<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors operating under non-isothermal conditions. The assessment was performed by comparing strain amplitudes calculated using the Neuber and Glinka-Molski methods and those predicted by the finite element analysis (FEA) employing elastic-plastic material model. The results of investigations reveal that the Neuber method provides an upper bound limit, while the Glinka-Molski method results in a lower bound limit of strain amplitude. In the case of rotor heat grooves, both methods provide equally accurate results of notch strain amplitude and are suited to estimating lower and upper bound limits of low-cycle fatigue life under non-isothermal conditions.</p></abstract>

The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors operating under non-isothermal conditions. The assessment was performed by comparing strain amplitudes calculated using the Neuber and Glinka-Molski methods and those predicted by the finite element analysis (FEA) employing elastic-plastic material model. The results of investigations reveal that the Neuber method provides an upper bound limit, while the Glinka-Molski method results in a lower bound limit of strain amplitude. In the case of rotor heat grooves, both methods provide equally accurate results of notch strain amplitude and are suited to estimating lower and upper bound limits of low-cycle fatigue life under non-isothermal conditions.

Applicability of Notch Stress-Strain Correction Methods to Low-Cycle Fatigue Life Prediction of Turbine Rotors Subjected to Thermomechanical Loads

Energy Conversion Department, The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences

Faculty of Technical Sciences, Department of Mechanics and Machine Design

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors...

Applicability of Notch Stress-Strain Correction Methods to Low-Cycle Fatigue Life Prediction of Turbine Rotors Subjected to Thermomechanical Loads

Published Online: Oct 16, 2018

Page range: 179 - 185

Received: Apr 05, 2017

Accepted: Jul 26, 2018

DOI: https://doi.org/10.2478/ama-2018-0027

Keywords
Low-Cycle Fatigue, Turbine Rotors, Thermomechanical Load

© 2018 Bialystok University of Technology published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Applicability of Notch Stress-Strain Correction Methods to Low-Cycle Fatigue Life Prediction of Turbine Rotors Subjected to Thermomechanical Loads

Published Online: Oct 16, 2018

Page range: 179 - 185

Received: Apr 05, 2017

Accepted: Jul 26, 2018

DOI: https://doi.org/10.2478/ama-2018-0027

KeywordsLow-Cycle Fatigue, Turbine Rotors, Thermomechanical Load

© 2018 Bialystok University of Technology published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Low-Cycle Fatigue, Turbine Rotors, Thermomechanical Load