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New developments for fracture toughness determination by Vickers indentation

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2004
auteur(s) Chicot Didier; Pertuz Alberto; Roudet Francine; Staia M.H.; Lesage Jacky
journal (abréviation) Materials Science and Technology (MST)
volume (numéro) 20 (7)
pages 877 – 884
résumé Indentation is a traditional method used to determine the toughness of brittle materials. Different models are used for the calculation depending on the shape of the cracks that are initiated and developed as a result of the indentation. Recently it was observed that a transition between Palmqvist and median cracks is possible when increasing the indentation load. In the present study it is shown that this transition is not as sharp as is generally supposed, but is rather smooth. In these conditions standard calculation procedures cannot be applied. A new methodology is proposed here, which allows the calculation of a unique toughness value on the basis of the determination of the limits of the material cracking tendency.
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