Refinement of a High Cycle Fatigue Decision-Gate Assessment for Additively Repaired Blades
| Autor: | Onome Scott-Emuakpor, Brian Runyon, Daniel Gillaugh, Lucas Smith, Philip Johnson |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 144 |
| ISSN: | 1528-8919 0742-4795 |
| Popis: | A recently developed high cycle fatigue (HCF) Acceptance Criteria demonstrates effectiveness in assessing the viability of two laser directed energy deposition (DED) repair processes on Titanium 6Al-4V (Ti 6Al-4V) fan blades. The assessment of these repairs requires a keen understanding of the average HCF behavior and the associated empirical data distribution. Specifically, detailed observations of the HCF regression behavior, stress amplitude dataset distribution, porosity size and distribution, and crack nucleation and propagation life are necessary. The amalgamation of these observations leads to information that quantifiably compares predicted fatigue life and data reliability of repaired blades to baseline blades within a percentage margin of acceptability. Despite a demonstration of the effectiveness of the HCF Acceptance Criteria, additional factors need to be considered to include available material or component information and nondestructive evaluation (NDE) conditional acceptance. This study explores the rigidity of the HCF Acceptance Criteria by applying it to Laser DED repaired turbine engine fan blades. The results help define a prior rule (entrance statement) that identifies expected results based on manufacturing/microstructure information as well as a second-tier rule incorporating NDE for a more refined HCF Acceptance criteria. |
| Databáze: | OpenAIRE |
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