INVESTIGADORES
FRONTINI patricia Maria
artículos
Título:
External pressure induced buckling collapse of High Density Polyethylene (HDPE) liners: FEM modeling and predictions
Autor/es:
FEDERICO RUEDA; JUAN P TORRES; MARTÍN MACHADO; JOSÉ L OTEGUI; P. M. FRONTINI,
Revista:
THIN-WALLED STRUCTURES
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2015
ISSN:
0263-8231
Resumen:
Thermoplastic polymers such as HDPE are nowadays widely used as lining materials for oiland gas pipelines. However, during maintenance or unexpected service stoppages, these liners canundergo external pressure induced bucking collapse. The objective of this work is to assess themechanical response of HDPE liners undergoing buckling collapse by means of Finite ElementModeling (FEM) simulations. To accomplish this, an advanced constitutive model, namely the ThreeNetwork Model (TNM) was employed. In order to determine the input parameters for the model, aseries of tensile and compressive uniaxial tests were conducted. Simulations were performed usingFinite element modeling (FEM) analysis on ABAQUS 6.10. The suitability of the model for thisparticular application was assessed by contrasting the simulation and the experimental results of adiametral compression test. The complex strain rate and pressure dependent mechanical response ofHDPE liners was analyzed by modeling the buckling collapse dynamic event as an increasing volume offluid entering the gap cavity between liner and host pipe. The model predictions allowed establishing amathematical relationship between the depressurization velocity of the tubes and the resultingcollapse pressure. These relations can be used to improve the current design guidelines for plasticliner