Finite Element Analysis of Polyethylene Pipe Butt Fusion Joints with Circumferential Surface Cracks

Abstract:

Based on the viscoelastic material property of polyethylene pipe, software ANSYS was used to simulate and analyze the mechanical property of polyethylene pipe butt fusion joints with circumferential surface crack defects. The viscoelastic material creep parameters were characterized as Prony series and 1/4 node singular element was selected for meshing along the boundaries of the crack, then the stress intensity factor of polyethylene pipe butt fusion joints with circumferential surface crack was calculated under the uniform internal pressure. Through the finite element simulation, the result showed that polyethylene pipe were most likely to fracture failure when crack initiated. Thus the viscoelasticity of materials can be ignored when analyzing the stress intensity factor of circumferential surface cracks of polyethylene pipe. the main influencing factor of the circumferential crack defects was the ratio of the crack depth to the thickness of polyethylene pipe.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 1151-1158
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.1151
• Online since: September 2013
• Authors: Zhi Bin Zhu*, Xiao Xiang Yang, Li Jing Chen, Nai Chang Lin, Zhi Tuo Wang, Zhe Fang Wang
• Keywords: 1/4 Node Singular Element, Polyethylene Pipe, Prony Series, Stress Intensity Factor (SIF), Viscoelastic

References

[1] Yongquan Qing. Experimental Investigation on Mechanical Properties of Polyethylene Pipes' Butt Fusion Joints with Process Defects. 2010(In Chinese).

[2] Chinese Standard. CJJ63-2008. Technical specification for Polyethylene(PE) Fuel Gas Pipeline Engineering. 2008(In Chinese).

[3] Mingyang Li. Mechanics Study on the Failure Mechanism of the Buried Polyethylene Gas Pipelines. 2010(In Chinese).

[4] Jiasheng He, Wei wei, Shurong Li. Analysis for Stress Intensity Factor of Elliptical Surface Crack in U-tube with the Method of Sub-modeling. Equipment Manufacturing Technology 2008(In Chinese).

[5] MingYang Li, Guohua Chen. Calculation and Analysis of the Critical Buckling Pressure of PE Pipes with Surface Crack. China Plastics Industry, 2009; 37(5): 40(In Chinese).