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TECHNICAL PAPERS

Transient Stress Analysis and Fatigue Life Estimation of Turbine Blades

[+] Author and Article Information
Deepak Dhar, A. M. Sharan

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada

J. S. Rao

Dept. of Mechanical Engineering, I.I.T. Delhi, Hauz Khas, New Delhi, India

J. Vib. Acoust 126(4), 485-495 (Dec 21, 2004) (11 pages) doi:10.1115/1.1804996 History: Received May 01, 2001; Revised January 01, 2004; Online December 21, 2004
Copyright © 2004 by ASME
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References

Rao, J. S., 1991, Turbomachine Blade Vibration, John Wiley and Sons, Inc., New York.
Heywood, R. B., 1962, Designing Against Fatigue, Chapman and Hall.
Collins, J. A., 1981, Failure of Materials in Mechanical Design, John Wiley and Sons Inc., New York.
Osgood, Carl C., 1982, Fatigue Design, Pergamon Press.
Rust, T., and Swaminathan, V. P., 1982. “Corrosion Fatigue Testing of Steam Turbine Blading Alloys,” Proc. EPRI Workshop on Steam Turbine Reliability, Boston, MA.
Bahree,  R., Sharan,  A. M., and Rao,  J. S., 1989, “The Design of Rotor Blades Due to Combined Effects of Dynamic and Thermal Loads,” ASME J. Eng. Gas Turbines Power, 3, pp. 618–626.
Rao, J. S., 1994, Turbomachine Unsteady Aerodynamics, New Age International, London.
Irrtier, H., 1986, “Transient Vibrations of Turbine Blades Due to Passage Through Partial Admission and Nozzle Excitation Resonance,” Proc. IFToMM Intl. Conf. Rotor Dynamics, Tokyo, p. 301.
Rao, J. S., Vyas, N. S., and Gupta, K., 1987, “Transient Response of Turbine Blade,” Proc. 7th World Cong. IFToMM, Sevilla, p. 697.
Vyas, N. S., 1986, “Vibratory Stress Analysis and Fatigue Life Estimation of Turbine,” Ph.D. Thesis, IIT Delhi, 116 , pp. 718–726.
Vyas,  N. S., and Rao,  J. S., 1994, “Fatigue Life Estimation Procedure for A Turbine Blade Under Transient Loads,” ASME J. Eng. Gas Turbines Power, 116, January, p. 198.
Bahree, R., 1987, “Analysis and Design of Rotor Blades Due to the Transient Thermal and Vibratory Loads,” M. Eng Thesis, Memorial University of Newfoundland, Canada.
Rao, J. S., 1991, Turbomachine Blade Vibration, John Wiley and Sons, Inc., New York.
Turpin,  A., and Sharan,  A. M., 1994, “Balancing of Rotors Supported on Bearings Having Nonlinear Stiffness Characteristics,” ASME J. Eng. Gas Turbines Power, 116, pp. 718–726.
Cook, R. D., 1981, Concepts and Applications of Finite Element Analysis, John Wiley and Sons Inc., New York, pp. 13–121.
Warikoo,  R., and Haddara,  M. R., 1992, “Analysis of Propeller Shaft Transverse Vibrations,” Marine Structures,5, pp. 255–279.
Meirovitch, L., 1975, Elements of Vibration Analysis, McGraw-Hill, Inc., New York, p. 143.
Dhar, D., 1994, “Fatigue Life Estimation of Turbine Blades Due to Transient Thermal, Vibratory and Centrifugal Stresses,” M. Eng. Thesis, Memorial University of Newfoundland, Canada.
Gupta, K., 1979, “Vibration of Rotating Blades With Small Aspect Ratio,” Ph.D. Thesis, I.I.T. Delhi, Delhi, India, Ch. 6.
Weast, R. C., 1975, Handbook of Chemistry and Physics, CRC Press, Inc.
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Rao, J. S., 2000, Turbine Blade Life Estimation, Narosa Publishing House, New Delhi, London.
Bagci,  C., 1981, “Fatigue Design of Machine Elements Using Bagci Line Defining the Fatigue Surface Line (Mean Stress Diagram),” Mech. Mach. Theory, 16(4), p. 339.
Rao, J. S., Pathak, A., and Chawla, A., 1999, “Blade Life—A Comparison by Cumulative Damage Theories,” ASME 99-GT-287.
Marco,  S. M., and Starkey,  W. L., 1954, “A Concept of Fatigue Damage,” ASME J. Appl. Mech., 76, p. 627.
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Littler, D. J., 1969, “Thermal Stresses and Thermal Fatigue,” Proceedings of the Int. Conference Held at Berkeley Castle, Gloucestershire, England, pp. 374–386.

Figures

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Three dimensional finite element model of the blade
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(a) Representation of the nozzle excitation forces as sinusoidal pulse; (b) Vorticity strength around an airfoil
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Variation of critical speeds with time
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Vibratory stresses at various rotor speeds
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Centrifugal stresses at various rotor speeds
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Transient thermal stress (σzz) distribution in the blade for the feasible heating rate of 24°C/sec at different instants of time
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Nodal temperature variation along the z-axis at leading edge
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Fatigue failure surface defined by Bagci line

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