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

[+] Author and Article Information
Nak-Kyun Cho

Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom
nkcho81@hotmail.com

Haofeng Chen

Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom; School of Mechanical and Power Engineering, East China University of Science and Technology, 200237, China
haofeng.chen@strath.ac.uk

Donald Mackenzie

Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom
d.mackenzie@strath.ac.uk

Dario Giugliano

Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom
dario.giugliano@strath.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4043376 History: Received January 30, 2019; Revised March 23, 2019

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 a ninety-degree 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.

Copyright (c) 2019 by ASME
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