Study of ratchet limit and cyclic response of welded pipe

Puliyaneth, Manu and Barbera, Daniele and Chen, Haofeng and Xuan, Fuzhen (2018) Study of ratchet limit and cyclic response of welded pipe. International Journal of Pressure Vessels and Piping, 168. pp. 49-58. ISSN 0308-0161 (https://doi.org/10.1016/j.ijpvp.2018.09.004)

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Abstract

Ratcheting and low cycle fatigue are failure mechanisms observed in components subjected to cyclic temperature and mechanical loads. Ratcheting is a global failure mechanism which leads to an incremental plastic collapse of the component whereas low cycle fatigue is a localized mechanism which leads to crack initiation. It is exacerbated by grooves, notches and changes in the geometry of the component. To estimate the remaining life of the component and predict its failure mechanism, it is important to understand how it responds to various combinations of cyclic loads. This paper includes investigation of the ratchet limit and the plastic strain range, which is associated with the low cycle fatigue, of a circumferential butt-welded pipe by using the ratchet analysis method which includes Direct Steady Cycle Analysis (DSCA) within the Linear Matching Method Framework (LMMF). The pipe is subjected to a constant internal pressure and a cyclic thermal load. The investigation is carried out by varying 1) material properties of the weld metal (WM); 2) ratio of inner radius to wall thickness; 3) weld geometry. Within the specified ranges, yield stress and the ratio of inner radius to wall thickness affect the ratchet limit curve. The cyclic thermal load plays a crucial role compared to the internal pressure in influencing the ratchet limit curve. It is observed that the pipe experiences thermal ratcheting in the absence of pressure load at lower yield stress values of the WM. The results obtained are combined to create a limit load envelope, which can be used for the design of welded pipes within the specified ranges.

ORCID iDs

Puliyaneth, Manu, Barbera, Daniele, Chen, Haofeng ORCID logoORCID: https://orcid.org/0000-0001-6864-4927 and Xuan, Fuzhen;
  • Item type:Article
    ID code:65370
    Dates:
    Date
    Event
    1 December 2018
    Published
    5 September 2018
    Published Online
    3 September 2018
    Accepted
    3 July 2017
    Submitted
    Notes:© 2018 Elsevier Ltd. All rights reserved. Manu Puliyaneth, Daniele Barbera, Haofeng Chen, Fuzhen Xuan, Study of ratchet limit and cyclic response of welded pipe, International Journal of Pressure Vessels and Piping, Volume 168, 2018, Pages 49-58, https://doi.org/10.1016/j.ijpvp.2018.09.004
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:05 Sep 2018 12:46
    Last modified:11 Nov 2024 12:05
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65370
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