Fatigue Life Estimation Procedure for a Turbine Blade Under Transient Loads

[+] Author and Article Information
N. S. Vyas

Department of Mechanical Engineering, Indian Institute of Technology, Kanpur 208 016 India

J. S. Rao

Department of Mechanical Engineering, Indian Institute of Technology, New Delhi 110 016 India

J. Eng. Gas Turbines Power 116(1), 198-206 (Jan 01, 1994) (9 pages) doi:10.1115/1.2906792 History: Received February 04, 1992; Online April 24, 2008


Fatigue analysis and consequent life prediction of turbomachine blading requires the stress load history of the blade. A blade designed for safe operation at particular constant rotor speeds may, however, incur damaging stresses during start-up and shut-down operations. During such operations the blade experiences momentary resonant stresses while passing through the criticals, which may lie in the speed range through which the rotor is accelerated. Fatigue due to these transient influences may accumulate to lead to failure. In this paper a technique for fatigue damage assessment during variable-speed operations is presented. Transient resonant stresses for a blade with nonlinear damping have been determined using a numerical procedure. A fatigue damage assessment procedure is described. The fatigue failure surface is generated on the S-N-mean stress axes and Miner’s Rule is employed to estimate the accumulation of fatigue.

Copyright © 1994 by The American Society of Mechanical Engineers
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