Ratchet limits for a crack in a welded pipe subjected to a cyclic temperature load an a constant mechanical load

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

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This paper presents the ratchet limit analysis of a pipe with a symmetric crack in a mismatched weld by using the extended Linear Matching Method (LMM). Two loading conditions are considered: i) a cyclic temperature load and a constant internal pressure; and ii) a cyclic temperature load and a constant axial tension. Individual effects of i) the geometry of the Weld Metal (WM), ii) the size of the crack, iii) the location of the crack and iv) the yield stress of WM on the ratchet limits, maximum temperature ranges to avoid ratchetting and limit loads are investigated. Influence functions of the yield stress of WM on the maximum temperature ranges and limit loads are generated. The results confirm the applicability of the extended LMM to the cracked welded pipe.
Original languageEnglish
Publication statusPublished - 17 Jul 2011
EventASME Pressure Vessels and Piping Conference - Baltimore, Maryland, United States
Duration: 17 Jul 201121 Jul 2011


ConferenceASME Pressure Vessels and Piping Conference
Country/TerritoryUnited States
CityBaltimore, Maryland,


  • crack
  • ratchet limit
  • limit load
  • welded pipe
  • maximum temperature range

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