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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Application of Advanced Probabilistic Fracture Mechanics to Life Evaluation of Turbine Rotor Blade Attachments

[+] Author and Article Information
H. R. Millwater, Y.-T. Wu, J. W. Cardinal, G. G. Chell

Materials and Structures Division, Southwest Research Institute, San Antonio, TX 78222

J. Eng. Gas Turbines Power 118(2), 394-398 (Apr 01, 1996) (5 pages) doi:10.1115/1.2816602 History: Received February 27, 1995; Online November 19, 2007

Abstract

This paper describes the application of an advanced probabilistic fracture mechanics computational algorithm with inspection simulation to the probabilistic life assessment of a turbine blade attachment, sometimes referred to as a steeple or fir tree. The life of the steeple is limited by high cycle fatigue. The methodology utilized combines structural finite element analysis, stochastic fatigue crack growth, and crack inspection and repair. The resulting information provides the engineer with an assessment of the probability of failure of the structure as a function of operating time and the effect of the inspection procedure. This information can form the basis of inspection planning and retirement-for-cause decisions.

Copyright © 1996 by The American Society of Mechanical Engineers
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