Creep-fatigue damage and life evaluation for boiler header stub weldment

Takuya Ito, Isamu Nonaka, Hideo Umaki, Hidetaka Nishida, Shizuma Shintani

Research output: Contribution to journalConference articlepeer-review

Abstract

In order to clarify the creep-fatigue damage process and to evaluate the creep-fatigue life for boiler 2.25 Cr-1 Mo header stub welds, a series of creep-fatigue tests were performed on partial mock-up specimens of actual plant under simulated plant loading conditions. Creep voids and micro-cracks occurred along the weld toes at an early stage of life and grew to form many short cracks. These short cracks grew both on the surface and through the wall of the stub tube and later coalesced to form one crack. It was proved that there was a correlation between the maximum crack depth and life ratio and also that there was a correlation between the maximum crack depth and the maximum crack length on the surface. A life prediction method was proposed based on these two correlations.

Original languageEnglish
Pages (from-to)33-40
Number of pages8
JournalAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume438
DOIs
Publication statusPublished - 2002 Oct 12
EventNew and Emerging Computational Methods: Applications to Fracture, Damage and Reliability (2002 ASME Prssure Vessels and Piping Conference) - Vancouver, BC, Canada
Duration: 2002 Aug 52002 Aug 9

ASJC Scopus subject areas

  • Mechanical Engineering

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