NF EN ISO 18756
Fine ceramics (advanced ceramics, advanced technical ceramics) - Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure (SCF) method
ISO 18756:2003 describes a test method that covers the determination of fracture toughness of monolithic ceramic materials at room temperature by the surface crack in flexure (SCF) method. This International Standard is intended for use with monolithic ceramics and whisker- or particulate-reinforced ceramics that are regarded as macroscopically homogeneous. It does not include continuous-fiber reinforced ceramic composites. The test method is applicable to materials with either flat or rising crack growth resistance curves.
ISO 18756:2003 describes a test method that covers the determination of fracture toughness of monolithic ceramic materials at room temperature by the surface crack in flexure (SCF) method.
This International Standard is intended for use with monolithic ceramics and whisker- or particulate-reinforced ceramics that are regarded as macroscopically homogeneous. It does not include continuous-fiber reinforced ceramic composites.
The test method is applicable to materials with either flat or rising crack growth resistance curves.
- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions2
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4 Symboles3
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5 Principe4
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6 Appareillage5
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7 Éprouvettes6
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7.1 Dimensions de l'éprouvette, préparation de l'éprouvette et chanfreinage des arêtes6
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7.2 Nombre d'éprouvettes6
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8 Mode opératoire7
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8.1 Introduction de la préfissure par empreinte Knoop7
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8.2 Rupture de l'éprouvette11
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8.3 Mesurage des dimensions de la fissure12
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8.4 Effets dus au milieu ambiant13
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8.5 Option: estimation du comportement de courbe R14
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8.6 Option: matériaux de référence14
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9 Calcul14
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10 Rapport d'essai16
- Annexe A (informative) Effets dus au milieu ambiant17
- Annexe B (normative) Caractérisation de la préfissure18
- Annexe C (informative) Estimation de la courbe R par la méthode SCF25
- Annexe D (normative) Facteurs de correction du chanfrein28
- Bibliographie30
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