NDLI: The Stress Analysis and Residual Stress Evaluation of Pressure Armour Layers in Flexible Pipes Using 3D Finite Element Models

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Upul, S. Fernando Tan, Zhimin Sheldrake, Terry Clements, Richard
Copyright Year	2004
Abstract	A pressure armour layer is an essential feature of un-bonded flexible pipes. The layer is made of an inter-locked helically wound metal wire of profiled section, whose primary use is to provide the circumferential strength of the pipe to resist internal pressure. The general design philosophy of the layer is defined in API 17J in terms of the stress “utilisation” factor that specifies the maximum allowable average hoop stress in the layer, which is conventionally produced by the elastic stress analysis. During pressure armour layer manufacturing (a cold forming process), the armour wire is however subjected to a sequence of cyclic bending and twisting deformations which take it beyond its material elastic limit. This paper presents FE structure models for investigating the detailed local and residual stress variation during the forming process, and the subsequent stress relaxation as a result of the factory acceptance test (FAT). A study case is presented for illustrating the typical stress and strain behaviour after FAT pressurization. The paper also introduces X-ray diffraction technology as a method for residual stress measurement on full scale samples.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	57
Ending Page	65
Page Count	9
File Format	PDF
ISBN	0791837459
DOI	10.1115/OMAE2004-51200
e-ISBN	0791837386
Volume Number	23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 3
Conference Proceedings	ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2004-06-20
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	American petroleum institute Relaxation (physics) Deformation Work hardening Metals Stress analysis (engineering) X-ray diffraction Wire Pressure Stress Design Finite element model Armor Hoop stress Manufacturing Pipes
Content Type	Text
Resource Type	Article

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