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Fatigue analysis of metallic-plastic-valve pipeline systems: a numerical case study
journal contributionposted on 2023-09-26, 01:36 authored by Ji-Sung Lee, James GongJames Gong, Wei Zeng, Martin Lambert
Metallic and plastic pipe sections are often mixed in use in water distribution systems. The interface between metallic and plastic pipe sections is typically associated with a significant change in hydraulic impedance. Multiple impedance changes in a pipeline system may induce repeated pressure reflections during hydraulic transient events, which may accelerate the fatigue process. This research simulates the hydraulic transient pressure response of a metallic-plastic series pipeline system using the method of characteristics. The impact on the fatigue lifetime of the plastic section is then investigated by adopting a fatigue analysis model based on the stress-life method. The results show that the plastic section in a metallic-plastic-valve pipeline configuration can have a significantly reduced fatigue lifetime relative to the corresponding plastic-valve configuration (a plastic pipe with a valve at one end).