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NF EN ISO 14125

Fibre-reinforced plastic composites. Determination of flexural properties.

Edition date: 1998-06-01
In Force
Available languages: English, French
Summary: 1.1 La présente Norme internationale prescrit une méthode pour la détermination des propriétés en flexion des composites plastiques renforcés de fibres par la méthode de chargement en trois points (méthode A) ou en quatre points (méthode B). Des éprouvettes normalisées sont définies mais des paramètres sont inclus pour d'autre dimensions d'éprouvettes, le cas échéant. Une gamme de vitesses d'essai est incluse. 1.2 La méthode ne convient pas pour la détermination des paramètres de conception, mais peut être utilisée pour sélectionner des matériaux, ou comme essai de contrôle qualité. NOTE - Par exemple, le module de flexion est seulement une valeur approchée du module d'élasticité de traction parce que l'essai ne prend pas en compte la flexion additionnelle due aux contraintes de cisaillement qui conduisent à une valeur inférieure du module de flexion, mais introduit des rapports portée/épaisseur de l'éprouvette qui minimisent cet effet. Des différences entre les propriétés de traction et de flexion sont aussi causées par la structure du matériau/empilement. 1.3 La méthode est applicable aux matériaux composites renforcés de fibres à matrices thermoplastiques et thermodurcissables. Les matériaux non renforcés, les matériaux chargés de particules et les matériaux composites renforcés de fibres courtes (c'est-à-dire dont la longueur est inférieure à 1 mm) sont traités dans l'ISO 178. 1.4 La méthode est adaptée à l'utilisation d'éprouvettes qui sont, soit moulées aux dimensions choisies, soit usinées à partir de la partie centrale de l'éprouvette à usages multiples (voir ISO 3167) soit usinées à partir de produits finis et semi-finis, tels que pièces moulées, stratifiés et plaques extrudées ou coulées. 1.5 La méthode recommande certaines dimensions pour les éprouvettes. Des essais réalisés avec des éprouvettes de dimensions différentes ou avec des éprouvettes préparées dans des conditions différentes peuvent donner des résultats qui ne sont pas comparables. D'autres facteurs, tels que la vitesse d'essai et le conditionnement des éprouvettes, peuvent également avoir une répercussion sur les résultats. Pour les matériaux qui ne sont pas homogènes dans leur section, ou au-dessus de leur domaine linéaire élastique, le résultat s'applique uniquement à l'épaisseur et la structure soumises à l'essai. En conséquence, lorsque des résultats comparatifs sont nécessaires, ces facteurs doivent être soigneusement contrôlés et enregistrés.
Keywords: PLASTICS|REINFORCED PLASTICS|MECHANICAL TESTS|BEND TESTS|DETERMINATION|MECHANICAL PROPERTIES|FLEXURAL STRENGTH
ICS: 83.120-Reinforced plastics
CTN:

International Equivalence

Identic EN ISO 14125:1998

Identic ISO 14125:1998

Modificaciones Normas

Es modificada por NF EN ISO 14125/A1:201105 (T57-105/A1)

Reemplazo Normas

Reemplaza a NF T57-105:197706 (T57-105)

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