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Fatigue crack deflection in cruciform specimens subjected to biaxial loading conditions

Breitbarth, Eric and Besel, Michael (2018) Fatigue crack deflection in cruciform specimens subjected to biaxial loading conditions. International Journal of Fatigue. Elsevier. DOI: 10.1016/j.ijfatigue.2018.04.021 ISSN 0142-1123

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Official URL: https://www.sciencedirect.com/science/article/pii/S0142112318301592


Crack deflection is studied for the aluminum alloys AA2024-T351 and AA5028-H116 under biaxial fatigue loading. With cruciform specimens that have a testing area of about 420 × 420 mm² a fatigue crack was subjected to nominal biaxiality ratios between 1.0 and 3.0. Consequently, the crack is subjected to different magnitudes of T-stress. Finite element simulations of the growing crack revealed that the crack path is not significantly influenced by the T-stress but the T-stress predicts whether the crack path remains stable. If at least two crack paths are basically possible the crack will kink for positive T-stresses and remain stable for negative T-stresses. Furthermore, small spikes with strain concentrations along the crack path are identified with digital image correlation which might cause crack deflection in this case.

Item URL in elib:https://elib.dlr.de/119914/
Document Type:Article
Title:Fatigue crack deflection in cruciform specimens subjected to biaxial loading conditions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Breitbarth, EricEric.Breitbarth (at) dlr.deUNSPECIFIED
Besel, Michaelmichael.besel (at) dlr.deUNSPECIFIED
Date:August 2018
Journal or Publication Title:International Journal of Fatigue
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijfatigue.2018.04.021
Keywords:Biaxial testing; Fatigue crack; Crack deflection; Aluminum; T-stress
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials, L - Simulation and Validation
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Breitbarth, Eric
Deposited On:08 Aug 2018 09:37
Last Modified:08 Aug 2018 09:37

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