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Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading

Chen, Weihang and Chen, Haofeng and Li, Tianbai and Ure, James Michael (2011) Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. In: ASME Pressure Vessels & Piping Conference, PVP 2011, 2011-07-17 - 2011-07-21, Baltimore,.

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    Abstract

    In this study, the limit load, shakedown and ratchet limit of a defective pipeline subjected to constant internal pressure and a cyclic thermal gradient are analyzed. Ratchet limit and maximum plastic strain range are solved by employing the new Linear Matching Method (LMM) for the direct evaluation of the ratchet limit. Shakedown and ratchet limit interaction diagrams of the defective pipeline identifying the regions of shakedown, reverse plasticity, ratcheting and plastic collapse mechanism are presented and parametric studies involving different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack for the defective pipeline with different slot type is determined. The proposed linear matching method provides a general-purpose technique for the evaluation of these key design limits and the plastic strain range for the low cycle fatigue assessment. The results for the defective pipeline shown in the paper confirm the applicability of this procedure to complex 3-D structures.

    Item type: Conference or Workshop Item (Paper)
    ID code: 32405
    Keywords: shakedown , ratchet limit, lineasr matching method, defective pipeline, Mechanical engineering and machinery, Mechanical Engineering, Mechanics of Materials, Computational Mechanics, Metals and Alloys, Analysis
    Subjects: Technology > Mechanical engineering and machinery
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
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    Depositing user: Pure Administrator
    Date Deposited: 03 Aug 2011 16:24
    Last modified: 07 Sep 2014 18:53
    URI: http://strathprints.strath.ac.uk/id/eprint/32405

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