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Research Papers: Materials and Fabrication

Short-Term Mechanical Analysis of Polyethylene Pipe Reinforced by Winding Steel Wires Using Steel Wire Spiral Structural Model

[+] Author and Article Information
Jun Shi

Hubei Provincial Key Laboratory of
Chemical Equipment Intensification and
Intrinsic Safety,
Wuhan Institute of Technology,
School of Mechanical and Electrical Engineering,
Wuhan 430074, China

Jianfeng Shi, Yue Zhang

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China

Hanxin Chen

Wuhan Institute of Technology,
School of Mechanical &
Electrical Engineering,
Wuhan 430074, China
e-mails: 0503020117@163.com;
pg01074075@163.com

Yibin He, Qingjun Wang

Wuhan Institute of Technology,
School of Mechanical &
Electrical Engineering,
Wuhan 430074, China

Guangzhong Li

Huangsheng Pipe Group Co., Ltd,
Wenzhou 325000, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 6, 2017; final manuscript received November 8, 2017; published online April 10, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 140(3), 031404 (Apr 10, 2018) (9 pages) Paper No: PVT-17-1144; doi: 10.1115/1.4039344 History: Received August 06, 2017; Revised November 08, 2017

Polyethylene pipe reinforced by winding steel wires (PSP) is a new type of polymer–matrix composite pipe that is widely used in petroleum, chemical engineering, and water supply, etc. PSP is composed of a high-density polyethylene (HDPE) core pipe, an outer cover layer (HDPE), and a steel wire skeleton sandwiched in the middle. The steel wire skeleton is formed by crossly winding steel wires integrated with HDPE matrix by cohesive resin. In traditional models, components of PSP are considered linear elastic and the steel wire skeleton is assumed to be an orthotropic composite layer based on classical laminated plate theory. Although satisfactory results can be achieved, traditional models neglect the material nonlinearity of the steel wires and HDPE matrix, which is an important consideration to failure analysis. In this study, a new finite element model was constructed based on the actual steel wire spiral structure of PSP. The steel wires and the HDPE matrix were modeled separately and were represented by solid elements. The steel wires were not in contact with each other, and the interaction between the steel wires and the HDPE matrix was characterized by tie constraint. Experimental result of short-term burst pressure of PSP was used to validate the nonlinear model. The calculation results of the nonlinear model agreed well with the experimental result. The effects of the nonlinear material property of components on the calculation results were investigated, and the short-term mechanical responses of PSP were analyzed through the nonlinear model.

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Figures

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Fig. 4

Boundary condition of PSP model

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Fig. 3

Steel-wire spiral structural finite element model of PSP: (a) one steel wire, (b) steel-wire skeleton, (c) the interval between inner and outer steel wires, (d) HDPE spiral strap, (e) composite layers (See online version for color), (f) zoom of one steel and its corresponding HDPE strap, and (g) overall structure of PSP

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Fig. 2

Schematic diagram of the cross section of PSP: 1—inner HDPE layer, 2—inner composite layer, 3—middle adhesive layer, 4—outer composite layer, and 5—outer HDPE layer

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Fig. 1

Structure of PSP [4]: 1—inner HDPE layer, 2—inner steel wires, 3—outer steel wires, and 4—outer HDPE layer

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Fig. 5

Uniaxial tensile test of HDPE

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Fig. 6

Uniaxial tensile curves of constituents: (a) Steel wire and (b) HDPE

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Fig. 8

Variation of nodal mechanical response in nonlinear model with the increasing inner pressure: (a) von Mises stress and (b) equivalent plastic strain

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Fig. 9

Variation of the nodal von Mises stress in linear elastic model with the increasing inner pressure

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Fig. 7

PSP specimen of short-term burst test: (a) global view and (b) local view

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Fig. 10

Schematic diagram of calculation process of different models: (a) nonlinear model and (b) Linear elastic model; 1—material curve of steel wire, 2—material curve of HDPE

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Fig. 11

Stress contour of steel wires: (a) stress distribution of all steel wires and (b) variation of stress in one outer steel wire. (See online version for color).

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Fig. 12

Von Mises stress variation of steel wires with axial coordinates

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Fig. 13

Variation of the hoop strain of each HDPE layer with the increase in the inner pressure

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Fig. 14

Strain contour of hoop strain in the middle part: (a) strain contour and (b) comparison between the strain map and PSP configuration

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Fig. 15

Hoop strain of each layer along the axial direction

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Fig. 16

The relationship between the positions of inner steel wires and the valleys of strain in inner HDPE layer

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Fig. 17

The relationship between the positions of steel wires and the valleys of strain in middle layer

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Fig. 18

The relationship between the positions of outer steel wires and the valleys of strain in outer HDPE layer

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Fig. 19

The composite layer consisting of HDPE straps and steel wires: A: HDPE matrix and B: steel wire

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Fig. 20

Equivalent plastic strain in inner HDPE strap

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