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Mécanisme de ruine des géotextiles non-tissés soumis à la traction
Résumé Cette étude propose une interprétation de la courbe tension-déformation obtanue sur un géotextile au moyen de l'appareil de traction sur bande large, développé à l'Université de Liège (Belgique). Elle permet de démontrer le mécanisme de ruine de ce matériau sous ce type de sollicitation.
Summary The research reported is based on a run of tensile tests on non-woven geotextiles, carried out on a tension machine for wide strips and designed at the University of Liège. The specimens have a length width ratio of1/8. The test is stopped during initial load increments and the specimen subjected to an unloading-loading cycle including zero loading. This is done for several load levels. The moduli observed during the unloading-loading cycles (residual modulus ER) are very different (higher) from those recorded along the curve of initial application of load (EN). After the unloading-loading cycle, when the stress level becomes equal to the value recorded at the stopping point before unloading, the modulus observed passes from ER to EN without transition. These findings have led to a definition of a rheological model of the material. The user will be interested to know that, after first application of load, the non-woven material will behave in compliance with the residual mode, that is to say with an elastic modulus from 2.5 to 3 times higher than the value usually assumed.
Mécanisme de ruine des géotextiles non-tissés soumis à la traction
Résumé Cette étude propose une interprétation de la courbe tension-déformation obtanue sur un géotextile au moyen de l'appareil de traction sur bande large, développé à l'Université de Liège (Belgique). Elle permet de démontrer le mécanisme de ruine de ce matériau sous ce type de sollicitation.
Summary The research reported is based on a run of tensile tests on non-woven geotextiles, carried out on a tension machine for wide strips and designed at the University of Liège. The specimens have a length width ratio of1/8. The test is stopped during initial load increments and the specimen subjected to an unloading-loading cycle including zero loading. This is done for several load levels. The moduli observed during the unloading-loading cycles (residual modulus ER) are very different (higher) from those recorded along the curve of initial application of load (EN). After the unloading-loading cycle, when the stress level becomes equal to the value recorded at the stopping point before unloading, the modulus observed passes from ER to EN without transition. These findings have led to a definition of a rheological model of the material. The user will be interested to know that, after first application of load, the non-woven material will behave in compliance with the residual mode, that is to say with an elastic modulus from 2.5 to 3 times higher than the value usually assumed.
Mécanisme de ruine des géotextiles non-tissés soumis à la traction
Rigo, J. M. (author) / Perfetti, J. (author)
Matériaux et Construction ; 14 ; 289-294
1981-07-01
6 pages
Article (Journal)
Electronic Resource
French
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