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INVESTIGATIONS ON ALIMUNIUM-LITHIUM ALLOYS FOR DAMAGE TOLERANT APPLICATION

Objective


The properties of Al-Li alloys have been evaluated against the needs of the aircraft industry, and compared with the properties of the 2024-T3 alloy used for aircraft parts today.

Further studies need to be done on the mechanics and physics of fatigue crack growth, to quantitatively account for peak load interactions.
New aluminium-litium alloys offer aircraft manufacturers considerable weight saving potential without extensive conversion of their manufacturing facilities.

At present the main material used for civil aircraft structures is the conventional alloy 2024 T3 because of its excellent damage tolerant behaviour. Al-Li alloys becoming available do not cover the whole range of properties required by the aircraft industry in respect of damage tolerance.

A priority of the programme is to identify the weak points of the existing materials and to define procedures for improvements.

A further increase in attractiveness and cost-efficiency for future use of the material will be possible when a naturally aged alloy becomes available instead of the artificially aged alloy.

Another priority is the understanding and evaluation of specific behaviours of the now available alloys which are specific to Al-Li and mainly unkwon today. Special items such as corrosion, fracture toughness, flight simulation and component tests have to be solved.

Coordinator

Deutsche Aerospace Airbus GmbH
Address
Hünefeldstraße 1-5
28199 Bremen
Germany

Participants (10)

Aérospatiale Société Nationale Industrielle SA
France
Address
37 Boulevard De Montmorency
75781 Paris
British Aerospace Defence Ltd
United Kingdom
Address
Warton Aerodrome
PR4 1AX Preston
Cegedur SA
France
Address
23 Rue De Balzac
75008 Paris
Construcciones Aeronauticas SA
Spain
Address
Avd John Lennon S/n
28906 Getafe
Dassault Aviation SA
France
Address
78 Quai Marcel Dassault
92214 Saint-cloud
Dornier Luftfahrt GmbH
Germany
Address
An Der Bundesstraße 31
88039 Friedrichshafen
Fokker Aircraft BV
Netherlands
Address
Hoogoorddreef 15
1100 AE Amsterdam
Secretary of State for Defence
United Kingdom
Address

GU14 0LS Pyestock, Hampshire
Stichting Nationaal Lucht en Ruimte-vaartlaboratorium
Netherlands
Address
90502
1006 BM Amsterdam
University of Patras
Greece
Address

26002 Patrai