Thermal-Fatigue Analysis of Turbine Discs under Complex Thermo-Mechanical Loading with Account of Plasticity and Creep Effects

Abstract:

During operation of transport and maneuverable gas-turbine units, there are crack formation in turbine disc rims what exerted by thermomechanical cycling loads. For in-depth study of these problems we have to use theories of plasticity and creep which form the basis for determining the complex stress-strain state in the stress concentration zone for disc rims, and a modern failure criterion which can predict lifetime under conditions of simultaneous plastic and creep strain accumulation. There is a finite-element method (FEM) that allows us to evaluate the stress-strain state in a stress concentration zone for a non-elastic material behavior. With plasticity and creep theories, it is possible to determine local strain quiet reliable by FEM.

• Periodical: Applied Mechanics and Materials (Volumes 725-726)
• Pages: 955-960
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.725-726.955
• Online since: January 2015
• Authors: Igor Ignatovich*, Artem S. Semenov, Sergey Semenov, Leonid Getsov
• Keywords: Crack Initiation, Creep, Damage, Deformation Criterion, Elasticity, Non-Proportional Cyclic Loading, Plasticity, Thermal Fatigue, Turbine Discs

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