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Creep Life Assessment of an Uncooled Turbine Blade Using Probabilistic Design

[+] Author Affiliations
Bjorn Sjodin

Siemens Industrial Turbomachinery AB, Finspang, Sweden

Paper No. GT2016-56660, pp. V07BT29A002; 6 pages
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4984-2
  • Copyright © 2016 by Siemens Energy, Inc.


The probabilistic method described in this paper is a general method that can be applied to a variety of problems. In this particular paper it is applied to a creep problem where the time to creep crack initiation in a turbine blade is studied for the case of 6 random input variables. A response surface is created with a few Finite Element calculations and distributions are chosen for the random variables. The failure event is defined and the life time distribution is solved for and at the end compared to operational experience with the blade. The blade is made of the material IN792 and the load case represents the gas turbine is running on full load and ISO inlet temperature conditions. A statistical tool has been used to compare the calculated lifetimes with field experience of the same. The match between our calculated expected lifetimes and the real observed lifetimes are very good.

Copyright © 2016 by Siemens Energy, Inc.



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