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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Dhopade, Priyanka Andrew, J. Neely |
| Copyright Year | 2014 |
| Abstract | Gas turbine engine components are subject to both low-cycle fatigue (LCF) and high-cycle fatigue (HCF) loads. To improve engine reliability, durability and maintenance, it is necessary to understand the interaction of LCF and HCF in these components, which can adversely affect the overall life of the engine while they are occurring simultaneously during a flight cycle. A fully coupled aeromechanical fluid-structure interaction (FSI) analysis in conjunction with a fracture mechanics analysis was numerically performed to predict the effect of representative fluctuating loads on the fatigue life of blisk fan blades. This was achieved by comparing an isolated rotor to a rotor in the presence of upstream inlet guide vanes (IGVs). A fracture mechanics analysis was used to combine the HCF loading spectrum with an LCF loading spectrum from a simplified engine flight cycle in order to determine the extent of the fatigue life reduction due to the interaction of the HCF and LCF loads occurring simultaneously. The results demonstrate the reduced fatigue life of the blades predicted by a combined loading of HCF and LCF cycles from a crack growth analysis, as compared to the effect of the individual cycles. In addition, the HCF aerodynamic forcing from the IGVs excited a higher natural frequency of vibration of the rotor blade, which was shown to have a detrimental effect on the fatigue life. The findings suggest that FSI, blade-row interaction and HCF/LCF interaction are important considerations when predicting blade life at the design stage of the engine. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791845776 |
| DOI | 10.1115/GT2014-26009 |
| Volume Number | Volume 7B: Structures and Dynamics |
| Conference Proceedings | ASME Turbo Expo 2014: Turbine Technical Conference and Exposition |
| Language | English |
| Publisher Date | 2014-06-16 |
| Publisher Place | Düsseldorf, Germany |
| Access Restriction | Subscribed |
| Subject Keyword | Cycles Fatigue life Fracture mechanics Vibration Blades High cycle fatigue Rotors Flight Durability Fluid structure interaction Fracture (materials) Maintenance Modeling Low cycle fatigue Engines Stress Design Gas turbines Inlet guide vanes Reliability |
| Content Type | Text |
| Resource Type | Article |
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