<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal conditions are presented. First, experimental tests are performed to recognise different aspects of material behaviour. Then, an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. The model describes two phases of cyclic softening, related to plastic mechanisms. An important goal of the presented research is to include thermomechanical coupling in the constitutive modelling. Next, the model parameters are identified based on the available experimental data. Some parametric studies are presented. Finally, numerical simulations are performed, which indicate the significant influence of thermomechanical coupling on the response of the constitutive model in thermomechanical fatigue conditions.</p></abstract>

In this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal conditions are presented. First, experimental tests are performed to recognise different aspects of material behaviour. Then, an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. The model describes two phases of cyclic softening, related to plastic mechanisms. An important goal of the presented research is to include thermomechanical coupling in the constitutive modelling. Next, the model parameters are identified based on the available experimental data. Some parametric studies are presented. Finally, numerical simulations are performed, which indicate the significant influence of thermomechanical coupling on the response of the constitutive model in thermomechanical fatigue conditions.

Temperature-Dependent Fatigue Characteristics of P91 Steel

Acta Mechanica et Automatica

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

{"article-title":"Temperature-Dependent Fatigue Characteristics of P91 Steel"}

In this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal...

Temperature-Dependent Fatigue Characteristics of P91 Steel

Publié en ligne: 24 juil. 2020

Pages: 69 - 78

Reçu: 17 juin 2019

Accepté: 15 mai 2020

DOI: https://doi.org/10.2478/ama-2020-0010

Mots clés
low-cycle fatigue, thermomechanical coupling, constitutive modelling

© 2020 Władysław Egner et al., published by Sciendo

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

Temperature-Dependent Fatigue Characteristics of P91 Steel

Publié en ligne: 24 juil. 2020

Pages: 69 - 78

Reçu: 17 juin 2019

Accepté: 15 mai 2020

DOI: https://doi.org/10.2478/ama-2020-0010

Mots cléslow-cycle fatigue, thermomechanical coupling, constitutive modelling

© 2020 Władysław Egner et al., published by Sciendo

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

Mots clés
low-cycle fatigue, thermomechanical coupling, constitutive modelling