Field Performance of Corrugated Pipe Manufactured with Recycled Polyethylene Content (2018) / Chapter Skim
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41.1 Overview of Recycled Materials for Corrugated HDPE Pipes Corrugated high-density polyethylene (HDPE) pipe was first manufactured in the early 1970s for agricultural drainage applications.
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5 1.2 Failure Modes for Corrugated HDPE Pipes Manufactured with PCR Materials The global failure modes for HDPE have been well documented [e.g., in Janson (9)
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6effects of contaminants on crack initiation are expected to play a larger role, similar to creep testing (3)
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7 stress exceeds the yield strength of the material. SCG failures resulting from a constant applied stress condition are referred to as creep crack growth failures in this document, while SCG failures resulting from continued application of small cyclical loads are referred to as fatigue crack growth failures.
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8= + (1.2) t t tSCG CI CP where tSCG = Total time to failure via the slow crack growth mechanism tCI = Portion of SCG time related to crack initiation tCP = Portion of SCG time related to crack propagation To accurately assess the overall SCG performance of corrugated HDPE pipes manufactured with PCR materials, including the effects of contaminants with regard to both crack initiation and propagation, an unnotched tensile test on coupons of materials taken directly from the pipe wall was developed.
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