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Detection of cracks in refractory materials by an enhanced digital image correlation technique

  • Ceramics
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Abstract

This paper is devoted to the study of the fracture behaviour of two industrial refractory materials thanks to the development of a new technique of digital image correlation (DIC). DIC, already known as a helpful and effective tool for the measurement of displacement and deformation fields in materials, has been adapted to take into account displacement discontinuities as cracks. The material transformation, usually assumed homogeneous inside each DIC subset, is thus more complex, while each subset can be cut in two parts with different kinematics. By this way, it is possible to automatically find the fracture paths and follow the crack geometries (length, opening) during the loading with a higher spatial resolution than the one obtained by standard DIC. After having presented the principle of the new technique, its metrological performances are assessed from synthetic images and the choice of crack detection criterion is discussed. The capacity of this new technique is shown through a comparative study with standard DIC. Its application is led on magnesia-spinel refractory materials, specifically to highlight and to characterize the evolution of kinematic fields (displacement and strain) observed at the surface of sample during a wedge splitting test typically used to quantify the work of fracture. We show that refractories with aggregates of iron aluminate spinel present a fracture mechanism with crack branching and can dissipate more energy thanks to a longer crack network.

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Acknowledgements

This study was conducted within the framework of FIRE (Federation of International Refractory Research and Education) Project D. RHI AG is gratefully acknowledged for providing materials for the study.

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Authors and Affiliations

  1. Institut P’ UPR 3346 CNRS, Université de Poitiers – ENSMA. SP2MI – Téléport 2, 11 Boulevard Marie et Pierre Curie, BP 30179, 86962, Futuroscope Chasseneuil Cedex, France

    Jean-Christophe Dupré & Pascal Doumalin

  2. Science des Procédés Céramiques et Traitements de Surface (SPCTS UMR CNRS 7315), CEC, 12 rue Atlantis, 87068, Limoges Cedex, France

    Younes Belrhiti, Imad Khlifi & Marc Huger

  3. Groupe d’Etude des Matériaux Hétérogènes (GEMH), Université de Limoges, 12 rue Atlantis, 87068, Limoges Cedex, France

    Octavian Pop

Authors
  1. Jean-Christophe Dupré
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  2. Pascal Doumalin
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  3. Younes Belrhiti
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  4. Imad Khlifi
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  5. Octavian Pop
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  6. Marc Huger
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Correspondence to Pascal Doumalin.

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Dupré, JC., Doumalin, P., Belrhiti, Y. et al. Detection of cracks in refractory materials by an enhanced digital image correlation technique. J Mater Sci 53, 977–993 (2018). https://doi.org/10.1007/s10853-017-1550-3

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  • DOI: https://doi.org/10.1007/s10853-017-1550-3

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