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Load Control–Strain Control Isochronous Stress–Strain Curves for High Temperature Nonlinear Analysis PUBLIC ACCESS

[+] Author Affiliations
Gregory S. Bechtel, Thomas S. Cook

GE Aircraft Engines, Cincinnati, OH

Paper No. 93-GT-411, pp. V03CT17A072; 9 pages
doi:10.1115/93-GT-411
From:
  • ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3C: General
  • Cincinnati, Ohio, USA, May 24–27, 1993
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7892-7
  • Copyright © 1993 by ASME

abstract

Aircraft gas turbine components are subjected to severe operating conditions. High temperatures, large thermal strains, and mechanical loads combine to cause the material to undergo significant nonlinear behavior. In order to assure safe, durable components, it is necessary that analysis methods be available to predict the nonlinear deformation. General purpose finite element codes are available to perform elastic and viscoplastic analyses, but the analyses are expensive. Both large plastic and creep strain analyses can require significant computer resources, but typically a plastic solution is more economical to run than a time stepping creep or viscoplastic model solution. For those applications where the deformation is principally time dependent, it is advantageous to include time dependent creep effects in a “constant time” or “isochronous” analysis. Although this approach has been used in the past to estimate rupture life, this paper will present several significant new techniques for doing an isochronous analysis to analyze time dependent deformation.

Copyright © 1993 by ASME
This article is only available in the PDF format.

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