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

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

doi:10.1115/PVP2002-1193

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

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

Engineering

Research output: Contribution to journal › Conference article › peer-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 language	English
Pages (from-to)	33-40
Number of pages	8
Journal	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	438
DOIs	https://doi.org/10.1115/PVP2002-1193
Publication status	Published - 2002 Oct 12
Event	New and Emerging Computational Methods: Applications to Fracture, Damage and Reliability (2002 ASME Prssure Vessels and Piping Conference) - Vancouver, BC, Canada Duration: 2002 Aug 5 → 2002 Aug 9

ASJC Scopus subject areas

Mechanical Engineering

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title = "Creep-fatigue damage and life evaluation for boiler header stub weldment",

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.",

author = "Takuya Ito and Isamu Nonaka and Hideo Umaki and Hidetaka Nishida and Shizuma Shintani",

year = "2002",

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journal = "American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP",

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publisher = "American Society of Mechanical Engineers(ASME)",

note = "New and Emerging Computational Methods: Applications to Fracture, Damage and Reliability (2002 ASME Prssure Vessels and Piping Conference) ; Conference date: 05-08-2002 Through 09-08-2002",

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AU - Ito, Takuya

AU - Nonaka, Isamu

AU - Umaki, Hideo

AU - Nishida, Hidetaka

AU - Shintani, Shizuma

PY - 2002/10/12

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N2 - 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.

AB - 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.

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