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Research Papers: Materials and Fabrication

Analyses on the Short-Term Mechanical Properties of Plastic Pipe Reinforced by Cross Helically Wound Steel Wires

[+] Author and Article Information
Jinyang Zheng1

Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, Chinajyzh@zju.edu.cn

Xiang Li, Xiufeng Lin, Yaxian Li

Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, China

Ping Xu

Department of Mechanics, Zhejiang University, Hangzhou 310027, China

1

Corresponding author.

J. Pressure Vessel Technol 131(3), 031401 (Feb 11, 2009) (10 pages) doi:10.1115/1.3066826 History: Received December 21, 2007; Revised April 01, 2008; Published February 11, 2009

Plastic pipe reinforced by cross helically wound steel wires, namely PSP, is a new plastic-matrix steel composite pipe developed in China recently. In order to understand the mechanical properties of PSP under internal pressure, a four-layer analytical model, which considers the torsion caused by the differences between the winding angles of the inner and outer steel wire layers, has been proposed using structural mechanics. The model includes an inner high density polyethylene (HDPE) layer, an inner steel wire layer, an outer steel wire layer, and an outer HDPE layer. To investigate the mechanical properties in inner and outer steel wire layers, the elastic parameters of the composite monolayer plate were deduced from the rectangle outside and circle inside model. During the elastic response of PSP subjected to internal pressure, the stresses and strains in four layers and pressures between the interfaces were obtained. Good agreement between theoretical results and experimental data was observed, which shows that the presented model can be employed to predict stresses, strains, and torsions in PSP. The failure modes and torque values between PSPs manufactured by two different methods were compared, and the influence of the change in the winding angle on the strain in the exterior surface was also discussed.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Structure of PSP. (a) Composite structure with liner pipe, steel-screen skeleton and outer cover pipe, heat melted together and (b) the HDPE liner pipe with cross winding steel wires tightly wrapped over.

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Figure 2

Cross-sectional diagrammatic sketch of PSP. (a) Physical structure of PSP and (b) structural model of PSP. 1. Outer HDPE layer, 2. outer steel wires layer, 3. inner steel wires layer, and 4. inner HDPE layer.

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Figure 3

Composite structural model of inner and outer steel wire monolayer plates

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Figure 4

Simplified structural model of the monolayer plate

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Figure 5

Representative volume unit of the composite material monolayer

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Figure 6

Tension schematic volume unit

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Figure 7

Rectangle outside and circle inside model. (a) Calculation model and (b) calulation model.

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Figure 8

Schematic of locations of the measuring points of axial and hoop strains

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Figure 9

Physical figure of the test equipment

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Figure 10

General assembly diagram of the clamp

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Figure 11

Comparison of theoretical and experimental values

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Figure 12

Failure mode of full winding

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Figure 13

Failure mode of half winding

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Figure 14

Predicted torque values in the PSP by two winding methods versus pressure

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Figure 15

The curve of strains versus angles

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