Shakedown, ratchet, and limit analyses of 90° back-to-back pipe bends under cyclic in-plane opening bending and steady internal pressure

Cho, Nak-Kyun and Chen, Haofeng (2017) Shakedown, ratchet, and limit analyses of 90° back-to-back pipe bends under cyclic in-plane opening bending and steady internal pressure. European Journal of Mechanics - A/Solids. ISSN 0997-7538 (In Press)

[thumbnail of Cho-Chen-EJM-2017-back-to-back-pipe-bends-under-cyclic-in-plane-opening-bending-and-steady-internal-pressure]
Preview
 Text. Filename: Cho_Chen_EJM_2017_back_to_back_pipe_bends_under_cyclic_in_plane_opening_bending_and_steady_internal_pressure.pdf
Accepted Author Manuscript
License: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 logo
Download (1MB)| Preview

Abstract

A 90° back-to-back pipe bend structure subjected to cyclic in-plane bending moment and steady internal pressures is analysed by means of the Linear Matching Method (LMM) in order to create the limit, shakedown, and ratchet boundaries. The analyses performed in this work demonstrate that the cyclic moment has a more significant impact upon the structural integrity of the pipe bend than the constant pressure. Full cyclic incremental analyses are used to verify the structural responses either side of each boundary and confirm correct responses. In addition, the shakedown boundary produced by the LMM is compared to another shakedown boundary of an identical pipe bend computed by the simplified technique and it is shown that the LMM calculates results more accurately. Parametric studies involving a change of geometry of the pipe bends and loading type are carried out. From the studies of the geometry, two semi-empirical equations are derived from correlations of the reverse plasticity limit and the limit pressure with the bend characteristic. Finally, the results presented in this paper provide a comprehensive understanding of post-yield behaviours of the 90° back-to-back pipe structure under the combined loading as well as offering essential points to be concerned for the life assessment of the piping system.

ORCID iDs

Cho, Nak-Kyun and Chen, Haofeng ORCID logoORCID: https://orcid.org/0000-0001-6864-4927;
  • Item type:Article
    ID code:61971
    Dates:
    Date
    Event
    7 October 2017
    Published
    7 October 2017
    Accepted
    Keywords:pipe bends, shakedown, rachetting, reverse plasticity, linear matching method (LMM), 90° back-to-back pipe bend, Mechanical engineering and machinery, Mechanical Engineering
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:09 Oct 2017 13:41
    Last modified:20 Sep 2023 00:53
    URI:https://strathprints.strath.ac.uk/id/eprint/61971
CORE (COnnecting REpositories)