Fatigue crack growth behavior of a nickel-based superalloy under turbine standard spectrum loads

In this investigation, the growth behavior of a crack in a nickel-based superalloy under a turbine standard load sequence was determined by experimental, analytical, and computational methods. In the first experimental approach, ASTM standard compact tension (CT) test specimens were fabricated and f...

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Bibliographic Details
Published inInternational journal of fracture Vol. 247; no. 2; pp. 253 - 264
Main Authors Malipatil, Sharanagouda G., Nagarajappa, N., Bojja, Ramesh, Jagannathan, N., Majila, Anuradha N., Fernando, D. Chandru, Manjuprasad, M., Manjunatha, C. M.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.08.2024
Springer Nature B.V
Subjects
Automotive Engineering
Behavior
Characterization and Evaluation of Materials
Civil Engineering
Classical Mechanics
Cold
Cold flow
Compact tension
Counting
Crack propagation
Engineering
Fatigue cracks
Fatigue failure
Fatigue tests
Fracture mechanics
Gas turbine engines
Growth models
Laboratories
Load
Mechanical Engineering
Mechanical properties
Metal fatigue
Nickel base alloys
Stress concentration
Superalloys
Titanium alloys
Turbines
Fatigue crack growth
FRANC3D
Cold-TURBISTAN
GTM720
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Summary:In this investigation, the growth behavior of a crack in a nickel-based superalloy under a turbine standard load sequence was determined by experimental, analytical, and computational methods. In the first experimental approach, ASTM standard compact tension (CT) test specimens were fabricated and fatigue crack growth (FCG) tests were conducted in a universal test machine under cold-TURBISTAN, a turbine standard spectrum load sequence. In the second analytical method, after rain-flow cycle counting of the cold-TURBISTAN sequence, the crack growth was estimated for each counted cycle from the crack growth law. The accumulated crack extension for each block of loading was thus estimated to determine the FCG behavior. In the third computational approach, a CT specimen containing an initial crack was modeled and the FCG behavior was predicted under cold-TURBISTAN spectrum load sequence using FRANC3D. The FCG trend predicted by analytical and computational methods was almost similar to the observed experimental behavior. The predicted FCG life was conservative with a life ratio ranging from 0.9 to 0.95.
ISSN:0376-9429
1573-2673
DOI:10.1007/s10704-024-00794-3