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Small Fatigue Crack Growth Mechanisms under Thermo-Mechanical Fatigue in a Polycrystalline Superalloy: Role of Crack Closure

Recently, the high-efficiency gas turbine combined cycle (GTCC) power generation has become essential in operation as a backup power supply of renewable energy sources in Japan. In turbine blades and vanes of the gas turbines operated as a backup power supply GTCC, there is growing concern about the damage due to thermo-mechanical fatigue (TMF) loading because of the expected increased starting/stopping cycle and frequent load fluctuation. This study investigated the small crack propagation behavior of naturally initiated cracks in polycrystalline Ni-based superalloy under in-phase and out-of-phase TMF loading cycles. The effect of the crack closure on small crack propagation behavior was discussed based on the results of the finite element analysis.

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Recently, the high-efficiency gas turbine combined cycle (GTCC) power generation has become essential in operation as a backup power supply of renewable energy sources in Japan. In turbine blades and vanes of the gas turbines operated as a backup power supply GTCC, there is growing concern about the damage due to thermo-mechanical fatigue (TMF) loading because of the expected increased starting/stopping cycle and frequent load fluctuation. This study investigated the small crack propagation behavior of naturally initiated cracks in polycrystalline Ni-based superalloy under in-phase and out-of-phase TMF loading cycles. The effect of the crack closure on small crack propagation behavior was discussed based on the results of the finite element analysis.

Reference
LCF10-2026-003

Title
Small Fatigue Crack Growth Mechanisms under Thermo-Mechanical Fatigue in a Polycrystalline Superalloy: Role of Crack Closure
Author(s)
Y. Yamazaki, M. Arai
DOI
10.48447/LCF10-2026-03
Event
Tenth International Conference on Low Cycle Fatigue (LCF-10)
Year of publication
2026
Publication type
conference paper (PDF)
Language
English
Keywords
Naturally initiated small fatigue crack,Thermo-mechanical fatigue (TMF),Crack growth mechanism,Crack closure behavior,Finite element analysis