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

Journal Article


Abstract


  • This 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. © 2011 Blackwell Publishing Ltd.

Publication Date


  • 2012

Citation


  • Merati, A. A., Hellier, A. K., & Zarrabi, K. (2012). On the mixed Mode II/III fatigue threshold behaviour for aluminium alloys 2014-T6 and 7075-T6. Fatigue and Fracture of Engineering Materials and Structures, 35(1), 2-12. doi:10.1111/j.1460-2695.2011.01560.x

Scopus Eid


  • 2-s2.0-84855332800

Start Page


  • 2

End Page


  • 12

Volume


  • 35

Issue


  • 1

Abstract


  • This 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. © 2011 Blackwell Publishing Ltd.

Publication Date


  • 2012

Citation


  • Merati, A. A., Hellier, A. K., & Zarrabi, K. (2012). On the mixed Mode II/III fatigue threshold behaviour for aluminium alloys 2014-T6 and 7075-T6. Fatigue and Fracture of Engineering Materials and Structures, 35(1), 2-12. doi:10.1111/j.1460-2695.2011.01560.x

Scopus Eid


  • 2-s2.0-84855332800

Start Page


  • 2

End Page


  • 12

Volume


  • 35

Issue


  • 1