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Plasticity Induced Residual Stress in Pipes

[+] Author Affiliations
Daowu Zhou, Ali Mirzaee-Sisan

Det Norske Veritas (DNV), London Solutions, London, United Kingdom

Paper No. OMAE2012-83530, pp. 437-443; 7 pages
doi:10.1115/OMAE2012-83530
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4490-8
  • Copyright © 2012 by ASME

abstract

An analytical model for predicting residual stress introduced in a pipe (away from girth weld) by plastic bending is examined. Stresses for a specific case where the pipe is bent, reverse bent and straightened are compared with results from a non-linear finite element analysis. The analytical model is then used to determine the through-thickness plasticity induced residual stress in the axial direction for a wide range of pipe geometries which are typically used offshore. It is found that the magnitude of extreme axial residual stress depends significantly on the ratio of pipe diameter to wall thickness. A simplified formula for estimating the extreme fibre tensile residual stress is derived and presented.

Copyright © 2012 by ASME
Topics: Plasticity , Stress , Pipes

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