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Research Papers: Materials and Fabrication

Viscoelastic and Damage Model of Polyethylene Pipe Material for Slow Crack Growth Analysis

[+] Author and Article Information
Yue Zhang

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China
e-mail: zhangyue@zju.edu.cn

Xiangpeng Luo

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China
e-mail: xiangpengluo9@163.com

Jianfeng Shi

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Yuquan Campus,
Room 101, Teaching Building 4,
Hangzhou 310027, China
e-mail: shijianfeng@zju.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 15, 2017; final manuscript received March 9, 2018; published online April 19, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 140(3), 031406 (Apr 19, 2018) (12 pages) Paper No: PVT-17-1155; doi: 10.1115/1.4039699 History: Received August 15, 2017; Revised March 09, 2018

Polyethylene (PE) pipe is widely used for oil and gas transportation. Slow crack growth (SCG) is the main failure mechanism of PE pipes. Current SCG resistance testing methods for PE pipes have significant drawbacks, including high cost, time-consuming, and uncertain reliability. Alternative method is in need to reduce the testing time and cost. In this paper, a numerical model is proposed by taking the viscoelastic and damage effect of PE material into account. The material behavior is described on the basis of linear viscoelastic integral constitutive model, along with the damage effect in effective configuration concept. A three-dimensional (3D) incremental form of a viscoelastic and damage model is derived and implemented by abaqus UMAT. It is found that the curve of tensile displacement versus time, as well as the curve of crack opening displacement (COD) versus time from numerical results fit well with those from the standard Pennsylvania Notch Test (PENT; ASTM 1473). Based on the proposed model, SCG failure process is analyzed, and the effects of damage parameters on SCG process are furtherly studied and discussed.

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References

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Figures

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Fig. 1

Diagram of decoupling

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Fig. 2

Stress relaxation curves

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Fig. 3

Relaxation modulus curves

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Fig. 4

Master curve of relaxation modulus

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Fig. 5

Fitting results of relaxation modulus master curves

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Fig. 6

Comparisons of experimental and predicting results: (a) 14 MPa and (b) 16 MPa

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Fig. 7

PENT standard specimen dimension

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Fig. 8

Curve of tensile displacement

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Fig. 9

Curve of crack opening displacement

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Fig. 10

Morphology after fracture

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Fig. 11

Finite element model of PENT specimen

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Fig. 12

PENT specimen clamping diagram

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Fig. 13

Difference between loading schemes

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Fig. 14

Comparison of tensile response between experimental measurements and model prediction

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Fig. 15

Comparison of COD

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Fig. 16

Comparison of COD rate

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Fig. 17

Comparison of COD rate

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Fig. 18

Comparison of fracture surface: (a) experimental test and (b) numerical test

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Fig. 20

Damage value along the path

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Fig. 21

Effect of parameter Γ0φ: (a) tensile displacement-time and (b) damage value-maximum principal strain

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Fig. 22

Effect of parameter Y0: (a) tensile displacement-time and (b) damage value-maximum principal strain

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Fig. 23

Effect of parameter q: (a) tensile displacement-time and (b) damage value-maximum principal strain

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Fig. 24

Effect of parameter k: (a) tensile displacement-time and (b) damage value-maximum principal strain

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