Journal of Applied and Computational Mechanics

Numerical Analysis of Resource Characteristics of Structural Elements under Thermocycling Loading

Articles in Press

Document Type : Research Paper

Authors

1 National Research Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Avenue, building 6, Nizhny Novgorod 603950, Russian Federation

2 Department of Mechanics of Materials and Structures, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 11/12 Gabriela Narutowicza Street, Gdansk, 80-233, Poland

3 Department of Civil and Environmental Engineering and Architecture (DICAAR), University of Cagliari, Via Marengo, 2, 09123 Cagliari, Italy

Abstract

We discuss methodological aspects of assessment of the service life of structures and devices used in new technologies, paying a particular attention to non-stationary thermomechanical loading of “dangerous” zones of the systems under investigation. As result, using the approach of modern mechanics of the degradable continuum, we develop a model describing the associated processes of viscoplastic deformation and damage accumulation and adapted it to description of thermal fatigue. The presented model describes the main effects of inelastic deformation and damage accumulation processes in polycrystalline structural alloys for arbitrary complex deformation trajectories. A combined form of the kinetic equations for damage accumulation in the areas of interaction between low-cycle fatigue and long-term strength has been proposed, which makes it possible to properly describe the nonlinear nature of the damage accumulation.

Keywords

Main Subjects

Publisher’s Note Shahid Chamran University of Ahvaz remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. 

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Journal of Applied and Computational Mechanics

Articles in Press, Corrected Proof
Available Online from 27 May 2024