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Development of fatigue cracks from mechanically machined scratches on 2024-T351 aluminium alloy - part I: experimentation and fractographic analysis

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dc.affiliation.dptoUC3M. Departamento de Bioingenieríaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería Aeroespaciales
dc.contributor.authorCini, Andrea
dc.contributor.authorP.E., Irving
dc.date.accessioned2024-02-07T19:03:33Z
dc.date.available2024-02-07T19:03:33Z
dc.date.issued2017-05-01
dc.description.abstractClad and unclad 2024-T351 alumini um alloy sheets, weakened by mechanically machined scratches, were fatigued to investigate the effect of small surface damage, like scribe marks, on aircraft fuselage joints. The role of scratch cross section geometry on fatigue life of scribed components was analysed. Scratches between 25 and 185 mum deep, with 5, 25 and 50 mum root radii, were cut on sample surface by using diamond-tipped tools. After testing, fracture surfaces were examined using a scanning electron microscope, and crack growth rates were measured by striation counting. Scratches reduced aluminium fatigue life under tensile and bending load up to 97.8% due to multiple crack nucleation at their roots. Short cracks nucleated from sharp scratches coalesced to formunique elongated cracks growing through sample thickness. Cracks initiated fromscratches were typical short cracks, growing faster than conventional long cracks. Despite the different scribing process, fatigue data of regular diamond tool cut scribes can be used to conservatively predict life reduction owing to ploughed in-service scribe marks on fuselage joints. Finite element analyses on scribed samples and the fatigue life prediction models are described in Part II of this paper.en
dc.description.sponsorshipThis research activity was funded by Airbus. The support of Dr Domenico Furfari from Airbus in providing the research group with samples as well of Mr Ben Hopper from Cranfield University in scribing specimens is gratefully acknowledged.en
dc.format.extent14
dc.identifier.bibliographicCitationCini, A., and Irving, P.E. (2017). Development of fatigue cracks from mechanically machined scratches on 2024-T351 aluminium alloy—part I: experimentation and fractographic analysis. Fatigue Fract Engng Mater Struct, 40 (5), (776–789). https://doi.org/10.1111/ffe.12544en
dc.identifier.doihttps://doi.org/10.1111/ffe.12544
dc.identifier.issn8756758X (ISSN)
dc.identifier.publicationfirstpage776
dc.identifier.publicationissue5
dc.identifier.publicationlastpage789
dc.identifier.publicationtitleFatigue and Fracture of Engineering Materials and Structuresen
dc.identifier.publicationvolume40
dc.identifier.urihttps://hdl.handle.net/10016/39951
dc.identifier.uxxiAR/0000026373
dc.language.isoengen
dc.publisherWileyen
dc.rights© 2016 Wiley Publishing Ltd.en
dc.rights.accessRightsopen accessen
dc.subject.ecienciaAeronáuticaes
dc.subject.ecienciaBiología y Biomedicinaes
dc.subject.otherFractographyen
dc.subject.otherNotch fatigueen
dc.subject.otherScratches and scribe marksen
dc.subject.otherSmall cracksen
dc.subject.otherStriationsen
dc.titleDevelopment of fatigue cracks from mechanically machined scratches on 2024-T351 aluminium alloy - part I: experimentation and fractographic analysisen
dc.typeresearch articleen
dc.type.hasVersionAMen
dspace.entity.typePublication
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