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research-article

Effects of Reeling on Pipe Structural Performance Part II: Analysis

[+] Author and Article Information
Yafei Liu

Research Center for Mechanics of Solids, Structures & Materials The University of Texas at Austin, WRW 110, Austin, TX 78712
yafei.liu@utexas.edu

Stelios Kyriakides

Research Center for Mechanics of Solids, Structures & Materials The University of Texas at Austin, WRW 110, Austin, TX 78712
skk@mail.utexas.edu

Jyan-Ywan Dyau

Research Center for Mechanics of Solids, Structures & Materials The University of Texas at Austin, WRW 110, Austin, TX 78712
omni.tech1@msa.hinet.net

1Corresponding author.

ASME doi:10.1115/1.4037064 History: Received December 19, 2016; Revised May 03, 2017

Abstract

Part II presents two modeling schemes for simulating the reeling/unreeling of a pipeline, with the aim of establishing the degrading effect of the process on the structural performance of the pipeline. A three-dimensional (3D) finite element model of the winding/unwinding of a long section of pipeline onto a rigid reel is presented first. The second model applies the curvature/tension loading history experienced at a point to a section of pipe in contact with a rigid surface of variable curvature. Both models use nonlinear kinematic hardening plasticity to model the loading/reverse loading of the material. The 3-D model first demonstrates how the interaction of the problem nonlinearities influences the evolution of deformation and load parameters during reeling/unreeling. The two models are subsequently used to simulate the three-reeling/unreeling cycle experiments under different levels of back tension in Part I. The ovality- and axial elongation-tension results are reproduced by both models with accuracy for the first cycle, adequately for the second cycle, and are overpredicted for the third cycle. The two models are also used to simulate the reeling/unreeling followed by collapse of the tubes under external pressure experiments. Both models reproduce the measured ovality- tension results and the corresponding collapse pressures accurately. Since the two-dimensional model is computationally much more efficient, it is an attractive tool for estimating the effect of reeling on collapse pressure. Questions that require exact tracking of the winding/unwinding history and the interaction of the pipe with the reel are best answered using the 3D model.

Copyright (c) 2017 by ASME
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