Estimation of Burst Pressure of PVC Pipe Using Average Shear Stress Yield Criterion: Experimental and Numerical Studies

Jinhui Yang,Shaowei Hu

doi:10.3390/app112110477

Abstract

Polyvinyl chloride (PVC) pipes have been extensively applied in water supply network fields. Understanding the mechanical properties and burst pressure of PVC pipes is necessary because a large number of pipes rupture due to excessive internal water pressure. In this paper, a practical approach based on the average shear stress yield (ASSY) criterion was proposed to assess the PVC pipe burst pressure. In addition, the PVC uniaxial tensile tests and the pipe burst tests were carried out to determine the material characteristic parameters and burst pressure of the PVC pipe. Furthermore, a finite element analysis (FEA) of PVC burst pressure was also performed based on the tangent intersection (TI) method to validate the proposed method and experimental results. Moreover, the impact of material parameters and pipe size, such as the strain hardening exponent and standard dimension ratio (SDR) on bursting pressure, were investigated. The comparison with the proposed theoretical model and the experimental and FEA results shows that the burst pressure derived from ASSY was consistent with the experimental data, with a relative error ranging from −2.76% to 2.65%, which is more accurate compared to other yield criteria. The burst pressure obtained by the ASSY approach declined with the increase of the hardening exponent n and increased with the increase of SDR. Therefore, the burst pressure solution-based ASSY proposed in this paper is an adequately suitable and precise predictive tool for assessing the failure pressure of PVC pipes.

Highlights

Water pipelines are critical infrastructures and pipe burst accidents have caused huge economic and social losses [1]
The theoretical limit water pressure loads of the pipe are derived based on plasticity The theoretical limit water pressure loads of the pipe are derived based on plasticity and small deformation assumptions, while the actual burst pressure of the pipe is obtained and small deformation assumptions, while the actual burst pressure of the pipe is obby ductile failure in pipe safety accidents
The theoretical limit water pressure loads of the pipe are derived based on plasti and small deformation assumptions, while the actual burst pressure of the pipe is tained by ductile failure in pipe safety accidents

Summary

Introduction

Water pipelines are critical infrastructures and pipe burst accidents have caused huge economic and social losses [1]. 170,569 miles of pipelines, which accounted for 12.9% of the total water pipe length in the United States and Canada [2,3]. For every 100 miles of pipeline, there are 14 ruptures per year When it comes to polyvinyl chloride (PVC) pipes, this statistical data reaches. The water cut and drop of water pressure caused by pipe burst events seriously affects the urban water supply for residents. How to avoid and hinder broken pipe accidents due to excessive water pressure has become an important research field [5,6,7,8]

Objectives

Results

Discussion

Conclusion