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- Title
Effects of frequency on fatigue crack growth at elevated temperature.
- Authors
Tong; Byrne
- Abstract
The effects of frequency on fatigue crack growth behaviour have been studied in a prealloyed powder material, Udimet 720Li, at 650 °C. Fracture mode and fatigue crack growth behaviour were studied at frequencies ranging from 0.001 to 5 Hz using a balanced triangular waveform. Tests were carried out under constant ΔK control, with load ratio and temperature being held constant. A mechanism map was constructed where predominantly time, mixed and cycle-dependent crack growth behaviour were identified. The results were verified by SEM analyses. Cycle-dependent crack growth data were obtained at room temperature, while fully time-dependent crack growth data were generated under sustained loads at 650 °C. It was found that mixed time/cycle-dependent behaviour is of most significance for this material at the temperature and frequencies studied. Data for other nickel-based superalloys from various sources in the literature were compiled and compared with those of U720Li alloy at a given stress intensity and temperature in the mixed regime. An analysis was developed to rationalize the observed effect of frequency on fatigue crack growth rate.
- Subjects
MATERIAL fatigue; TEMPERATURE; FREQUENCY response; FRACTURE mechanics
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 1999, Vol 22, Issue 3, p185
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1046/j.1460-2695.1999.00160.x