Analyse de la sécurité et de la protection anti-bélier des conduites coudées d'adduction d'eau potable en polyéthylène haute densité

Abstract : Water scarcity will be threatening more than 40% of the world population by 2050, more than 240 million people will not have a source of improved water. In fact, to ensure a sustainable management of this resource, the minimization of the leakages in drinking-water supply network is vital. Pipe rupture, a frequent phenomenon in urban zones, starts with a defect, under the effect of constraints caused by an unusual over pressure: Water Hammer. Since the 80s, polyethylene is being widely considered in manufacturing the pipelines water supply networks. Nevertheless, junctions are the most dangerous zones in the networks. As a result, it is vital to study the tear resistance of the angled conducts in PEHD. To solve this problem, a study is approached with an experimental investigation and a digital approach by fine elements in order to characterize the behavior in the fissuring of pipe bends PE100. Two methodologies are proposed to determine the tenacity of the PEHD: the method of the J-integral and the method of the sharp's movement opening of crack "CTOD ". The combination of these tools permits to choose the critical value of the integral J as a value of the tenacity of the HDPE. In addition, a simplified formula was proposed based on the calculation of the J-integral as a function of the pressure in water supply networks in the presence of a superficial defect. Finally, the water hammer phenomenon was investigated in order to determine the overpressure with a mathematical model which was developed in this thesis. The fluid-structure interaction was found to be important in defining the pressure at elbow pipe
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2017_0115_DALLALI.pdf
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01761388
Contributor : Memoires Ul <>
Submitted on : Monday, April 9, 2018 - 10:05:13 AM
Last modification on : Sunday, June 2, 2019 - 10:02:22 AM

Identifiers

  • HAL Id : tel-01761388, version 1

Citation

Manel Dallali. Analyse de la sécurité et de la protection anti-bélier des conduites coudées d'adduction d'eau potable en polyéthylène haute densité. Mécanique des matériaux [physics.class-ph]. Université de Lorraine; École nationale d'ingénieurs de Sfax (Tunisie), 2017. Français. ⟨NNT : 2017LORR0115⟩. ⟨tel-01761388⟩

Share

Metrics

Record views

26