Characterisation of aged HDPE pipes from drinking water distribution : investigation of crack depth by Nol ring tests under creep loading

Clémence Devilliers (1, 2, 3) , Lucien Laiarinandrasana (1) , B. Fayolle (2) , E. Gaudichet-Maurin (3)

1 MAT - Centre des Matériaux
2 LIM - Laboratoire d'Ingénierie des Matériaux
3 Centre de recherche sur l'eau

HDPE pipes are used for the transport of drinking water. However, disinfectants in waterseem to have a strong impact on their mechanical behaviour, limiting their lifetime inoperation. Indeed, oxidation occurs when they are in contact with disinfectants leading to theformation of a thin oxidised layer coupled to the cracks initiation of cracks of different lengthsfrom the inner wall surface. An original method is proposed here to characterise the ageingeffect of the pipe mechanical behaviour. Inspired from the ASTM D 2290-04 standard, NolRing tests have been performed under tensile and creep loadings on smooth rings. Aconstitutive equation has been determined from these tests using a finite element (FE)modelling. FE simulations have been performed to study the influence of the thin oxidised PElayer. Precracked specimens with different crack depth ratio have also been modelled. Thecrack depth ratio is an important parameter to quantify pipe ageing.

Mots clés: HDPE pipes; Nol Ring creep test; ageing effects; fracture mechanism; crack depth ratio; aged layer thickness; finite element modelling

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Clémence Devilliers, Lucien Laiarinandrasana, B. Fayolle, E. Gaudichet-Maurin. Characterisation of aged HDPE pipes from drinking water distribution : investigation of crack depth by Nol ring tests under creep loading. Fracture of materials and structures from micro to macro scale - ECF 18, Aug 2010, Dresden, Germany. 8 p. ⟨hal-00541101⟩