Plastic Pipes Conference Association # 2006 Washington DC
Hsuan, Zhang, Wong
The 100-year stress crack resistance (SCR) of corrugated HDPE pipes was evaluated using a 600 mm diameter pipe. The SCR tests were performed on the finished pipe at the liner and junction locations. The notched constant ligament stress (NCLS) test (ASTM 2163) was used for the pipe liner assessment. For the pipe junction, a new test method was developed to challenge the junction geometry between the liner and corrugation. The test media was water to simulate the field condition of the drainage pipe and different elevated temperatures were utilized to accelerate crack growth rate. Two extrapolation methods, Popelar’s Shift Method (PSM) and Rate Processing Method (RPM), were examined by comparing the predicted curve with experimental data. The results indicate that the RPM is a more reliable method, and has been adopted to perform the 100 years prediction. Utilizing the junction test data at 60, 70 and 80oC, the brittle curve at 23oC was predicted. The failure time was found well exceeded 100 years at the stress level of 3.4 MPa. Based on the results of the study, material specification for 100-year service life of corrugated HDPE pipes was established.
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