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Biaxial Fatigue of Laser Beam and Friction Stir Welded Components

Biallas, Gerhard und Sick, Christian und Schneider, Janine und Trautmann, Karl-Heinz und Alléhaux, Delphine und Marie, Francois und Troiano, Giovanni (2007) Biaxial Fatigue of Laser Beam and Friction Stir Welded Components. European Workshop on “Development of Short Distance Welding Concepts for Airframes (WEL-AIR)”, 2007-06-13 - 2007-06-15, Geesthacht.

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Kurzfassung

Cruciform specimens made from both FSW T-joints produced by EADS in Suresnes and LBW T-joints delivered by Alenia were fatigued in the DLR biaxial test rig. To resemble the loading situation of stiffened fuselage structures, proportional loading without any phase shift, but with different load ratios between the loading components in both directions was applied. Regardless of the welding process and the biaxial load ratio applied, natural crack initiation and subsequent crack growth were governed by the sharp stiffness gradient caused by introducing the stringer. Cracks initiated and propagated at run-in and run-out locations in a direction perpendicular to the weld seam. The shortest fatigue life was observed for uniaxial loading in stringer direction. An additional stress component perpendicular to the joint line reduced deformation in welding direction before crack initiation and diminished crack opening at maximum load after crack initiation both resulting in a higher number of cycles to failure. Characteristics of a crack propagating from a saw-cut along the weld seam were not markedly deteriorated as compared to crack growth in the base material. Similar to single stringer panels, increasing the load ratio also increased the number of cycles to failure for FSW clip-stringer structural members, but additionally gives a different location of the fatal crack.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Biaxial Fatigue of Laser Beam and Friction Stir Welded Components
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Biallas, GerhardNICHT SPEZIFIZIERT
Sick, ChristianNICHT SPEZIFIZIERT
Schneider, JanineNICHT SPEZIFIZIERT
Trautmann, Karl-HeinzNICHT SPEZIFIZIERT
Alléhaux, DelphineEADS Innovation Works, Suresnes
Marie, FrancoisEADS Innovation Works, Suresnes
Troiano, GiovanniAlenia Aeronautica, Pomigliano d'Arco
Datum:2007
Status:veröffentlicht
Stichwörter:Friction stir welding, FSW, AA2024, biaxial loading, fatigue
Veranstaltungstitel:European Workshop on “Development of Short Distance Welding Concepts for Airframes (WEL-AIR)”
Veranstaltungsort:Geesthacht
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-06-13 - 2007-06-15
Veranstalter :GKSS Research Center
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen & Werkstoffe
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Werkstoffmechanische Prüfung
Hinterlegt von: Dr.-Ing. Gerhard Biallas
Hinterlegt am:10 Jan 2008
Letzte Änderung:27 Apr 2009 14:37

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