6 Mechanical Characterization and Numerical Modeling of High Density Polyethylene Pipes 63 Fig. 6.5 The deformation of the pipe during the internal pressurization (burst) test, top is from the FE simulation, bottom is from the experiments Fig. 6.6 Model prediction of the pipe burst tests at 292 and 296 K and the experimental data Fig. 6.7 The variable temperature and the corresponding deformation of the pipe under a constant internal pressure To study the effect of variation in the working temperature on long-term performance of the pipe, a burst test was simulated in which the daily variation of the temperature was included. Figure 6.7 shows the variation of the temperature as the red dashed curve. An internal constant pressure of 2.275 MPa (330 Psi) was applied until the pipe failed due to excessive plastic
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