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

Weihang Chen, Haofeng Chen, Tianbai Li, James Michael Ure

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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.
Original languageEnglish
Publication statusPublished - 17 Jul 2011
EventASME Pressure Vessels & Piping Conference, PVP 2011 - Baltimore, , United States
Duration: 17 Jul 201121 Jul 2011

Conference

ConferenceASME Pressure Vessels & Piping Conference, PVP 2011
CountryUnited States
CityBaltimore,
Period17/07/1121/07/11

Keywords

  • shakedown
  • ratchet limit
  • lineasr matching method
  • defective pipeline

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    Chen, W., Chen, H., Li, T., & Ure, J. M. (2011). Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States.