Abstract
An experimental scheme of studying the fatigue life of the turbine casing slot was presented. With the scheme, the stress field of the critical section was obtained by numerical analysis, and mechanical loading was applied to simulate the total stress field of the critical section at room temperature. Under the load, the fatigue life of the turbine casing slot can be obtained. Using the proposed scheme, structural improvement measure of new turbine casing, modification measure of old turbine casing and the effect of corrosion were evaluated experimently. The results show that: (1) rounding the new turbine casing slot corner with a 0.8 mm-radius can increase the safe life by 69% and 198% with confidence of 50% and 95%, respectively; (2) a fatigue life similar to the new turbine casing slot can be obtained through cutting a 1.5 mm-radius corner on the old turbine casing slot; (3) corrosion can affect the fatigue life of the turbine casing slot significantly.
| Original language | English |
|---|---|
| Pages (from-to) | 2735-2742 |
| Number of pages | 8 |
| Journal | Hangkong Dongli Xuebao/Journal of Aerospace Power |
| Volume | 29 |
| Issue number | 11 |
| DOIs | |
| State | Published - 1 Nov 2014 |
Keywords
- Casing slot
- Fatigue crack
- Fatigue experiment
- Probability-stress-cycle number (P-S-N) curve
- Turbine casing
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