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Crack propagation in tailored welded blanks joined by friction stir welding

Schwinn, Julian und Besel, Michael und Alfaro Mercado, Ulises (2014) Crack propagation in tailored welded blanks joined by friction stir welding. International Conference on Fatigue Damage of Structural Materials X, 2014-09-21 - 2014-09-26, Hyannis, MA, USA.

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Kurzfassung

Tailored Welded Blanks (TWB) offer utilization of material properties appropriate to loading conditions in structural parts and thus provide high potential for weight savings. Friction stir welding (FSW) is generally accepted as a joining method with minimal negative effects on the mechanical properties of high strength aluminum alloys. For aircraft applications in particular fatigue properties and crack growth behavior are important design criteria and therefore have to be studied. AlMgSc-sheets of different thicknesses were joined by FSW to provide TWBs with a pronounced thickness transition. As cutting of FSW joints usually affects residual stresses, single edge notch tension (SENT) specimens were used to study crack propagation behavior in full size FSW TWB as applied in this work. Crack propagation tests were performed for base metal as well as FSW TWBs. Local stress intensity factors (SIF) were calculated using 3D finite element models. Non-uniform displacements of the clamping devices during fatigue experiments were measured with an optical deformation measurement system. Subsequently, these data were used to define realistic boundary conditions in the corresponding simulations. Residual stresses along the crack path and associated distortions of the FSW TWB were measured using the cut compliance method and the optical deformation measurement system. The resulting stress fields were used to calculate corrected SIFs and to study their effect on crack propagation under fatigue loading. The thickness transition in TWBs accounts for locally reduced SIFs resulting in decreased crack propagation rates. Non-uniform displacements of the clamps during SENT specimen testing additionally affect the SIFs. The consideration of these geometrical and experimental features in the 3D simulations in combination with residual stress and distortion allows for the determination of crack propagation rates as a function of SIFs. Finally, crack propagation under fatigue loading can be studied for TWBs with various thickness transitions.

elib-URL des Eintrags:https://elib.dlr.de/91223/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Crack propagation in tailored welded blanks joined by friction stir welding
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schwinn, Julianjulian.schwinn (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Besel, Michaelmichael.besel (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Alfaro Mercado, Ulisesulises.alfaro (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:25 September 2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Weld effects, Linear elastic fracture mechanics, Friction Stir Welding, Residual Stress
Veranstaltungstitel:International Conference on Fatigue Damage of Structural Materials X
Veranstaltungsort:Hyannis, MA, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:21 September 2014
Veranstaltungsende:26 September 2014
Veranstalter :Elsevier
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen und Werkstoffe (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Metallische Strukturen und hybride Werkstoffsysteme
Hinterlegt von: Schwinn, Julian
Hinterlegt am:04 Nov 2014 14:47
Letzte Änderung:24 Apr 2024 19:57

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