Fatigue crack propagation in turbine disks of EI698 superalloy
In-service fatigue cracking of turbine disks of EI698 superalloy is discussed based on crack growth analyses. In the bolt joint for disks to shaft connecting there is high level of stress-state, which directed to earlier in-disks fatigue crack origination in low-cycle-fatigue regime. Fracture surfac...
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| Language: | English |
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Gruppo Italiano Frattura
2013-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero24/numero_24_art_3.pdf |
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| author | A.A. Shanyavskiy |
| author_facet | A.A. Shanyavskiy |
| author_sort | A.A. Shanyavskiy |
| collection | DOAJ |
| description | In-service fatigue cracking of turbine disks of EI698 superalloy is discussed based on crack growth analyses. In the bolt joint for disks to shaft connecting there is high level of stress-state, which directed to earlier in-disks fatigue crack origination in low-cycle-fatigue regime. Fracture surface pattern such as fatigue striations were used for their spacing measurement and crack growth duration estimating. Developed disk tests on a special bench by the equivalent program to in-service cyclic loads have allowed discovering one-to-one correlation between fatigue striation spacing and crack increment in one flight. Number of fatigue striations and beach-marks calculations permitted to estimate crack growth period for the different stages of in-service disks cracking. Equivalent stress level for in-service cracked disks was calculated and compared with stress-level in-tested disks under stress equivalent program to in-service operated cyclic loads. Based on this result non-destructive inspection intervals were discussed and recommended for in-service disks in dependence on number of their flights at the moment of developed inspection to exclude in-flight disks fast fracture. |
| format | Article |
| id | doaj-art-fad676a60af9460491d70f14df902bba |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2013-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-fad676a60af9460491d70f14df902bba2025-01-02T23:02:17ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932013-04-017241325Fatigue crack propagation in turbine disks of EI698 superalloyA.A. ShanyavskiyIn-service fatigue cracking of turbine disks of EI698 superalloy is discussed based on crack growth analyses. In the bolt joint for disks to shaft connecting there is high level of stress-state, which directed to earlier in-disks fatigue crack origination in low-cycle-fatigue regime. Fracture surface pattern such as fatigue striations were used for their spacing measurement and crack growth duration estimating. Developed disk tests on a special bench by the equivalent program to in-service cyclic loads have allowed discovering one-to-one correlation between fatigue striation spacing and crack increment in one flight. Number of fatigue striations and beach-marks calculations permitted to estimate crack growth period for the different stages of in-service disks cracking. Equivalent stress level for in-service cracked disks was calculated and compared with stress-level in-tested disks under stress equivalent program to in-service operated cyclic loads. Based on this result non-destructive inspection intervals were discussed and recommended for in-service disks in dependence on number of their flights at the moment of developed inspection to exclude in-flight disks fast fracture.http://www.gruppofrattura.it/pdf/rivista/numero24/numero_24_art_3.pdfNickel-based superalloyCrack initiationCrystallographic facetFatigue striationsCrack growth periodStress equivalentNon-destructive inspection |
| spellingShingle | A.A. Shanyavskiy Fatigue crack propagation in turbine disks of EI698 superalloy Fracture and Structural Integrity Nickel-based superalloy Crack initiation Crystallographic facet Fatigue striations Crack growth period Stress equivalent Non-destructive inspection |
| title | Fatigue crack propagation in turbine disks of EI698 superalloy |
| title_full | Fatigue crack propagation in turbine disks of EI698 superalloy |
| title_fullStr | Fatigue crack propagation in turbine disks of EI698 superalloy |
| title_full_unstemmed | Fatigue crack propagation in turbine disks of EI698 superalloy |
| title_short | Fatigue crack propagation in turbine disks of EI698 superalloy |
| title_sort | fatigue crack propagation in turbine disks of ei698 superalloy |
| topic | Nickel-based superalloy Crack initiation Crystallographic facet Fatigue striations Crack growth period Stress equivalent Non-destructive inspection |
| url | http://www.gruppofrattura.it/pdf/rivista/numero24/numero_24_art_3.pdf |
| work_keys_str_mv | AT aashanyavskiy fatiguecrackpropagationinturbinedisksofei698superalloy |