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Cost-efficient testing of highly loaded fatigue cracks in aerospace alloys under realistic fuselage loading conditions supported by intelligent algorithms

Breitbarth, Eric und Strohmann, Tobias und Requena, Guillermo (2021) Cost-efficient testing of highly loaded fatigue cracks in aerospace alloys under realistic fuselage loading conditions supported by intelligent algorithms. 32nd Advanced Aerospace Materials and Processes (AeroMat) Conference, 24.-26. Mai 2021, online, Canada.

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Kurzfassung

Accurate lifetime estimations of lightweight aircraft structures are crucial for safety and economic reasons. Fatigue cracks are likely to occur in the fuselage owing to non-constant service loads, wall thickness below 2 mm and stresses higher than 100 MPa. The presence of such cracks is included in the design of aircraft structures but their behaviour must be well understood to implement reliable damage tolerance concepts. In this work uniaxial and biaxial tests are used to study propagation of fatigue crack with lengths > 300 mm and stress intensity factors of over 100 MPa√m in rolled AA2024 and AA5028 sheets with thickness of 1.6 mm and 1.8 mm. Large biaxial and uniaxial tests specimens with dimensions of 2098 x 1734 mm² and 1290 x 950 mm² were investigated. The tests were supported by an in situ 3D digital image correlation (DIC) system to obtain full-field strain and displacement information on the surface during crack propagation. A DIC-based system was developed to determine the crack path with a pre-trained convolutional neuronal network. The results obtained were then used to compute the actual crack tip loading K_I/K_II with the help of a post-processor based on the interaction integral. The crack propagation curves, da/dN-ΔK, could be determined with stable crack propagation rates of more than 1 mm/cycle and ΔK > 100 MPa√m. The combination of classical testing methods with digital evaluation algorithms presented in this work enable new insights into the fracture mechanics behaviour of large fatigue cracks.

elib-URL des Eintrags:https://elib.dlr.de/145844/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Cost-efficient testing of highly loaded fatigue cracks in aerospace alloys under realistic fuselage loading conditions supported by intelligent algorithms
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Breitbarth, EricEric.Breitbarth (at) dlr.dehttps://orcid.org/0000-0002-3479-9143NICHT SPEZIFIZIERT
Strohmann, TobiasTobias.Strohmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Requena, GuillermoGuillermo.Requena (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:24 Mai 2021
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Fatigue crack growth; digital image correlation; biaxial testing
Veranstaltungstitel:32nd Advanced Aerospace Materials and Processes (AeroMat) Conference
Veranstaltungsort:online, Canada
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:24.-26. Mai 2021
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Komponenten und Systeme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L CS - Komponenten und Systeme
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturwerkstoffe und Bauweisen
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Metallische Strukturen und hybride Werkstoffsysteme
Hinterlegt von: Breitbarth, Eric
Hinterlegt am:24 Nov 2021 10:31
Letzte Änderung:24 Nov 2021 10:31

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