Vickers Indentation Fracture (VIF) modeling to analyze multi-cracking toughness of titania, alumina and zirconia plasma sprayed coatings |
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Authors: | D Chicot G Duarte A Tricoteaux B Jorgowski A Leriche J Lesage |
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Affiliation: | aLaboratoire de Mécanique de Lille, LML UMR 8107, Université des Sciences et Technologies de Lille (USTL), IUT A GMP, BP179, 59653 Villeneuve d’Ascq, France;bLaboratoire des Matériaux et Procédés, LMP UPRES EA 2443, Université de Valenciennes et du Hainaut-Cambrésis (UVHC), Z.I. du Champ de l’Abbesse, 59600 Maubeuge, France |
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Abstract: | For massive brittle materials, the fracture toughness in mode I, KIC, can be determined using various reliable techniques. Besides, Vickers Indentation Fracture (VIF) technique has been developed to locally determine fracture toughness. However, since the indentation test generates a complex three-dimensional crack system around the indent, fracture toughness, KC, is calculated instead of KIC. Consequently some authors rightly reject the VIF technique to determine standard fracture toughness by arguing that the literature counts numerous VIF crack equations thus revealing discrepancies of this technique. Nevertheless in some cases (e.g. brittle ceramic coatings) inclusive material techniques are not applicable since presence of the substrate and/or multi-crack network can modify the crack propagation into the coating.In this work, we employed VIF technique to study multi-cracking behavior of titania, alumina and zirconia ceramic oxide coatings obtained by plasma spraying. To calculate VIF toughness, we propose (i) to select two crack equations for radial-median and Palmqvist cracking modes respectively, (ii) to adjust the crack equation of Miranzo and Moya for intermediate cracking mode, (iii) to develop a mathematical approach to determine the cracking mode, (iv) to take into account the multi-crack network by defining an equivalent four-crack system and (v) to propose a universal crack equation applicable independently of the cracking mode. |
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Keywords: | Al2O3 TiO2 ZrO2 Hardness Toughness and toughening Surfaces |
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