Finite element stress analysis of squeeze-off of polyethylene pressure pipes

Abstract

In this study, the stress analysis of PE 100 grade high-density polyethylene pressure pipe squeeze-off is carried out using ABAQUS, a general-purpose finite element code.  The squeeze-off phenomenon is investigated for the single and double squeeze-off pipes. In the finite element analysis, the true stress-strain curve of the material is adopted.  The stress distributions in the squeezed pipe are obtained.  Special attention is paid to the axial and von Mises stress distributions along the pipe axis and around the squeeze-off ear.  Finally, the practical implications of the axial stress and von Misses stress distributions resulting from the squeeze-off phenomenon are discussed and correlated with the minimum distance away from the pipe welds, mechanical connections, local saddle joints, or nearest squeeze-off locations imposed by related standards.