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.
|Number of pages||8|
|Journal||American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP|
|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