The influence of long-range residual stress on plastic collapse ofpressurised pipes with and without flaws

Gui Yi Wu*, David J. Smith, Martyn J. Pavier

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

Structural integrity assessments of pressurised pipes include plastic collapse as a potential failure mode. This paper uses analytical and numerical models to explore the effect of the end conditions of the pipe on the collapse pressure. The pipe is open-ended and two bounding conditions are addressed: one where axial loading is applied to the ends of the pipe and the other where a fixed axial displacement is applied. The fixed axial displacement condition represents long-range or fit-up residual stress. It is common practice to treat long-range residual stress in the same way as axial loading, leading to the conclusion that such long-range residual stress reduces the collapse pressure. Pipes in a number of states are considered: pipes with no flaws, pipes with fully circumferential flaws and pipes with part circumferential flaws. The flaws consist of either a crack or a slot on the external surface of the pipe. For the axial load condition, the collapse pressure for a flawed pipe is reduced when higher magnitudes of tensile or compressive axial loads are applied. For the fixed displacement condition however, the magnitude of the displacement may have little or no effect on the collapse pressure. The results of the work indicate that substantially conservative assessments may be made of the collapse pressures of pipes containing flaws, when long-range residual stress is taken to be a form of axial loading.

Original languageEnglish
Pages (from-to)54-62
Number of pages9
JournalInternational Journal of Pressure Vessels and Piping
Volume111-112
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Limit analysis
  • Long-range residual stress
  • Plastic collapse

Fingerprint Dive into the research topics of 'The influence of long-range residual stress on plastic collapse ofpressurised pipes with and without flaws'. Together they form a unique fingerprint.

  • Cite this