Metallurgical and Materials Transactions A

, Volume 39, Issue 10, pp 2370–2377 | Cite as

Evolution of Residual Stresses with Fatigue Crack Growth in a Variable Polarity Plasma Arc–Welded Aluminum Alloy Compact Tension Specimen

  • C.D.M. Liljedahl
  • O. Zanellato
  • L. Edwards
  • M.E. Fitzpatrick
Article
First Online:

Abstract

The evolution of the residual stresses during fatigue crack growth in a welded compact tension C(T) specimen was measured using neutron diffraction. The measurements were performed by growing a fatigue crack in a sample in situ on a neutron diffractometer. The stresses were found to be unaffected by crack growth through the compressive part of the initial residual stress field. The residual stresses at the crack tip increased when the crack entered the tensile residual stress field to maintain residual stress equilibrium. Finite element (FE) modeling of the evolution of the residual stresses showed good correlation with the experimental results. The residual stress evolution was found to be governed by redistribution of the initial stress field and only slightly affected by fatigue-induced effects at the measured spatial resolution (2 mm × 2 mm × 7 mm).

Keywords

Residual Stress Crack Length Fatigue Crack Growth Neutron Diffraction Crack Closure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The authors gratefully acknowledge the instrument scientist, Dr. Ed Olivier, at the ENGIN-X diffractometer at ISIS, and Mr. Peter Ledgard for manufacturing of the fatigue grips.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2008

Authors and Affiliations

  • C.D.M. Liljedahl
    • 1
  • O. Zanellato
    • 1
  • L. Edwards
    • 1
    • 2
  • M.E. Fitzpatrick
    • 1
  1. 1.Materials EngineeringThe Open UniversityMilton KeynesUnited Kingdom
  2. 2.Australian Nuclear Science and Technology Organisation, PMB1MenaiAustralia

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