On the mixed Mode II/III fatigue threshold behaviour for aluminium alloys 2014-T6 and 7075-T6

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DOIResolve DOI: http://doi.org/10.1111/j.1460-2695.2011.01560.x
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TypeArticle
Journal titleFatigue & Fracture of Engineering Materials & Structures
Volume35
Issue1
Pages212; # of pages: 11
Subjectaerospace structures; aluminium alloys 2014-T6 and 7075-T6; mixed mode fatigue; Mode II loading; Mode III loading; threshold stress intensity factor range; mixed mode II/III; fatigue threshold; crack growth
AbstractThis paper describes an investigation into the fatigue threshold behaviour of two structural aluminium aerospace alloys, Al 2014-T6 and Al 7075-T6, when subjected to Mode II, Mode III and mixed Mode II/III loading. A unique four-point shear loading test rig was employed to cyclically load sharply edge-notched square bar specimens using an increasing load technique. The main aim of the work has been to generate Mode II–Mode III interaction diagrams for the fatigue threshold in each case, in order to facilitate improved design procedures for components fabricated from these alloys, which are susceptible to fatigue cracking under predominantly shear type loading. Aircraft are subjected to structural loads consisting of: pressurization, tension/compression, bending, shear and torsion, both on the ground and in flight. Representative fatigue fracture surfaces have been examined using scanning electron microscopy.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedNo
NPARC number19726595
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Record identifier274a11f8-fd51-4853-b53d-458e69cdca93
Record created2012-03-26
Record modified2016-05-09
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