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Research Papers: Design and Analysis

Long-Term Stress Analysis of Plastic Pipe Reinforced by Cross-Wound Steel Wire

[+] Author and Article Information
Xiang Li, Yongquan Qin

Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. China

Jinyang Zheng1

Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. Chinajyzh@zju.edu.cn

Ping Xu

Department of Mechanics, Zhejiang University, Hangzhou 310027, P. R. China

1

Corresponding author.

J. Pressure Vessel Technol 132(4), 041201 (Jul 20, 2010) (11 pages) doi:10.1115/1.4001424 History: Received August 18, 2008; Revised February 01, 2010; Published July 20, 2010; Online July 20, 2010

Plastic pipe reinforced by cross helically wound steel wires, namely, PSP, is a new plastic-matrix steel composite pipe developed in China recently, were theoretically and experimentally investigated herein. Although the steel wires carry most of the loading in a linear elastic way, time-dependent behavior was demonstrated in PSP, and was then the subject of further analysis and description. Based on the structural features of PSP and the viscoelastic behaviors of the matrix, a three-layer viscoelastic model was proposed to identify time-dependent elastic stresses and strains for PSP subjected to internal pressure. The experimental results showed that the hoop strain decreased slowly, while the axial strain increased by 0.16% in 14,000 min at constant internal pressure. Good agreement between theoretical results and experimental data demonstrated that the three-layer viscoelastic model was able to predict the time-dependent relationship of stress and strain. Finally, the effects of the steel-wire volume fraction and the winding angle on the creep behavior of PSPs subjected to an internal pressure were analyzed.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

PSP structure: (a) composite structure with the inner layer (1), steel-screen skeleton (3), outer layer (4), and cohesive resin (2) heat melted together. (b) HDPE wrapped over by a cross-wound steel wire.

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Figure 2

Experimentally determined hoop and axial deformations

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Figure 4

Tensile test of the HDPE specimen

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Figure 5

Strain-time curves at six difference stresses

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Figure 6

Long-term strain-time curves at 6 MPa

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Figure 7

Stress dependence behavior of the horizontal displacement factor

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Figure 8

Stress dependence behavior of the vertical displacement factor

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Figure 9

Viscoelastic model units: (a) Voigt model, (b) SLS model, and (c) multiple SLS model

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Figure 10

The nine-mode SLS fit line

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Figure 15

Predicted hoop and axial strains of the PSP with 5.03% volume fraction of steel wires

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Figure 16

Predicted time-dependent average tension stress of steel wires in 50 years

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Figure 17

Predicted time-dependent average tension stress of steel wires in 100 h

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Figure 18

Predicted hoop and axial strains of the PSP pipe with 33.3 deg winding angle of steel wires

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Figure 19

Predicted hoop and axial strains of the PSP pipe with 36.3 deg winding angle of steel wires

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Figure 20

Predicted hoop and axial strains of PSP with 1.34% volume fraction of steel wires

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Figure 21

Predicted hoop and axial strains of PSP with 2.68% volume fraction of steel wires

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Figure 14

Strain-time curve of the HDPE

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Figure 13

Comparison of theoretical and experimental values

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Figure 12

Strain test system: (a) experimental test system and (b) test pipes

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Figure 11

PSP cross-sectional diagrammatic sketch: (a) PSP four-layered model: (1) outer HDPE layer, (2) outer steel-wire layer, (3) inner steel-wire layer, and (4) inner HDPE layer. (b) PSP three-layered model: (1) outer HDPE layer, (2) composite layer, and (3) inner HDPE layer.

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