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Coupling of X-ray CT and surface in-situ analysis combined with DIC method to study low cycle fatigue damage micromechanisms in lost foam casting A319 alloy
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  • Long WANG,
  • Nathalie Limodin,
  • Ahmed El Bartali,
  • Eric Charkaluk
Long WANG
Univ. Lille, CNRS, Centrale Lille, UMR 9013 - LaMcube - Laboratoire de Mécanique, Multiphysique, Multi-échelle, F-59000 Lille, France
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Nathalie Limodin
Univ. Lille, CNRS, Centrale Lille, UMR 9013 - LaMcube - Laboratoire de Mécanique, Multiphysique, Multi-échelle, F-59000 Lille, France
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Ahmed El Bartali
Univ. Lille, CNRS, Centrale Lille, UMR 9013 - LaMcube - Laboratoire de Mécanique, Multiphysique, Multi-échelle, F-59000 Lille, France
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Eric Charkaluk
Univ. Lille, CNRS, Centrale Lille, UMR 9013 - LaMcube - Laboratoire de Mécanique, Multiphysique, Multi-échelle, F-59000 Lille, France
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Abstract

An experimental protocol has been set up in order to study the Low Cycle Fatigue (LCF) damage micromechanisms in a Lost Foam Casting (LFC) A319 alloy at room temperature. The microstructure of the studied material was characterized by using X-ray Computed Tomography (X-ray CT) prior to the LCF tests performed with surface in-situ observations, which allow crack initiation and propagation being tracked in real-time. The mechanical fields measured by Digital Image Correlation (DIC) method allowed establishing the relations between strain localizations, damage evolutions and microstructure while a developed etching method, which gives a natural texture to the surface, makes DIC feasible to an acceptable resolution without masking the microstructure. The results showed that crack initiation is ascribed to strain localizations induced by large pore and/or the propagation of a previously nucleated crack. Cracks propagate along hard inclusions but the orientation of hard inclusions has also an influence on crack path.

Peer review status:UNDER REVIEW

15 Sep 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
15 Sep 2020Assigned to Editor
15 Sep 2020Submission Checks Completed
16 Sep 2020Reviewer(s) Assigned
21 Sep 2020Review(s) Completed, Editorial Evaluation Pending