Buckling collapse of HDPE liners: experimental set-up and FEM simulations

ANIBAL MARQUEZ; FEDERICO RUEDA; JOSE LUIS OTEGUI; P.M. FRONTINI

THIN-WALLED STRUCTURES

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2016 vol. 109 p. 103 - 112

0263-8231

The purpose of thiswork is to provide a more complete framework for the development of short-term thermoplasticmodels to improve the design of liners subjected to external pressure.  A device to performshort-term physical collapse buckling tests on HDPE liners to emulate in-servicebehavior under controlled conditions was designed andconstructed.Tests were performed to explore the effect of temperature(in the range of0 to 60 ºC) on the buckling parameters of a HDPE pipe confined in a steel hostpipe. The constitutive model for this material was calibrated from compressionand tensile tests, performed at various strain rates and temperatures. The Three Network viscoplasticmaterial constitutive model was adopted to reproduce material behavior. Full 3D FEM simulations of collapse buckling tests were conducted and validatedagainst experimental data. Once the 3D full FE model was verified a simplified2 D model was generated to perform an intensive parametric study consideringmany temperatures and pipe aspect ratios. With data arising from the parametricstudy a predictive  Glock´s type functionwas derived, which takes into account the effect of temperature and theviscoplastic constitutive behavior of HDPE.