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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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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