Research Papers: Pipeline Systems

Failure Envelopes for Composite Fiber Reinforced Pipe Elbows Subject to Combined Loading—A Numerical Assessment

[+] Author and Article Information
Duncan Camilleri

Department of Mechanical Engineering,
Faculty of Engineering,
University of Malta,
Msida MSD2080, Malta
e-mail: duncan.camilleri@um.edu.mt

Brian Ellul

Department of Mechanical Engineering,
Faculty of Engineering,
University of Malta,
Msida MSD2080, Malta
e-mail: brian.ellul@um.edu.mt

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 20, 2018; final manuscript received July 16, 2018; published online August 22, 2018. Editor: Young W. Kwon.

J. Pressure Vessel Technol 140(5), 051701 (Aug 22, 2018) (12 pages) Paper No: PVT-18-1083; doi: 10.1115/1.4040994 History: Received April 20, 2018; Revised July 16, 2018

Composite pipes are currently being used in a multitude of applications varying from civil to oil and gas applications. Pipes are generally connected together by means of pipe elbows that in turn are subjected to bending moment and pressure loading. This study looks into the effect of combined loading on the first ply and ultimate failure load of pipe elbows. The influence of pressure loading followed by a bending moment versus first applying bending moment followed by subsequent pressure loading, on the ultimate catastrophic failure load, is investigated through numerical models. The combined bending moment and pressure load ramping is also studied. Design by analysis finite element damage mechanics numerical methods are applied to investigate post first ply failure (FPF) and stress redistribution. The study shows that different loading combinations can give rise to different damage mechanisms and ultimately failure loads. A safe design load envelope for different fiber-reinforced pipe elbows based on FPF and ultimate catastrophic load is identified and discussed.

Copyright © 2018 by ASME
Topics: Pressure , Stress , Pipes , Failure
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Fig. 1

Progressive ply failure algorithm implemented

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Fig. 2

Schematic diagram of straight pipe and elbow together with the applied loading and boundary conditions

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Fig. 3

Typical fabrication procedure adopted to manufacture pipe elbows: (a) laying of the initial CSM layer on a half-pipe-elbow mold, (b) bonding of two halves, (c) laying of the DR layers aligned in the hoop and axial directions, (d) laying of the outer CSM layer, and (e) laying of a CSM band on the inner side of the extrados and intrados of the elbow

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Fig. 4

Finite element model of pipe elbow

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Fig. 5

Elements used for transfer of bending moment or application of fixed boundary condition

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Fig. 6

Tsai-Wu failure index at different layers for pipe elbow R3D2 subject to an internal pressure only—3.28 bar: (a) layer 1 (CSM), (b) layer 2 (DR, hoop 90 deg), (c) layer 3 (DR, axial 0 deg), and (d) layer 4 (CSM)

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Fig. 7

Axial and hoop stress developed at layer 2 (hoop 90 deg) subject to internal pressure at the FPF load of pipe elbow R3D2: (a) axial stress and (b) hoop stress

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Fig. 8

Tsai-Wu failure index at layer 3 (direct roving—axial 90deg) for pipe elbow R2D3 (displacement magnified by x5)

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Fig. 9

Tsai-Wu failure index at different layers for pipe elbow R3D2 subject to bending only (FPF at 1158 N m): (a) layer 1 (CSM), (b) layer 2 (DR, hoop 90 deg), (c) layer 3 (DR, axial 0 deg), and (d) layer 4 (CSM)

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Fig. 10

Axial and hoop stress developed at layer 2 (hoop 90 deg) of pipe elbow R3D2 subject to bending moment at FPF load: (a) axial stress and (b) hoop stress

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Fig. 11

Synchronous pressure and bending moment loading rsyn = 30, layer 2 (DR –hoop 90 deg) of pipe elbow R3D2: (a) axial stress and (b) Tsai-Wu index

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Fig. 12

Progression of failure in direct roving layers 2 (hoop 90 deg) and 3 (axial 0 deg) of pipe elbow R3D2 for synchronous loading rsyn = 30

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Fig. 13

First ply failure loads and global failure loads for pressure to bending moment ratios varying in the range 10 ≤ rsyn ≤ 2000

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Fig. 14

Final failure loads of different loading configurations and combinations for all the six specimens listed in Table 2



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