Constitutive modeling and Computational Simulations of the external pressure induced buckling collapse of High Density Polyethylene (HDPE) liners

摘要

The objective of this work is to evaluate the capability of an advanced constitutive model, namely the Three Network Model (TNM) of simulating the mechanical response of HDPE liners undergoing buckling collapse. In order to determine the input parameters for the model, a series of tensile and compressive uniaxial tests were conducted. Simulations were performed using Finite element modeling (FEM) analysis with the ABAQUS 6.10 package. The complex strain rate, temperature and pressure dependent mechanical response of HDPE was analyzed by modeling the dynamic event as an increasing volume of fluid entering the gap cavity between liner and host pipe, and a mathematical relationship between fluid flow rate and collapse pressure was proposed.