Method for predetermining the fatigue life of polymer...

G - Physics – 01 – N

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G01N 3/32 (2006.01)

Patent

CA 2735847

The invention relates to a method for evaluating the fatigue life of a polymer composition, including the following steps: i) providing a polymer composition; ii) manufacturing a plurality of axisymmetric test tubes cut from said composition; iii) subjecting said test tubes to a uniaxial traction fatigue test including a plurality of loading and unloading cycles for the test tube, the geometry of the test tube making it possible to subject the material to triaxial stresses, in the area of the test tube cut, simulating the stress conditions for the pressure sheath of a flexible pipe, particularly for off-shore use; and iv) predetermining the number of cycles until the rupture of said polymer composition. The invention is related to the use of said polymer composition selected through the predetermining method for manufacturing pipes or conduits to convey a pressurized and/or corrosive fluid.

L'invention est relative à un procédé pour évaluer la tenue à la fatigue d'une composition polymérique comprenant les étapes suivantes : i) fournir une composition polymérique; ii) fabriquer plusieurs éprouvettes axisymétriques entaillées à partir de ladite composition; iii) soumettre lesdites éprouvettes à un test de fatigue en traction uniaxiale comprenant plusieurs cycles de chargement et déchargement de l'éprouvette. La géométrie de l'éprouvette permet d'imposer au matériau des contraintes tri-axiales, dans la zone de l'entaille de l'éprouvette, simulant les conditions de sollicitation de la gaine de pression d'un tuyau flexible, notamment dans une application off-shore, et iv) déterminer le nombre de cycles à rupture pour ladite composition polymérique. L'invention est relative à l'utilisation de cette composition polymérique sélectionnée au moyen du procédé de détermination pour la fabrication de tuyaux ou conduits destinés à véhiculer un fluide sous pression et/ou corrosif.

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