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Blunt Notch Strength of AA2024 3-3/2-0.4 Fibre Metal Laminate Under Biaxial Tensile Loading

Schwinn, Julian and Breitbarth, Eric and Beumler, Thomas and Requena, Guillermo (2019) Blunt Notch Strength of AA2024 3-3/2-0.4 Fibre Metal Laminate Under Biaxial Tensile Loading. Metals, 9(4) (413). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/met9040413 ISSN 2075-4701

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Fibre metal laminates are utilized in lightweight structures, such as aircraft fuselages, as fibre metal laminates provide outstanding fatigue and damage tolerance capabilities, together with a reduced weight compared to monolithic metallic structures. One critical feature of fuselage structures is their strength reduction that owes to riveting, i.e., a state-of-the-art joining technique in aircrafts. In the present work, the blunt notch strength of fibre-laminate panels with rivet holes is investigated under service-relevant biaxial loading conditions. To this purpose, cruciform specimens with a five-hole pattern were produced. These specimens were tested under various biaxiality ratios and fibre orientations. All tests were supported by three-dimensional digital image correlation to obtain the deformation field in the gauge area. Moreover, the displacement fields obtained during deformation were used in an elasto-plastic finite element model as boundary conditions to determine the maximum strains in the vicinity of the blunt notch holes and thus extend the application of the experimental results. The asymmetric strain fields obtained by digital image correlation reveal the interaction of the fibres with the blunt notch holes. Finally, it is shown that the biaxial loading conditions do not significantly influence the blunt notch strength.

Item URL in elib:https://elib.dlr.de/127277/
Document Type:Article
Title:Blunt Notch Strength of AA2024 3-3/2-0.4 Fibre Metal Laminate Under Biaxial Tensile Loading
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwinn, JulianJulian.Schwinn (at) dlr.deUNSPECIFIED
Breitbarth, EricEric.Breitbarth (at) dlr.dehttps://orcid.org/0000-0002-3479-9143
Beumler, Thomasthomas.beumler (at) airbus.comUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Date:5 April 2019
Journal or Publication Title:Metals
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/met9040413
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:fibre metal laminate; blunt notch strength; biaxial testing; finite element
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
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Breitbarth, Eric
Deposited On:20 May 2019 13:31
Last Modified:14 Dec 2019 04:22

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