Low cycle fatigue life consumption analysis was carried out in this work. Fatigue cycles accumulation method suitable even if engine is not often shut down was applied together with the modified universal sloped method for estimating fatigue cycles to failure. Damage summation rule was applied to estimate the fatigue damage accumulated over a given period of engine operation. The concept of fatigue factor which indicates how well engine is operated was introduced to make engine life tracking feasible. The developed fatigue life tracking method was incorporated in PYTHIA, Cranfield University in-house software and applied to 8 months of engine operation. The results obtained are similar to those of real engine operation. At a set power level, fatigue life decreases with increase in ambient temperature with the magnitude of decrease greater at higher power levels. The fatigue life tracking methodology developed could serve as a useful tool to engine operators.
References
[1]
Cerri, G., Gazzino, M., Botta, F. and Salvini, C. (2008) Production Planning with Hot Section Life Prediction for Optimum Gas Turbine Management. International Journal of Gas Turbine, Propulsion and Power Systems, 2, 9-16.
[2]
Nabarro, F.R.N. and de Villiers, F. (1995) The Physics of Creep and Creep-Resistant Alloys. CRC Press, Taylor & Francis Group, UK.
[3]
Harmon, D., Mcclure, M., Grelotti, R. and Hartford, E. (2010) Unified Low Cycle Fatigue for Gas Turbine Engine Rotor Alloys. Proceedings of 51st AIAA/ASME/ ASCE/AHS/ASC Structures, Structural Dynamics, and Materilas Conference, Orlando, 12-15 April, 1-10.
[4]
Nicholas, T. (1999) Material Allowances for High Cycle Fatigue in Gas Turbine Engines. RTO AVT Specialists Meeting on Application of Damage Tolerance Principles for Improved Airworthiness of Rotorcraft, 1-9.
[5]
Mao, H. and Mahadevan, S. (2000) Creep Fatigue Reliability of High Temperature Materials. 8th ASCE Specialty Conference on Probabilistic Mechanics and Structural Reliability, University of Notre Dame, 4-26 July, 1-6.
[6]
Villasante, M. (2011) Predictive Methods for Combined Cycle Fatigue in Gas Turbine Blades. Aerodays, Madrid, 30 March-1 April 2011, 1-8.
[7]
Downing, S. and Socie, D. (1982) Simple Rainflow Counting Algorithms. International Journal of Fatigue, 31-40. https://doi.org/10.1016/0142-1123(82)90018-4
[8]
Glinka, G. and Kam, J. (1987) Rainflow Counting Algorithm for Very Long Stress Histories. International Journal of Fatigue, 9, 223-228. https://doi.org/10.1016/0142-1123(87)90025-9
[9]
Hong, N. (1991) A Modified Rainflow Counting Method. International Journal of Fatigue, 13, 465-469. https://doi.org/10.1016/0142-1123(91)90481-D
[10]
Baek, S.H., Cho, S.S. and Joo, W.S. (2008) Fatigue Life Prediction Based on the Rainflow Cycle Counting Method for the End Beam of a Freight Car Bogie. International Journal of Automotive Technology, 9, 95-101. https://doi.org/10.1007/s12239-008-0012-y
[11]
Saturday E.G. ,et al. (2017)Development and Application of Fatigue Cycles Accumulation Model for Industrial Gas Turbines Operation Journal of Emerging Trends in Engineering and Applied Sciences 8, 30-36.
[12]
Kim, K.S., Chen, X., Han, C. and Lee, H.W. (2002) Estimation Methods for Fatigue Properties of Steels under Axial and Torsional Loading. International Journal of Fatigue, 24, 783-793. https://doi.org/10.1016/S0142-1123(01)00190-6
[13]
Ince, A. and Glinka, G. (2011) A Modification of Morrow and Smith-Watson- Topper Mean Stress Correction Models. Fatigue & Fracture of Engineering Materials & Structures, 34, 854-867. https://doi.org/10.1111/j.1460-2695.2011.01577.x
[14]
Dowling, N.E. (2004) Mean Stress Effects in Stress-Life and Strain-Life Fatigue. Soc. Automot. Eng. Inc.
[15]
Park, J. and Song, J. (1995) Detailed Evaluation of Methods for Estimation of Fatigue Properties. International Journal of Fatigue, 17, 365-373. https://doi.org/10.1016/0142-1123(95)99737-U
[16]
Suresh, S. (2004) Fatigue of Materials. 2nd Edition, Cambridge University Press, New York.
[17]
Hashin, Z. (1979) A Reinterpretation of Palmgren-Miner Rule for Fatigue Life Prediction. Office of Naval Research, Arlington.
[18]
Sapsard, M. (2000) Recommended Practices for Monitoring Gas Turbine Engine Life Consumption. RTO/NATO-NASA, Canada Communication Group Inc.
[19]
Abdul Ghafir, M.F., Li, Y.G., Singh, R., Huang, K. and Feng, X. (2010) Impact of Operating and Health Conditions on Aero Gas Turbine Hot Section Creep Life using a Creep Factor Approach. Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air, 14-16 June 2010, 1-13.
[20]
Li, Y.G. and Singh, R. (2005) An Advanced Gas Turbine Gas Path Diagnostic System-PYTHIA. The XVII International Symposium on Air Breathing Engines, Munich, 1-12.
[21]
Saturday, E.G., Li, Y.G., Ogiriki, E.A. and Newby, M.A. (2017) Creep-Life Usage Analysis and Tracking for Industrial Gas Turbines. Journal of Propulsion and Power, 33, 1305-1314. https://doi.org/10.2514/1.B35912
