Stress Relaxation Characteristics of the HDPE Pipe-Soil Systemby Larry J. Petroff, Spirolite Corp, United States,
Abstract: All piping materials and soils are subject to viscoelastic behavior such as stress relaxation and creep. The combination of soil and pipe viscoelastic properties determine the time-dependent behavior of a pipe-soil system. Generally, the more conforming the pipe is to the soil's response, the more favorable the system's response. For instance, buried, high-density polyethylene (HDPE) pipe may undergo a relief in load with time due to creep deflection. The largest portion of creep deflection for HDPE pipe occurs within 30 days after installation.
Subject Headings: Soil properties | Pipelines | Polyethylene | Relaxation (mechanics) | Soil-pipe interaction | Viscoelasticity | Creep
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