factor: 3

1st global (stringer-based) buckling

1st local buckling

Scale factor: 5

Shortening

Lo

ad

Real curve

Collapse load

Simplified curve

Shortening

Lo

ad

Real curve

(Example: Axially compressed curved stiffened CFRP panel)

COCOMAT

Overall Objective

Current design scenario

Shortening

Load

I

II

IIINot allowed

Collapse Load (CL)

First Buckling Load (1. BL)

Safety region

Allowed under operating flight conditions

degradation (OD)Onset of

OD

Load

Future design scenario

1. BL

CL

LL

Shortening

III

I

II

Limit Load (LL)

Ultimate Load (UL)

UL

COCOMAT

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

Year 20072004 2005 2006

COCOMAT

Design guidelines

Ma

in

ob

jec

tiv

e

Main results

Experimental data base Slow certification tools

and fast design tools

Future design scenario

Ma

in r

es

ult

s

C O C O M A T

COCOMAT

Benefit

o Results transferable to other airframe structures

o Contribution to Reduced development and operating costs, by

20% and 50% in the short and long term, respectively.

o Improvements in competitiveness of future European aircraft

o Traditional aircraft design can be replaced by an advanced

procedure including degradation models for composite structures

o Reduced design and analysis time

o Considerably reduced structural weight at safety not impaired

o Substantially improved response-to-market time

COCOMAT

© 2006

Produced by

Cine Visa 38102 BraunschweigTel. +49 531 2702010Fax. +49 531 [email protected]

Grafik: Johanna Hasse

By order of

DLR (German Aerospace Center)Institute of Composite Structures and Adaptive SystemsDirector: Prof. Dr.-Ing. habil. Elmar Breitbach

Department Structural MechanicsHead: Dr.Ing. Jan Tessmer

Co-ordinator COCOMATDr.-Ing. Richard Degenhardt, DLR

Production team:

Dr.-Ing. Richard Degenhardt, DLRProf. Klaus Rohwer, DLRDr. Rolf Zimmermann, DLRDirk WilckensDoris Ries, DLRCine Visa Film and Video

www.cocomat.de