| Titre : |
Short-term HDPE pipe degradation upon exposure to aggressive environments |
| Type de document : |
texte imprimé |
| Auteurs : |
L. Alimi, Auteur ; K. Chaoui, Auteur ; W. Ghabeche, Auteur ; W. Chaoui, Auteur |
| Année de publication : |
2014 |
| Article en page(s) : |
8 p. |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Déformations (mécanique)
Eau
Méthanol
Polyéthylène haute densité
Rupture (mécanique)
ToluèneLe toluène, également appelé méthylbenzène ou phénylméthane est un hydrocarbure aromatique sous la forme d'un liquide transparent, très répandu et utilisé comme produit de départ industriel ou comme solvant. Il dissout un grand nombre d'huiles, graisses, résines (naturelles ou de synthèse). Il a une odeur caractéristique (type dissolvant pour peinture) rappelant celle, douceâtre, du benzène apparenté.
Tuyauterie -- Détérioration
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Natural gas and drinkable water are regularly transported by underground polyethylene pipe networks in urban and rural areas. The interaction between materials such as high density polyethylene (HDPE) and contact environments is a critical factor which strongly influences pipe behaviour for short and long terms. The aim of this study is to establish separate effects of H2SO4, a mixture of toluene-methanol and distilled water on the mechanical properties of HDPE pipes. Two testing geomerties representing the pipe wall are considered : orthogonally machined filaments and ASTP standard specimens. Tensile tests are carried out on both specimen types using a computer controlled Zwick machine. It is observed that chemical environments degrade mechanical properties causing a structural weakening especially those specimens exposed to organic solvent and acid. For instance, filaments show a reduction in elastic modulus of 64% after 7 days of exposure to toluene and methanol. Compared to standard specimens, the obtained properties are much higher indicating that geometry has an effect on the measured values. Fluctuations in mechanical properties are most probably caused by cristallinity gradients all the way through the pipe wall. This type of results allowed establishing the linear relationship between the elastic modulus and the yield stress and is intended to contribute to a better understanding of properties heterogeneity effects when exposed to unfavourable environments. |
| Note de contenu : |
- EXPERIMENTAL : Sample preparation - Immersion conditions - Tensile properties - Oxidative induction time
- RESULTS AND DISCUSSION : Mechanical behaviour - Mechanical properties - Yields stress-young's modulus relationship - Antioxidant loss |
| Référence de l'article : |
701 |
| DOI : |
http://dx.doi.org/10.1051/mattech/2013083 |
| En ligne : |
http://www.mattech-journal.org/articles/mattech/pdf/2013/06/mt130043.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20704 |
in MATERIAUX & TECHNIQUES > Vol. 101, N° 7 (2013) . - 8 p.
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