Investigation of Mechanical Property of Pe Pipe with Scratch Defect Under Vehicle-Road-Pipe Coupling

39 Pages Posted: 20 Mar 2024

See all articles by Zheng Su

Zheng Su

affiliation not provided to SSRN

Ying Wu

affiliation not provided to SSRN

Peng Wu

affiliation not provided to SSRN

Abstract

The installation of town gas pipelines across roads is an inevitable process. The safety of these buried pipelines is severely compromised due to the long-term impact of vehicle loading. However, current studies have overlooked the influence of road structure and the effects of time-varying vehicle loading on the mechanical properties of the pipelines. To address this gap, a dynamic response model was established to study the mechanical response of the buried pipeline under vehicle loading. This model takes into account the influence of the road material structure in the vehicle-road-pipe coupling system. The study further explores the variation in pipeline stress response under different influencing factors. The findings reveal that under vehicle load, the pipeline is most vulnerable when the scratch defect is located at 90° and 270° in the circumferential direction of the pipe, and the axial direction of the pipe is directly beneath the vehicle load; As the scratch depth, vehicle load, and internal pressure of the pipe increase, the von Mises stress of the polyethylene pipe with scratch defects also increases. The maximum von Mises stress is found deep within the scratch defect; A sensitivity analysis was conducted to determine the degree of influence of each parameter on the maximum von Mises stress of the pipe. The order of influence is as follows: internal pressure > scratch depth > scratch axial position > vehicle load > scratch circumferential position; The GWO (Grey Wolf Optimization)-GPR (Gaussian process regression) model can effectively predict peak stresses in multifactor nonlinear pipelines. This research provides a foundation for the maintenance of buried pipes and holds significant implications for the safe operation of urban gas pipelines.

Keywords: Scratch defect, Vehicle-road-pipe coupling, Time-varying vehicle load, Numerical simulation, Hybrid machine learning model.

Suggested Citation

Su, Zheng and Wu, Ying and Wu, Peng, Investigation of Mechanical Property of Pe Pipe with Scratch Defect Under Vehicle-Road-Pipe Coupling. Available at SSRN: https://ssrn.com/abstract=4765700 or http://dx.doi.org/10.2139/ssrn.4765700

Zheng Su

affiliation not provided to SSRN ( email )

No Address Available

Ying Wu (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

Peng Wu

affiliation not provided to SSRN ( email )

No Address Available

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