Investigating the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of a ninety-degree back-to-back pipe bend system

Research output: Contribution to journalArticle

Abstract

Pipe bends are generally employed for routing piping systems by connecting to straight pipes but back-to-back pipe bends are often necessary for confined space applications. In order to achieve safe operation under complex loading, it requires a thorough pipeline integrity assessment to be commenced. This paper investigates the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of 90° back-to-back pipe bend system, including temperature-dependent yield stress effects. Structural response interaction boundaries are determined for various different combinations of cyclic and steady loading. Constructed structural responses are verified by full cyclic incremental, step-by-step, Finite Element Analysis. The numerical studies provide a comprehensive description of the cyclic plastic behaviour of the pipe bends, and semi-empirical equations for predicting the elastic shakedown limit boundary are developed to aid pipeline designers in the effective assessment of the integrity of the pipe bends without a requirement for complex Finite Element Analysis.
LanguageEnglish
Number of pages25
Journal Journal of Pressure Vessel Technology
Early online date4 Apr 2019
DOIs
Publication statusE-pub ahead of print - 4 Apr 2019

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Pipe
Plastics
Pipelines
Finite element method
Piping systems
Space applications
Yield stress
Temperature

Keywords

  • pipe bends
  • shakedown
  • ratcheting
  • cyclic thermo-mechanical load

Cite this

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title = "Investigating the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of a ninety-degree back-to-back pipe bend system",
abstract = "Pipe bends are generally employed for routing piping systems by connecting to straight pipes but back-to-back pipe bends are often necessary for confined space applications. In order to achieve safe operation under complex loading, it requires a thorough pipeline integrity assessment to be commenced. This paper investigates the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of 90° back-to-back pipe bend system, including temperature-dependent yield stress effects. Structural response interaction boundaries are determined for various different combinations of cyclic and steady loading. Constructed structural responses are verified by full cyclic incremental, step-by-step, Finite Element Analysis. The numerical studies provide a comprehensive description of the cyclic plastic behaviour of the pipe bends, and semi-empirical equations for predicting the elastic shakedown limit boundary are developed to aid pipeline designers in the effective assessment of the integrity of the pipe bends without a requirement for complex Finite Element Analysis.",
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author = "Nak-Kyun CHO and Haofeng Chen and Donald MacKenzie and Dario Giugliano",
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AU - Chen, Haofeng

AU - MacKenzie, Donald

AU - Giugliano, Dario

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N2 - Pipe bends are generally employed for routing piping systems by connecting to straight pipes but back-to-back pipe bends are often necessary for confined space applications. In order to achieve safe operation under complex loading, it requires a thorough pipeline integrity assessment to be commenced. This paper investigates the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of 90° back-to-back pipe bend system, including temperature-dependent yield stress effects. Structural response interaction boundaries are determined for various different combinations of cyclic and steady loading. Constructed structural responses are verified by full cyclic incremental, step-by-step, Finite Element Analysis. The numerical studies provide a comprehensive description of the cyclic plastic behaviour of the pipe bends, and semi-empirical equations for predicting the elastic shakedown limit boundary are developed to aid pipeline designers in the effective assessment of the integrity of the pipe bends without a requirement for complex Finite Element Analysis.

AB - Pipe bends are generally employed for routing piping systems by connecting to straight pipes but back-to-back pipe bends are often necessary for confined space applications. In order to achieve safe operation under complex loading, it requires a thorough pipeline integrity assessment to be commenced. This paper investigates the effects of cyclic thermo-mechanical loading on cyclic plastic behaviour of 90° back-to-back pipe bend system, including temperature-dependent yield stress effects. Structural response interaction boundaries are determined for various different combinations of cyclic and steady loading. Constructed structural responses are verified by full cyclic incremental, step-by-step, Finite Element Analysis. The numerical studies provide a comprehensive description of the cyclic plastic behaviour of the pipe bends, and semi-empirical equations for predicting the elastic shakedown limit boundary are developed to aid pipeline designers in the effective assessment of the integrity of the pipe bends without a requirement for complex Finite Element Analysis.

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KW - cyclic thermo-mechanical load

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