Development of fatigue cracks from mechanically machined scratches on 2024-T351 aluminum alloy - Part 1: experimentation and fractographic analysis

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dc.contributor.authorCini, Andrea
dc.contributor.authorIrving, Phil E.
dc.date.accessioned2016-12-06T12:45:21Z
dc.date.available2016-12-06T12:45:21Z
dc.date.issued2016-10-27
dc.description.abstractClad and unclad 2024-T351 aluminium 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 µm deep, with 5, 25 and 50 µm 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 form unique elongated cracks growing through sample thickness. Cracks initiated from scratches 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_UK
dc.identifier.citationCini, A., and Irving, P. E. (2016) Development of fatigue cracks from mechanically machined scratches on 2024-T351 aluminium alloy—part I: experimentation and fractographic analysis. Fatigue and Fracture of Engineering Materials and Structures, Volume 40, Issue 5, 2017, pp. 776-789en_UK
dc.identifier.issn8756-758X
dc.identifier.urihttp://dx.doi.org/10.1111/ffe.12544
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/11089
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution-NonCommercial 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectNotch fatigueen_UK
dc.subjectscratches and scribe marksen_UK
dc.subjectsmall cracksen_UK
dc.subjectfractographyen_UK
dc.subjectstriationsen_UK
dc.titleDevelopment of fatigue cracks from mechanically machined scratches on 2024-T351 aluminum alloy - Part 1: experimentation and fractographic analysisen_UK
dc.typeArticleen_UK

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