Advanced high-density polyethylene used in pipelines networks

This paper presents the most important results obtained during tensile tests carried out on high-density polyethylene (HDPE) for pipelines used for water supply networks. Various specimens have been cut from HDPE 20 x 2 mm, 63 x 4 mm and 90 x 6 mm pipelines and subjected to tensile and four-point bending loads to determine their mechanical properties including stiffness and Young's modulus. Load-extension distributions have also been determined. Two special cases of composite pipelines have been taken into consideration in theoretical approach: the cross-ply composite pipeline and the balanced angle-ply composite one, both subjected to internal pressure. In tensile tests, the stiffness evaluation of high-density polyethylene pipelines used for water supply networks put into evidence that the Young's modulus and stiffness increase with the increase of pipelines' diameter. (C) 2018 The Authors. Published by Elsevier B.V.