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J-integral analysis: An EDXD and DIC comparative study for a fatigue crack

Koko, A; Earp, P; Wigger, T; Tong, J; Marrow, TJ; (2020) J-integral analysis: An EDXD and DIC comparative study for a fatigue crack. International Journal of Fatigue , 134 , Article 105474. 10.1016/j.ijfatigue.2020.105474. Green open access

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Abstract

Synchrotron Energy Dispersive X-ray Diffraction (EDXD) and Digital Image Correlation (DIC) have been applied to map simultaneously the 2D elastic strain and displacement fields of a propagating fatigue crack in the HAZ of a welded Cr2Ni4MoV bainitic steel. The position of the crack tip was tracked via a phase congruency analysis of the displacement field, and also by detection of its cyclic plastic zone. Both types of full field data provided independent inputs to finite element/J-integral analyses that directly quantified the elastic cyclic stress intensity factor range applied to the crack. No knowledge was required of the specimen geometry, crack length or applied loads. The agreement between the two analyses in this controlled study shows that strain mapping by synchrotron EDXD can provide a reliable method to study the crack fields in more complex problems, such as interactions between crack closure, residual stresses and applied loading.

Type: Article
Title: J-integral analysis: An EDXD and DIC comparative study for a fatigue crack
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijfatigue.2020.105474
Publisher version: https://doi.org/10.1016/j.ijfatigue.2020.105474
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Engineering, Mechanical, Materials Science, Multidisciplinary, Engineering, Materials Science, EDXD, DIC, Crack tip, J-integral, Finite element analysis, Fatigue crack growth, DIGITAL IMAGE CORRELATION, SYNCHROTRON, FIELD, DEFORMATION, PROPAGATION, MTEX
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10108771
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