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Research Papers: Materials Technology

Collapse and Buckling Behaviors of Reinforced Thermoplastic Pipe Under External Pressure

[+] Author and Article Information
Yong Bai

Institute of Structural Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: baiyong@zju.edu.cn

Nuosi Wang

Institute of Structural Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: wangnuosi@gmail.com

Peng Cheng

Institute of Structural Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: chengpeng@zju.edu.cn

Hongdong Qiao

Institute of Structural Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: qiao150001@zju.edu.cn

Binbin Yu

Institute of Structural Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: yubinbinqq@yeah.net

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 7, 2013; final manuscript received March 31, 2015; published online June 15, 2015. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 137(4), 041401 (Aug 01, 2015) (9 pages) Paper No: OMAE-13-1045; doi: 10.1115/1.4030645 History: Received May 07, 2013; Revised March 31, 2015; Online June 15, 2015

The collapse and buckling behaviors of reinforced thermoplastic pipe (RTP) under external pressure are studied in this paper. A theoretical model which includes axial and shear deformation is applied based on the model initially proposed by Kyriakides and his coworkers. Simulation of the reinforced layers of RTP is simplified using equivalent stiffness method. The load–displacement relation of RTP under external pressure is obtained based on the theoretical model. A three-dimensional (3D) finite element model (FEM) is also built to simulate the response of RTP using the software abaqus. Numerical simulation results from abaqus are similar to those from theoretical model. Besides, external pressure tests for RTP are carried out and the test results are compared with the analyzed results. Finally, factors that influence the external pressure capacity are also studied.

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References

Dalmolen, L. G. P., Kruyer, Ir. M., and Cloos, P. J., 2009, “Offshore Applications of “Reinforced Thermoplastic Pipe” (RTP),” Business Unit Soluforce, Pipelife Nederland B. V. MERL Conference, pp. 14–18.
Gellin, S., 1980, “The Plastic Buckling of Long Cylindrical Shells Under Pure Bending,” Int. J. Solid Struct., 16(5), pp. 397–407. [CrossRef]
Yeh, M. K., and Kyriakides, S., 1986, “On the Collapse of Inelastic Thick-Walled Tubes Under External Pressure,” ASME J. Energy Resour. Technol., 108(1), pp. 35–47. [CrossRef]
Gong, S. F., Ni, X. Y., Bao, S., and Bai, Y., 2012, “Asymmetric Collapse of Offshore Pipelines Under External Pressure,” Ships Offshore Struct., 8(2), pp. 176–188. [CrossRef]
Yang, C., Pang, S. S., and Zhao, Y., 1997, “Buckling Analysis of Thick-Walled Composite Pipe Under External Pressure,” J. Compos. Mater., 31(4), pp. 409–426. [CrossRef]
Sato, M., and Patel, M. H., 2007, “Exact and Simplified Estimations for Elastic Buckling Pressures of Structural Pipe-In-Pipe Cross Sections Under External Hydrostatic Pressure,” J. Mar. Sci. Technol., 12(4), pp. 251–262. [CrossRef]
Arjomandi, K., and Taheri, F., 2011, “A New Look at the External Pressure Capacity of Sandwich Pipes,” Mar. Struct., 24(1), pp. 23–42. [CrossRef]
Zhu, Y. C., 2007, “Buckling Analysis of Plastic Pipe Reinforced by Winding Steel Wires under External Pressure,” M.S. thesis, Zhejiang University, Hang Zhou, China.
Bai, Y., Wang, N., Cheng, P., Yu, B., Badaruddin, M. F., and Ashri, M., 2011, “Collapse of Reinforced Thermoplastic Pipe (RTP) Under External Pressure,” ASME Paper No. OMAE2011-49324, pp. 275–280 [CrossRef].
Bai, Y., Wang, N., and Cheng, P., 2012, “Collapse of RTP (Reinforced Thermoplastic Pipe) Subjected to External Pressure,” Proceedings of the International Conference on Pipelines and Trenchless Technology, Section: Pipeline Design—Transmission, Distribution, and In-Plant, pp. 725–743.
Plastic Pipe Institute, 2008, Handbook of Polyethylene Pipe, 2nd ed., Plastic Pipe Institute, Irving, TX, Chap. III.
Zhang, C., and Moore, I. D., 1997, “Nonlinear Mechanical Response of High Density Polyethylene, Part I: Experimental Investigation and Model Evaluation,” Polym. Eng. Sci., 37(2), pp. 404–413. [CrossRef]
Zhang, C., and Moore, I. D., 1997, “Nonlinear Mechanical Response of High Density Polyethylene, Part II: Uniaxial Constitutive Modeling,” Polym. Eng. Sci., 37(2), pp. 414–420. [CrossRef]
Zheng, J. Y., Li, X., Xu, P., and Lin, X. F., 2009, “Analyses on the Short-Term Mechanical Properties of Plastic Pipe Reinforced by Cross Helically Wound Steel Wires,” ASME J. Pressure Vessel Technol., 131(3), p. 031401. [CrossRef]
ASTM D 2924, 2006, Standard for External Pressure Resistance of Fiberglass Pipe, American Society for Testing and Materials, West Conshohocken, PA.
API RP 17B, 2008, Recommended Practice for Flexible Pipe, American Petroleum Institute, Washington, DC.

Figures

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Fig. 2

Simplified theoretical model for cross section of RTP

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Fig. 3

Details of tensile test for PE100

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Fig. 4

Result of tensile test for PE100

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Fig. 5

Transformation of reinforced layer

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Fig. 6

Fits for the curve of HDPE tensile test

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Fig. 7

Determination of plastic buckling pressure

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Fig. 8

The FEM for RTP: (a) layers in the cross section, (b) fibers, (c) fibers embedded, (d) coupling of end surface, (e) boundary conditions, and (f) mesh of cross section

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Fig. 9

The pressure chamber and the specimens before test

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Fig. 10

Specimens after test

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Fig. 11

Time–pressure curve of external pressure test

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Fig. 12

Ovalization–pressure curve for S2

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Fig. 13

Ovalization–pressure curve for S4

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Fig. 14

The effect of elastic modulus on the load–displacement relation of RTPs

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Fig. 15

The effect of yield stress on the load–displacement relation of RTPs

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Fig. 16

The relation between D0/t ratio, initial imperfection, and failure pressure

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