Laboratory apparatus for in-situ corrosion fatigue testing and characterisation of fatigue cracks using X-ray micro-computed tomography

Farnoosh Farhad, David Smyth-Boyle, Xiang Zhang, Ian Wallis, Dorathy Panggabean

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1 Citation (Scopus)
16 Downloads (Pure)

Abstract

This paper presents the design, construction and assembly of laboratory apparatus to undertake in-situ corrosion fatigue tests in a sour corrosive environment under uniaxial fatigue loading. The bespoke test cell allows periodic non-destructive X-ray micro-computed tomography of the specimen in-situ during fatigue testing and thus enables monitoring of material degradation as it progresses and in particular the pit-to-crack transition. This approach provides more direct information on crack initiation than complementary ex-situ techniques such as Scanning Electron Microscopy (SEM) of post-test metallographic specimens. Moreover, the apparatus was designed to allow a fatigue cycle to be interrupted and maintain the sample under static tensile load, during X-ray tomography scans. This process reduced the risk of premature crack closure during interrupted tests. Results presented herein demonstrate the performance and reliability of our approach and will hopefully stimulate other groups to employ similar ‘lab-scale’ initiatives.
Original languageEnglish
Pages (from-to)2629-2637
Number of pages9
JournalFatigue and Fracture of Engineering Materials and Structures
Volume41
Issue number12
Early online date25 Jun 2018
DOIs
Publication statusPublished - Dec 2018

Bibliographical note

This is the peer reviewed version of the following article: Farhad, F, Smyth-Boyle, D, Zhang, X, Wallis, I & Panggabean, D 2018, 'Laboratory apparatus for in-situ corrosion fatigue testing and characterisation of fatigue cracks using X-ray micro-computed tomography' Fatigue and Fracture of Engineering Materials and Structures, vol 41:12, pp. 2629-2637, which has been published in final form at https://dx.doi.org/10.1111/ffe.12873
This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Keywords

  • Fatigue crack initiation
  • Pitting corrosion
  • Corrosion fatigue experiment
  • Crack monitoring
  • Environmental technique

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