Plastic collapse of pipe bends under combined internal pressure and in-plane bending

A.C. Robertson, H. Li, D. Mackenzie

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failure
and accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.
LanguageEnglish
Pages407-416
Number of pages9
JournalInternational Journal of Pressure Vessels and Piping
Volume82
Issue number5
DOIs
Publication statusPublished - May 2005

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Pipe
Plastics
Load limits
Finite element method

Keywords

  • pipe bend
  • plastic collapse criterion
  • plastic instability
  • geometric non-linearity

Cite this

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abstract = "Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failureand accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.",
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Plastic collapse of pipe bends under combined internal pressure and in-plane bending. / Robertson, A.C.; Li, H.; Mackenzie, D.

In: International Journal of Pressure Vessels and Piping, Vol. 82, No. 5, 05.2005, p. 407-416.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Plastic collapse of pipe bends under combined internal pressure and in-plane bending

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AU - Li, H.

AU - Mackenzie, D.

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N2 - Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failureand accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.

AB - Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failureand accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.

KW - pipe bend

KW - plastic collapse criterion

KW - plastic instability

KW - geometric non-linearity

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